WO2015044793A1 - An electrical heating device - Google Patents

An electrical heating device Download PDF

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Publication number
WO2015044793A1
WO2015044793A1 PCT/IB2014/058151 IB2014058151W WO2015044793A1 WO 2015044793 A1 WO2015044793 A1 WO 2015044793A1 IB 2014058151 W IB2014058151 W IB 2014058151W WO 2015044793 A1 WO2015044793 A1 WO 2015044793A1
Authority
WO
WIPO (PCT)
Prior art keywords
heating
power supply
heating device
connection terminals
mounting formation
Prior art date
Application number
PCT/IB2014/058151
Other languages
French (fr)
Inventor
Thomas LOMBARD
Izak Johannes VAN WYK
Original Assignee
Lombard Thomas
Van Wyk Izak Johannes
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lombard Thomas, Van Wyk Izak Johannes filed Critical Lombard Thomas
Publication of WO2015044793A1 publication Critical patent/WO2015044793A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/18—Water-storage heaters
    • F24H1/20—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes
    • F24H1/201—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes using electric energy supply
    • F24H1/202—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes using electric energy supply with resistances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1818—Arrangement or mounting of electric heating means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/78—Heating arrangements specially adapted for immersion heating
    • H05B3/82—Fixedly-mounted immersion heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/02—Photovoltaic energy

