WO2016087874A1

WO2016087874A1 - Hot tub system

Info

Publication number: WO2016087874A1
Application number: PCT/GB2015/053721
Authority: WO
Inventors: Alan Graham BURR
Original assignee: Burr Alan Graham
Priority date: 2014-12-05
Filing date: 2015-12-04
Publication date: 2016-06-09
Also published as: GB2519872A; GB201421654D0; GB2519872B

Abstract

A hot tub system. The hot tub system comprises: a tub with a water feature for introducing water to the tub;a secondary container;a first fluid connection for moving water from the tub to the secondary container to drain the tub; and a second fluid connection for moving water from the secondary container to the tub, wherein the second fluid connection includes the water feature so that in use water from the secondary container can be introduced to the tub using the water feature.

Description

Hot Tub System

Field of the Invention The present invention relates to hot tub systems, and to related methods of manufacturing and use of hot tub systems.

Background to the Invention Hot tubs, also known as spa baths, whirlpools and swim spas, are large tubs of heated water used for hydrotherapy or pleasure, typically including water jet or bubble introducers for massage purposes. In contrast to a typical bathtub, a hot tub is designed to be used by one or more persons at a time and is usually located outdoors. Also, the water is not normally changed with each use, but is kept sanitary using methods similar to those used for swimming pool sanitation.

To increase energy efficiency a cover with thermal insulating properties can be placed over the water, but in order to reduce the risk of drowning it is desirable for the cover also to be child-proof and strong enough to withstand the weight of a person. Designing a cover to meet these requirements while also being inexpensive and easy to use is challenging.

Example embodiments of the present invention address this issue.

Summary of the Invention

An example embodiment provides a hot tub system comprising:

a tub with a water feature for introducing water to the tub;

a secondary container;

a first fluid connection for moving water from the tub to the secondary container to drain the tub; and

a second fluid connection for moving water from the secondary container to the tub, wherein the second fluid connection includes the water feature so that in use water from the secondary container can be introduced to the tub using the water feature. An example embodiment provides a hot tub system comprising:

a tub;

a secondary container;

wherein secondary container provides a base for the tub. Suitably, the hot tub system comprises a first fluid connection for moving water from the tub to the secondary container to drain the tub. Suitably, the hot tub system comprises a second fluid connection for moving water from the secondary container to the tub,

In one example embodiment the secondary container has a capacity at least that of the tub. In one example embodiment the secondary container has a capacity substantially equal to that of the tub.

In one example embodiment the secondary container is thermally insulated, such as comprising one or more thermally insulated wall portions, or by comprising an insulation material to provide its structure, or by having insulation material applied on or around it. In one example embodiment the secondary container is provided in a base for the tub. In one example embodiment the secondary container is provided within the footprint of the tub. In one example embodiment the secondary container conforms to the shape of an outer wall of the tub, for example an outer wall of the base of the tub. In one example embodiment the secondary container conforms to the shape of an outer wall of the tub, for example within the footprint of an outer wall of the tub. In one example embodiment a portion of the secondary container is provided above the lowermost portion of the tub. In one example embodiment the secondary container is arranged to provide structural support for the tub, for example by providing a base support, or a portion of a base support for the tub. In one example embodiment the tub is supported on the secondary container, for example being supported by the secondary container. In one example embodiment the secondary container is arranged to provide structural support for the tub, for example be reinforcing a side wall of the tub. In one example the secondary container is arranged to provide an access structure for the tub, for example a seat, a step or an arrangement of steps by which the tub can be entered.

In one example embodiment the water feature comprises a water jet. In one example embodiment the water feature comprises a water jet system. In one example embodiment the water feature comprises a waterfall, or other gravity feature. In one example embodiment, one or more water jet or gravity feature provided as part of the water feature may also in use provide a massage function, such as a water jet massage or a waterfall massage function.

In one example embodiment the first fluid connection for moving water from the tub is arranged to transfer water from the tub into the secondary container. In one example embodiment the first fluid connection for moving water from the tub is arranged to transfer water from the tub into the secondary container in order to empty the tub of water. In one example embodiment the first fluid connection for moving water from the tub to the secondary container comprises a gravity drain. In one example embodiment the first fluid connection for moving water from the tub to the secondary container comprises a pumped drain. In one example embodiment the first fluid connection comprises a plurality of openings by which water may exit the tub, for example a plurality of gravity or pumped drain openings. In one example embodiment the hot tub system comprises a power supply for the first fluid connection, such the first fluid connection is operable irrespective of the supply of mains power to the hot tub system. In one example embodiment the hot tub system comprises a fail safe arrangement for the first fluid connection, such that in the event of an abnormal operating condition the first fluid connection automatically operates. For example, in the event of a power failure for a hot tub system comprising a gravity drain, a drain valve may default to an open position to ensure immediate drainage of water from the tub into the secondary container.

In one example embodiment the hot tub system comprises a water heating unit.

In one example embodiment the first fluid connection and the second fluid connection share one or more common fluid pathways, operable to carry water in different directions according to whether the hot tub system is draining water from the tub to the secondary container, or filling the tub with water from the secondary container.

In one example embodiment the secondary container comprises a water level indicator. In one example embodiment the secondary container comprises an automatic water top up apparatus.

In one example embodiment the secondary container comprises an external drain fluid connection. In one example embodiment the secondary container comprises an inspection port.

In one example embodiment the secondary container comprises a shape complementary to a shape of the tub. In one example embodiment the secondary container comprises insulation, for example thermal insulation.

In one example embodiment the hot tub system comprises a recirculation system. In one example embodiment the secondary container comprises a recirculation system.

In one example embodiment the hot tub system comprises a window. In one example embodiment the hot tub system comprises a bleed system. In one example embodiment the hot tub system comprises a cleaning fluid container. In one example embodiment the hot tub system comprises cleaning fluid piping. In one example embodiment the hot tub system comprises a drain container. In one example embodiment the hot tub system comprises drain piping. In one example embodiment the hot tub system comprises a drain filter. In one example embodiment the hot tub system comprises a drain bleed system.

In one example embodiment the hot tub system comprises a plurality of layers of, for example, plastic in which two or more of the plurality of layers of, for example, plastic are bonded. In one example embodiment the hot tub system comprises conduits formed between the bonded layers of, for example, plastic.

In one example embodiment the hot tub system further comprises an inactivity detection system operable to raise a warning, in the event of a period of inactivity being detected in the tub. In one example embodiment the inactivity detection system is arranged to sound an alarm, in the event of a period of inactivity being detected. In one example embodiment the inactivity detection system is arranged to move water from the tub, in the event of period of inactivity being detected. In one example embodiment the inactivity detection system is arranged to empty the tub in the event of a period of inactivity being detected. In one example embodiment the inactivity detection system is arranged to move water from the tub via the first fluid connection, in the event of inactivity being detected. In one example embodiment the inactivity detection system is arranged to move water from the tub via the first fluid connection and into the secondary container, in the event of a period of inactivity being detected. In one example embodiment the hot tub system comprises a power supply arranged to maintain power to the inactivity detection system irrespective of mains power. For example, if the inactivity detection system detects a prolonged period of inactivity, consistent with the tub being vacant, the inactivity detection system may be arranged to first give a warning, then if no activity is detected to then empty water from the tub into the secondary container.

In one example embodiment the inactivity detection system comprises a drowning detection system. In one example embodiment the drowning detection system is operable to raise a warning, in the event of a potential drowning being detected. In one example embodiment the drowning detection system is arranged to sound an alarm, in the event of a potential drowning being detected. In one example embodiment the drowning detection system is arranged to move water from the tub, in the event of a potential drowning being detected. In one example embodiment the drowning detection system is arranged to empty the tub in the event of a potential drowning being detected. In one example embodiment the drowning detection system is arranged to move water from the tub via the first fluid connection, in the event of a potential drowning being detected. In one example embodiment the drowning detection system is arranged to move water from the tub via the first fluid connection and into the secondary container, in the event of a potential drowning being detected. In one example embodiment the hot tub system comprises a power supply arranged to maintain power to the drowning detection system irrespective of mains power. For example, if the drowning detection system detects a potential drowning, the drowning detection system may be arranged immediately to empty water from the tub into the secondary container.