Definitions

  • This invention relates to electrical heating elements and in particular to a resistive electrical heating device which is retrofittable to a heating apparatus and in particular to a geyser for heating water.
  • an electrical heating device for a heating apparatus which includes:
  • a mounting formation for removably mounting the heating device to the heating apparatus
  • a first heating element which is connected to the mounting formation and which includes a first pair of electrical connection terminals which are connectable to a first power supply;
  • a second heating element which is connected to the mounting formation and which includes a second pair of electrical connection terminals which are connectable to a second power supply, independent of the first power supply, wherein the first and second heating elements are electrically insulated from each other in a configuration in which the first and second power supplies are simultaneously connectable to the respective heating elements.
  • the heating device may further include a first elongate sleeve which is connected to the mounting formation for receiving a first thermostat.
  • the heating device may further include a second elongate sleeve which is connected to the mounting formation for receiving a second thermostat, the second sleeve being spaced from the first.
  • the first and second heating elements may differ in length, may be parallel and may be arranged in crisscross fashion, the longer element crossing over the shorter element.
  • the mounting formation may comprise an externally screw-threaded attachment portion and a hexagonal head having a greater diameter than the attachment portion.
  • the heating elements may pass through the mounting formation such that the respective pairs of electrical connection terminals are arranged on one side of the mounting formation and protrude from the head.
  • the first and second heating elements may be tubular, sheathed resistive heating elements.
  • the heating apparatus may be in the form of a geyser for heating water.
  • a method of retrofitting a retrofittable electrical heating device to a geyser including:
  • a mounting formation for removably mounting the heating device to the geyser
  • a first heating element which is connected to the mounting formation and which includes a first pair of electrical connection terminals which are connectable to a first power supply;
  • a second heating element which is connected to the mounting formation and which includes a second pair of electrical connection terminals which are connectable to a second power supply, independent of the first power supply, wherein the first and second heating elements are electrically insulated from each other in a configuration in which the first and second power supplies are simultaneously connectable to the respective heating elements, the method including: disconnecting and removing an existing electrical heating element from the geyser;
  • the retrofittable heating device may be a heating device as described above.
  • the invention further extends to a method of retrofitting a retrofittable electrical heating device to an electrical heating apparatus having an existing heating element, the retrofittable electrical heating device including:
  • a mounting formation for removably mounting the heating device to the heating apparatus
  • a first heating element which is connected to the mounting formation and which includes a first pair of electrical connection terminals which are connectable to a first power supply;
  • a second heating element which is connected to the mounting formation and which includes a second pair of electrical connection terminals which are connectable to a second power supply, independent of the first power supply, wherein the first and second heating elements are electrically insulated from each other in a configuration in which the first and second power supplies are simultaneously connectable to the respective heating elements, the method including:
  • retrofitting the retrofittable heating device to the heating apparatus and connecting the first power supply to the first pair of connection terminals and connecting the second power supply to the second pair of connection terminals of the retrofittable heating device.
  • installation which includes:
  • a second power supply independent of the first power supply, wherein the first power supply is connected to the first heating element of the heating device and the second power supply is connected to the second heating element.
  • the first power supply may be a mains power supply.
  • the second power supply may be a photovoltaic power supply.
  • Figure 1 illustrates a side view of an electrical heating device in accordance with the invention
  • Figure 2 illustrates a further side view of the heating device of figure 1 ;
  • Figure 3 illustrates an end view of the heating device of figure 1 showing electrical connection terminals
  • Figure 4 shows a further end view of the heating device, opposite to the end view illustrated in figure 3.
  • reference numeral 10 refers generally to an electrical heating device for a heating apparatus, more particularly for a geyser (not shown).
  • the heating device 10 includes a mounting formation 12 for removably mounting the heating device 10 to a geyser, a first elongate resistive heating element 14.1 which is connected to the mounting formation 12, a second elongate resistive heating element 14.2 which is also connected to the mounting formation 12 and a pair of spaced apart, parallel elongate sleeves 16, each of which extends through the mounting formation 12 and is configured to receive a thermostat (not shown) therein. Accordingly, the heating device 10 has dual heating elements 14, each of which are connectable to an independent power supply. This makes the heating device 10 versatile and easily retrofittable to existing heating apparatus and in particular to existing conventional geysers which operate primarily using mains power.
  • the mounting formation 12 comprises an externally screw-threaded attachment portion 17 and a hexagonal head 18, having a greater diameter than the attachment portion 17.
  • the screw thread on the attachment portion 17 is not illustrated in the drawings.
  • each elongate heating element 14 terminates in a pair of electrical connection terminals 20 which are connectable to a power source in conventional fashion using electrical wires. Accordingly, the first heating element 14.1 terminates in a pair of first electrical connection terminals 20.1 and the second heating element 14.2 terminates in a pair of second electrical connection terminals 20.2.
  • the respective connection terminals 20 of each heating element 14 extend through holes in the mounting formation 12 such that the terminals 20 are provided on the same side of the mounting formation 12 and protrude from the hexagonal head 18 together with open ends of the sleeves 16 (refer to figure 3). From an opposite side of the mounting formation 12, a remainder of the heating elements 14 project away from the attachment portion 17 (see figures 1 and 2).
  • the heating elements 14 differ in length and are parallel when viewed from the side, the longer first heating element 14.1 crossing over the shorter second heating element 14.2. This can be seen more clearly with reference to figure 4.
  • the longer first heating element 14.1 is configured to be connected to a photovoltaic power supply, such as for example one or more solar panels or other direct current power supplies.
  • the length of the element 14.1 impacts upon its resistance and hence upon the amount of power dissipated when current is applied thereto.
  • the element 14.1 is rated at 900 Watts.
  • the shorter second heating element 14.2 is configured to be connected to a mains power supply, i.e. alternating current.
  • a 220 Volt supply the element is rated at 2000 Watts.
  • the heating elements 14 are conventional tubular sheathed resistive heating elements.
  • the heating device 10 further has two sleeves 16 to accommodate two separate thermostats (not shown), one associated with each heating element 14.1 , 14.2.
  • the advantage of the heating device 10 in accordance with the invention is that it is easily retrofittable to existing conventional geysers because the mounting formation 12 is identical to those of standardised geyser heating elements.
  • the application of the heating device 10 is specific to geysers, the scope of the invention is naturally not limited to water heating apparatus such as geysers and extends to any suitable electrical heating apparatus making use of only mains power prior to modification.
  • the heating device 10 in accordance with the invention provides a simple way of marrying mains power with alternative forms of energy such as photovoltaic power supplies without having to make difficult and costly modifications to existing heating apparatus.
  • the only modification that is required in order to convert a conventional geyser into a hybrid powered geyser is to remove the existing heating element from the conventional geyser and to replace it with the heating element 10 in accordance with the invention.
  • a user having the heating device 10 mounted to his conventional geyser can switch between mains power and photovoltaic power as he/she wishes by switching the independent circuits on and off.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)