In one example embodiment there is provided a hot tub cover, characterised by comprising no thermal insulation. In one example embodiment the cover comprises a dry hot tub cover. In one example embodiment the hot tub cover is a lightweight cover. In one example embodiment the hot tub cover has insufficient strength to support the weight of a child above a hot tub. In one example embodiment the cover is water resistant so that rain incident thereon is prevented from entering the hot tub. The hot tub cover may comprise a rigid lid, for example comprising a plastics material. The hot tub cover may comprise a flat or dome shape, and may in addition comprise an overhanging lip to extend beyond the edge of the hot tub in use. The hot tub cover may comprise a tarpaulin or other sheet of material. The hot tub cover may comprise a tent style cover, for example a tent style cover with one or more rigid support elements associated with a sheet material, and/or comprising one or more flexible support elements arranged to apply tension to the sheet material. The hot tub cover may include one or more openings, closable by Velcro, zip fastenings or the like. The hot tub cover may comprise a retractable roll of material. The hot tub cover may comprise a manually deployable cover, for example for manual unrolling across the hot tub, for example from the centre or one or more sides thereof. The hot tub cover may comprise a powered mechanism, for example arranged to pull the cover across the hot tub. The hot tub cover may comprise a powered mechanism such as a motorised roller arranged to push the cover across the hot tub. The hot tub cover may comprise inserts that in use for a dome or other raised portion to enable rain to drain from the covered area. The cover may comprise fixings, for example buttons, pop fasteners Velcro, zips or magnets, arranged to hold the cover in place by cooperating with corresponding features of a hot tub to be covered. The hot tub cover may comprise ventilation features, and/or be made at least in part of a breathable material. It is to be understood that although the hot tub cover is described as comprising no thermal insulation, there will inherently be a degree of insulation provided, albeit negligible. In an example embodiment there is provided a hot tub system and hot tub cover in combination. Suitably, the hot tub system comprises hot tub cover that is non-thermally insulating. Suitably, the hot tub system comprises a hot tub cover as described herein.

In an example embodiment there is provided a kit of parts including: a tub with a water feature for introducing water to the tub when incorporated in a hot tub system; a secondary container; a first fluid connection for moving water from the tub to the secondary container to drain the tub when incorporated in a hot tub system; and a second fluid connection for moving water from the secondary container to the tub when incorporated in a hot tub system, wherein the second fluid connection is operably coupled to the water feature so that when incorporated in a hot tub system water from the secondary container can be introduced to the tub using the water feature. Suitably, the kit of parts further includes a hot tub cover. Suitably, the hot tub cover is non-thermally insulating. Suitably, the kit comprises a hot tub cover as described herein.

In an example embodiment there is provided a method of manufacturing a hot tub system, the method comprising:

providing a tub with a water feature for introducing water to the tub; providing a secondary container;

coupling the tub to the secondary container via a first fluid connection for moving water from the tub to the secondary container to in use drain the tub; and

providing a second fluid connection for in use moving water from the secondary container to the tub, wherein the second fluid connection includes the water feature so that in use water from the secondary container can be introduced to the tub using the water feature.

In an example embodiment there is provided a method of manufacturing a hot tub system, the method comprising assembling a tub with a secondary container to provide a base for the tub. Suitably, the method comprises providing a fluid coupling between the tub and secondary container such that water may in use be drained from the tub into the secondary container. Suitably, the method comprises providing a second fluid connection such that water may in use be moved from the secondary container to the tub.

In an example embodiment there is provided a method of using a hot tub system comprising: a filled hot tub with a water feature for introducing water to the tub; and further comprising a secondary container, the method comprising:

draining water from the filled tub to the secondary container using a first fluid connection; and

moving water from the secondary container to the tub using a second fluid connection that includes a water feature so that water from the secondary container is introduced to the tub using the water feature.

Suitably, the method comprises re-filling the tub using water from the secondary container. Suitably, the method comprises the step of circulating water in the filled tub through the water feature and back to the tub. Suitably, the method comprises circulating water from the tub through the water feature while the secondary container is empty. Suitably, the water circulated from the full tub through the water feature does not passing through the secondary container. Suitably, the step of draining the water from the tub comprises emptying the tub. Suitably, the step of draining water from the tub comprises filling, such as completely filling, the secondary container. Suitably, the step of draining water from the tub comprises retaining water from the tub in the secondary container. Suitably, the step of draining water from the tub comprises retaining all of the water from the tub in the secondary container. Suitably, the method is performed using a hot tub system with features as described herein.

According to the present invention there is provided an apparatus and method as set forth in the any appended claims. Other features of the invention will be apparent from any dependent claims, and the description which follows.

Brief Introduction to the Drawings

For a better understanding of the invention, and to show how embodiments of the same may be carried into effect, reference will now be made, by way of example, to the accompanying diagrammatic drawings in which:

Figure 1 shows a schematic cross sectional view of a hot tub system according to an example embodiment, with the tub filled with water; Figure 2 shows a schematic cross sectional view of a hot tub system according to an example embodiment, with the tub emptied and the secondary container filled with water;

Figure 3 shows a schematic cross sectional view of a hot tub system according to another example embodiment, with the tub and the secondary container disassembled;

Figure 4 shows a schematic cross sectional view of a hot tub system according to yet another example embodiment, with the tub and the secondary container disassembled;

Figure 5 shows a schematic cross sectional view of the hot tub system according to the example embodiment of Figure 4, with the tub and the secondary container assembled;

Figure 6 shows a method of using a hot tub system according to an example embodiment; and Figure 7 shows a method of washing a hot tub system according to an example embodiment.

Unless otherwise inconsistent, like reference numerals are used to illustrate corresponding integers in the accompanying drawings. Description of Example Embodiments

Figures 1 and 2 show a hot tub system 1 according to an example embodiment. The hot tub system 1 comprises a hot tub 10 and a secondary container 20. The tub 10 is provided with a water feature 12 for introducing water to the tub 10. The water feature 12 comprises a water jet that can circulate water W from the tub 10 back into the tub 10 under pressure so as to provide a massage feature for the hot tub system 10. The secondary container 20 is an insulated tank provided below the tub 10.

A first fluid connection 1 1 for moving water from the tub to the secondary container to drain the tub is provided. Figure 2 shows water W filling the secondary container 20 while the tub 10 is empty. A second fluid connection 22 for moving water W from the secondary container 20 to the tub 10 is provided. The second fluid connection 22 includes the water feature 12 so that water W from the secondary container 20 can be introduced to the tub 10 using the water feature 12. The second fluid connection 22 can be integrated with the ordinary pumps etc. that are included in a cleaning/filtration unit 30 provided in the hot tub system 1 . A water heating unit (not shown) may also be provided in the hot tub system 1 . In this way the hot tub system 1 can be used as follows. After bathers have got out of the tub 10, water W is drained out of the tub 10 via the first fluid connection 1 1 and into the secondary container 20 until the tub 10 is emptied of water W. This construction and operation has a number of advantages. Firstly, the tub 10 can be left empty, meaning that the drowning risk posed by the tub 10 is eliminated, along with the need for a strong, child resistant cover, fence etc. Secondly, the secondary container 20 can be effectively insulated, with insulation material 21 shown in Figures 1 and 2. This means that heat loss from the water W is reduced for the time the hot tub system 1 is not in use by bathers. The second fluid connection 22 provides an effective way of re-filling the tub using water W from the secondary container 20, by using the capacity of the water feature 12 to move the water W without the need for additional pumps etc.

In the example embodiment shown the secondary container 20 has a capacity substantially equal to that of the tub 10 at its normal operating fill level, meaning that when the tub 10 is emptied the secondary container 20 is completely filled. This helps to eliminate airspace in the container 20, to reduce heat transfer. An additional water supply (not shown) may be provided for the secondary container 20. Such an additional water supply may be useful in topping up the secondary container 20 so that the secondary container 20 is completely filled with water in use. Such an additional water supply may also be useful in providing water into the secondary container 20 for movement on to the tub 10 via the second fluid connection 22 when the tub 10 is being filled. The secondary container 20 may further comprise a water level indicator. Further, the secondary container 20 may comprise an apparatus configured to automatically top up the secondary container 20 with water from the additional water supply so that the secondary container 20 is completely filled with water. An additional fluid connection (not shown) may be provided for the secondary container 20, to discharge water from the secondary container 20 to an external water drain (not shown). In this way water in the secondary container 20 may be discharged.

In the example embodiment shown the secondary container 20 is provided as a base for the tub 10, within the footprint of the tub 10. The secondary container 20 conforms to the shape of the outer wall of the tub 10. The tub 10 is suitable for five bathers, and has a 1468 litre water capacity. The volume is contained in the tub 10, within its exterior dimensions of 2.25 m by 2.25 m by 0.92 m depth. A secondary container 20 of height 0.29 m (not including thermal insulation/wall dimensions) would be sufficient to contain the vacated water. By providing the secondary container 20 below the tub 10 there is increased resilience for the hot tub system 1 and less impact on the tub 10 from proximity to the ground. The secondary container 20 need not have an aesthetically pleasing, user-facing aspect, and can thus be made more resistant to damp, contamination, rodent attack, or impacts that are all more likely at the lower portion of the hot tub system 1 . One or more inspection ports (not shown) may be provided to the secondary container 20 allowing water in the secondary container 20, or the secondary container 20 itself to be inspected, tested or treated.

In the example embodiment shown a portion of the secondary container 20 is provided above the lowermost portion of the tub 10. The complementary nature of the two components add to the strength and stability of the hot tub system 1 .

The secondary container 20 may be provided with a shape that is complementary to the shape of the tub 10, without obscuring drains and/or pipes, such that thermal insulation may be placed between the secondary container 20 and the tub 10. In this way, the tub 10 may be insulated in use. The secondary container 20 may also be insulated at portions away from the tub 10, to reduce heat lost from the hot tub system when the water W is transferred from the tub 10 to the secondary container 20, and is not in use by bathers. The secondary container 20 may be fully, or in part of a shape to mate and/or conform to that of the tub in other embodiments, for example around a majority of the periphery of the tub, to account for the provision of connections, access etc. in the non complementary part(s).

The hot tub system 1 may be provided with a recirculation system (not shown), to pump and/or aerate the water W. The secondary container 20 may be provided with the recirculation system. In this way, stagnation of the water W in the secondary container 20 may be minimised.

The hot tub system of example embodiments may comprise a window and/or a transparent material below the tub 10 such that the fluid paths may be inspected for maintenance and/or fault diagnosis. The window and/or transparent material may be arranged so as not to be visible from the position of a bather in the tub.

The first fluid connection 1 1 of the embodiment shown is arranged to transfer water W from the tub 10 into the secondary container 20 primarily under gravity. The first fluid connection 1 1 suitably comprises two large bore drains, each with a grate/filter, and supplemented by a motorised pump. The hot tub system 1 comprises a fail safe arrangement for the first fluid connection 1 1 , such that in the event of an abnormal operating condition the first fluid connection 1 1 automatically operates to empty the tub 10. The fail safe arrangement is provided as part of an inactivity detection system/drowning detection system (not shown).

Removal of water from the tub 10 when the hot tub system 1 is not in use has a number of further advantages. For example, bathers can stay in the tub 10 to towel off in relative shelter, and the emptied tub can be cleaned easily. Yet another fluid connection (not shown) may be provided for the tub 10, to discharge water from the tub 10 to an external water drain (not shown).

A bleed system (not shown) may be provided for the hot tub system 1 , whereby after use of the tub 10 and/or on transferring water W from the tub 10 into the secondary container 20, water in one or more of the water feature 12, the first fluid connection 1 1 , the second fluid connection 22, the cleaning/filtration unit 30 may be transferred into the secondary container 20.

An additional container (not shown), for example a cleaning fluid container, may be provided for the hot tub system 1 for, for example, cleaning fluid. The cleaning fluid container may be provided with means for access, for example, to refill the cleaning fluid container with cleaning fluid. The hot tub system 1 may be provided with piping, for example, cleaning fluid piping (not shown) for, for example, cleaning fluid. The cleaning fluid piping may be fluid communication with one or more of: the tub 10, the secondary container 20, the water feature 12, the first fluid connection 1 1 , the second fluid connection 22, the cleaning/filtration unit 30, the cleaning fluid container.

Another additional container (not shown), for example a drain container, may be provided for the hot tub system 1 for, for example, used cleaning fluid. The drain container may be provided with means for access, for example, to remove and/or empty the drain container of used cleaning fluid. The hot tub system 1 may be provided with piping, for example, used cleaning fluid piping (not shown) for, for example, used cleaning fluid. The used cleaning fluid piping may be fluid communication with one or more of: the tub 10, the secondary container 20, the water feature 12, the first fluid connection 1 1 , the second fluid connection 22, the cleaning/filtration unit 30, the cleaning fluid container, the used cleaning fluid container, the cleaning fluid piping.

A drain filter (not shown) may be provided for the hot tub system 1 , to capture residue, solids and/or grime in the water W. The drain filter may be provided to, for example, the cleaning/filtration unit 30. The drain filter may be provided with means for access, for example, to replace and/or rinse the drain filter after the water W has been transferred from the tub 10 to the secondary container 20. A drain bleed system (not shown) may be provided for the hot tub system 1 , to allow water and/or residue to drain into the drain container from one or more of the tub 10, the secondary container 20, the water feature 12, the first fluid connection 1 1 , the second fluid connection 22, the cleaning/filtration unit 30, the cleaning fluid container, the used cleaning fluid container, the cleaning fluid piping, pipework of the hot tub system 1 .

Removal of water from the tub 10 and removal of water from the secondary container 20 when the hot tub system 1 is not in use has a further advantage, allowing the tub 10 and/or secondary container 20 to be moved and allowing maintenance of the tub 10 and/or secondary container 20. For example, when the water is changed and thus there is no water in either the tub 10 or secondary container 20, the secondary container 20 may be sufficiently light in weight to be moved, for example to expose the underside of the tub 10 for maintenance.

Hot tubs are typically manufactured in plastic, such as acrylic, and have numerous pipes connecting jets with valves, pumps, ozonisers or ozonators, ultraviolet treatment, drains etc. Modern methods of plastics manufacture, such as acrylic bonding (thermal, solvent, etc.), allow two or more layers of plastic to be connected together and further allow manufacture of a robust integrated piping system, which is tolerant to the pressure exerted by water or air jets used in hot tubs, and which has exterior connectors to the jets, pumps, valves, sanitary systems and drains. Additionally and/or alternatively, the hot tub system 1 may be manufactured to integrate one or more of the tub 10, the secondary container 20, the water feature 12, the first fluid connection 1 1 , the second fluid connection 22, the cleaning/filtration unit 30, the cleaning fluid container, the used cleaning fluid container, the cleaning fluid piping. In this way, the number and/or length and/or complexity of manually-fitted pipe may be reduced. The volume and space available for the secondary container 20 may be increased and conformance/fit of the secondary container 20 and the tub 10 may be improved.

Figure 3 shows a schematic cross sectional view of a hot tub system 1 ' according to another example embodiment, with the tub 10' and the secondary container 20' disassembled. Tub 10' comprises a plurality of water features 12' and a plurality of first fluid connections 1 1 a'. Secondary container 20' comprises insulation 21 a', arranged such that the insulation 21 a' is external to secondary container 20'. Alternatively and/or additionally, insulation 21 a' may be arranged such that the insulation 21 a' is internal to and/or integrated with secondary container 20', Secondary container 20' further comprises an external drain 24'. Secondary container 20' further comprises a secondary container lid 23', arranged to conform and/or be compatible with and/or mate and/or mirror the shape of tub 10', Secondary container lid 23' further comprises insulation 21 b' arranged such that the insulation 21 b' is internal to the secondary container 20' when the hot tub system V is assembled. Alternatively and/or additionally, insulation 21 b' may be arranged such that the insulation 21 b' is external to and/or integrated with secondary container 20' and/or secondary container lid 23', Secondary container lid 23' further comprises routed conduits arranged in fluid communication with the water features 12' in the tub 10', when the hot tub system V is assembled. Secondary container lid 23' may further comprise routed conduits for water and/or air and/or electrical cables for example routing for lighting. Secondary container 20' further comprises a plurality of first fluid connection 1 1 b' arranged in fluid communication with the first fluid connections 1 1 a' in the tub 10', when the hot tub system 1 ' is assembled. In this way, the first fluid connection 1 1 a', 1 1 b' of the embodiment shown is arranged to transfer water W from the tub 10' into the secondary container 20' primarily under gravity.

Tub 10' is in this example embodiment formed according to manufacturing methods known in the art using a tub mould. Secondary container lid 23' may be formed similarly to tub 10', using the tub mould and/or a compatible tub mould, from thicker plastic (for example, transparent acrylic) or may be selectively thicker in conduit areas. Conduits may be formed, for example routed, into the upper side of the secondary container lid 23' to form grooved contours. Water features 12', for example holes for jets, lights etc, may be formed for example drilled into tub 10'.

To assemble the hot tub system 1 ', tub 10' may be bonded to secondary container lid 23', for example, chemically and/or thermally and/or mechanically. In this way, the tub 10' and secondary container lid 23' with insulation 21 b' comprise a bonded structure when assembled, such that the tub 10' and secondary container lid 23' share insulation 21 b'. In this way, conduits, for example D-shaped or circular conduits, are formed in the bonded structure. In this way, holes for supports or access to the hot tub system 1 ' may perforate the secondary container 20' or internal supports within the secondary container 20'.

To assemble the hot tub system 1 ', secondary container lid 23' may be arranged with secondary container 20', for example secondary container lid 23' may be arranged on and/or in secondary container 20'. In this way, the secondary container 20' may be moved relative to the secondary container lid 23' such that access for inspection and/or maintenance may be provided. For example, empty secondary container 20' may be lowered to allow exposure to transparent piping and observation of hot tub system 1 ' in use. For example, empty tub 10' may be raised, leaving secondary container 20' in situ, allow access for inspection and/or maintenance.

Additionally and/or alternatively, secondary container 20' may comprise a plurality of secondary containers 20', for example two secondary containers in which a secondary container is in direct fluid communication with a first fluid connection 1 1 a', 1 1 b'. A highest point of a secondary container 20' may be arranged below a lowest point of tub 10' such that water W may drain from tub 10' to secondary containers 20' under gravity.

Figures 4 and 5 show schematic cross sectional views of a hot tub system 1 " according to yet another example embodiment. Figure 4 shows the tub 10" and the secondary container 20" disassembled. Figure 5 shows the tub 10" and the secondary container 20" assembled. Tub 10" comprises a plurality of water features 12" and a plurality of first fluid connections 1 1 a". Secondary container 20" comprises insulation 21 a", arranged such that the insulation 21 a" is external to secondary container 20". Alternatively and/or additionally, insulation 21 a" may be arranged such that the insulation 21 a" is internal to and/or integrated with secondary container 20", Secondary container 20" further comprises an external drain 24". Secondary container 20" further comprises a secondary container lid 23". Secondary container lid 23" further comprises insulation 21 b" arranged such that the insulation 21 b" is internal to the secondary container 20" when the hot tub system 1 " is assembled. Alternatively and/or additionally, insulation 21 b" may be arranged such that the insulation 21 b" is external to and/or integrated with secondary container 20" and/or secondary container lid 23", Secondary container lid 23" further comprises routed conduits arranged in fluid communication with the water features 12" in the tub 10", when the hot tub system 1 " is assembled. Secondary container 20" further comprises a plurality of first fluid connection 1 1 b" arranged in fluid communication with the first fluid connections 1 1 a" in the tub 10", when the hot tub system 1 " is assembled. In this way, the first fluid connection 1 1 a", 1 1 b" of the embodiment shown is arranged to transfer water W from the tub 10" into the secondary container 20" primarily under pumping. To assemble the hot tub system 1 ", tub 10" may be bonded to secondary container lid 23", for example, chemically and/or thermally and/or mechanically. To assemble the hot tub system 1 ", secondary container lid 23" may be arranged with secondary container 20", for example secondary container lid 23" may be arranged on and/or in secondary container 20".

Figure 6 shows a method of using a hot tub system 1 according to an example embodiment. At step S100, water W is drained from the filled tub 10 to the secondary container 20 using the first fluid connection 1 1 . At step S200, water W is moved from the secondary container 20 to the tub 10 using a second fluid connection 22 that includes a water feature 12 so that water W from the secondary container 20 is introduced to the tub 10 using the water feature 12. Optionally, the method of using the hot tub system 1 comprises re-filling the tub using water from the secondary container.

Figure 7 shows a method of washing and/or cleaning a hot tub system 1 according to an example embodiment. At step S10, cleaning fluid from the cleaning fluid container is pumped through the water feature 12 and/or cleaning filtration unit 30 and/or the tub 10 and/or the secondary container 20 and/or the first fluid connection 1 1 , and/or the second fluid connection 22. Step S10 may be repeated 1 or more times. At step S20, the cleaning fluid is discharged and/or drained into the drain container. At step S30, a quantity of water, for example rinsing water, from the additional water supply is rinsed through the water feature 12 and/or cleaning filtration unit 30 and/or the tub 10 and/or the secondary container 20 and/or the first fluid connection 1 1 , and/or the second fluid connection 22. At step S40, the rinsing water is discharged and/or drained into the drain container. Optionally, the method of washing and/or cleaning the hot tub system 1 comprises the step of bleeding water and/or cleaning fluid into the drain container from one or more of the water feature 12 and/or cleaning filtration unit 30 and/or the tub 10 and/or the secondary container 20 and/or the first fluid connection 1 1 , and/or the second fluid connection 22. Optionally, the method of washing and/or cleaning the hot tub system 1 comprises the step of emptying the drain container. Optionally, the method of washing and/or cleaning the hot tub system 1 comprises the step of physically cleaning, for example manually wiping, the hot tub system 1 . It has been further appreciated that since water can be readily removed from the tub 1 to allow the tub 1 to rest empty between uses, an alternative configuration of hot tub cover can be provided. Figure 2 shows a hot tub cover 40 that comprises no thermal insulation. That is to say, although the hot tub cover 40 will inherently provide some thermal insulation, there is a negligible insulating effect provided thereby, with no specific design considerations or additional material or features provided in order to try to keep heat in the tub 10. The cover 40 is to be thought of as a dry hot tub cover, being cheap, lightweight, convenient to use, but with insufficient strength to support the weight of a child above the tub 10 since there is no associated drowning risk posed by the empty tub 10. The cover 40 is water resistant so that rain incident thereon is prevented from entering the tub 10. The features described herein are suitable for inclusion in a hot tub system 1 at time of first manufacture, or can be retrofitted to existing hot tub systems in situ as appropriate. Although a few preferred embodiments have been shown and described, it will be appreciated by those skilled in the art that various changes and modifications might be made without departing from the scope of the invention, as defined in any appended claims.

Attention is directed to all papers and documents which are filed concurrently with or previous to this specification in connection with this application and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference.

All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive.

Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features. The invention is not restricted to the details of the foregoing embodiment(s). The invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.

Claims

Claims:

1 . A hot tub system comprising:

a tub with a water feature for introducing water to the tub;

a secondary container;

a second fluid connection for moving water from the secondary container to the tub, wherein the second fluid connection includes the water feature so that in use water from the secondary container can be introduced to the tub using the water feature.

2. A hot tub system according to claim 1 , wherein the secondary container provides a base for the tub.

3. A hot tub system according to any preceding claim, wherein the secondary container has a capacity at least that of the tub.

4. A hot tub system according to any preceding claim, wherein the secondary container is thermally insulated.

5. A hot tub system according to any preceding claim, wherein the secondary container conforms to a shape of an outer wall of the tub.

6. A hot tub system according to any preceding claim, wherein a portion of the secondary container is one of: provided above the lowermost portion of the tub, arranged to provide an access structure for the tub.

7. A hot tub system according to any preceding claim, wherein the water feature comprises one of: a water jet, a water jet system, a waterfall, a gravity water feature, a massage function.

8. A hot tub system according to any preceding claim, wherein the first fluid connection for moving water from the tub to the secondary container comprises one of: a gravity drain, a pumped drain.

9. A hot tub system according to any preceding claim, wherein the hot tub system comprises a fail safe arrangement for the first fluid connection, such that in the event of an abnormal operating condition the first fluid connection automatically operates.

10. A hot tub system according to any preceding claim, wherein the first fluid connection and the second fluid connection share one or more common fluid pathways, operable to carry water in different directions according to whether the hot tub system is draining water from the tub to the secondary container, or filling the tub with water from the secondary container.

1 1 . A hot tub system according to any preceding claim, further comprising a bleed system.

12. A hot tub system according to any preceding claim, wherein the tub comprises a plurality of layers in which two or more of the plurality of layers are bonded.

13. A hot tub system according to any previous claim, wherein the hot tub system comprises an inactivity detection system operable to raise a warning, in the event of a period of inactivity being detected in the tub.

14. A hot tub system according to claim 13, wherein the inactivity detection system is arranged to move water from the tub via the first fluid connection, in the event of inactivity being detected.

15. A hot tub system according to any previous claim, wherein the hot tub system comprises non-thermally insulated hot tub cover.

16. A kit of parts including: a tub with a water feature for introducing water to the tub when incorporated in a hot tub system; a secondary container; a first fluid connection for moving water from the tub to the secondary container to drain the tub when incorporated in a hot tub system; and a second fluid connection for moving water from the secondary container to the tub when incorporated in a hot tub system, wherein the second fluid connection is operably coupled to the water feature so that when incorporated in a hot tub system water from the secondary container can be introduced to the tub using the water feature.

17. A method of manufacturing a hot tub system, the method comprising:

18. A method of manufacturing a hot tub system according to claim 17, wherein the method comprises assembling a tub with a secondary container to provide a base for the tub.

19. A method of using a hot tub system comprising: a filled hot tub with a water feature for introducing water to the tub; and further comprising a secondary container, the method comprising:

20. A method of using a hot tub system according to claim 19, wherein the method comprises re-filling the tub using water from the secondary container.

21 . A hot tub system substantially as described and shown in the accompanying drawings.

22. A kit of parts for a hot tub system, the hot tub system as substantially as described and shown in the accompanying drawings.

23. A method of manufacturing a hot tub system, the hot tub system substantially as described and shown in the accompanying drawings.

24. A method of using a hot tub system, the hot tub system substantially as described and shown in the accompanying drawings.

25. A hot tub system as described with respect to the accompanying drawings.

26. A kit of parts for a hot tub system, the hot tub system as described with respect to the accompanying drawings.

27. A method of manufacturing a hot tub system, the hot tub system as described with respect to the accompanying drawings.

28. A method of using a hot tub system, the hot tub system as described with respect to the accompanying drawings.