Abstract

This invention relates to an electrical heating device 10 and to an installation including such a device 10. The heating device 10 is for use in a heating apparatus, for e.g. a geyser and includes: a mounting formation 12 for removably mounting the device 10 to the geyser; a first heating element 14.1 which is connected to the mounting formation 12 and which includes a first pair of electrical connection terminals 20.1 which are connectable to a first power supply; and a second heating element 14.2 which includes a second pair of electrical connection terminals 20.2 which are connectable to a second power supply, independent of the first power supply. The first and second heating elements 14 are electrically insulated from each other in a configuration in which the first and second power supplies are simultaneously connectable to the respective heating elements 14.

Description

An electrical heating device
FIELD OF INVENTION
This invention relates to electrical heating elements and in particular to a resistive electrical heating device which is retrofittable to a heating apparatus and in particular to a geyser for heating water.
SUMMARY OF INVENTION
According to a first aspect of the invention, there is provided an electrical heating device for a heating apparatus which includes:
a mounting formation for removably mounting the heating device to the heating apparatus;
a first heating element which is connected to the mounting formation and which includes a first pair of electrical connection terminals which are connectable to a first power supply; and
a second heating element which is connected to the mounting formation and which includes a second pair of electrical connection terminals which are connectable to a second power supply, independent of the first power supply, wherein the first and second heating elements are electrically insulated from each other in a configuration in which the first and second power supplies are simultaneously connectable to the respective heating elements.
The heating device may further include a first elongate sleeve which is connected to the mounting formation for receiving a first thermostat.
The heating device may further include a second elongate sleeve which is connected to the mounting formation for receiving a second thermostat, the second sleeve being spaced from the first. The first and second heating elements may differ in length, may be parallel and may be arranged in crisscross fashion, the longer element crossing over the shorter element.
The mounting formation may comprise an externally screw-threaded attachment portion and a hexagonal head having a greater diameter than the attachment portion. The heating elements may pass through the mounting formation such that the respective pairs of electrical connection terminals are arranged on one side of the mounting formation and protrude from the head.
The first and second heating elements may be tubular, sheathed resistive heating elements.
The heating apparatus may be in the form of a geyser for heating water.
In accordance with a further aspect of the invention there is provided a method of retrofitting a retrofittable electrical heating device to a geyser, the retrofittable electrical heating device including:
a mounting formation for removably mounting the heating device to the geyser;
a first heating element which is connected to the mounting formation and which includes a first pair of electrical connection terminals which are connectable to a first power supply; and
a second heating element which is connected to the mounting formation and which includes a second pair of electrical connection terminals which are connectable to a second power supply, independent of the first power supply, wherein the first and second heating elements are electrically insulated from each other in a configuration in which the first and second power supplies are simultaneously connectable to the respective heating elements, the method including: disconnecting and removing an existing electrical heating element from the geyser;
retrofitting the retrofittable heating device to the geyser; and
connecting the first power supply to the first pair of connection terminals and connecting the second power supply to the second pair of connection terminals.
The retrofittable heating device may be a heating device as described above. The invention further extends to a method of retrofitting a retrofittable electrical heating device to an electrical heating apparatus having an existing heating element, the retrofittable electrical heating device including:
a mounting formation for removably mounting the heating device to the heating apparatus;
a first heating element which is connected to the mounting formation and which includes a first pair of electrical connection terminals which are connectable to a first power supply; and
a second heating element which is connected to the mounting formation and which includes a second pair of electrical connection terminals which are connectable to a second power supply, independent of the first power supply, wherein the first and second heating elements are electrically insulated from each other in a configuration in which the first and second power supplies are simultaneously connectable to the respective heating elements, the method including:
disconnecting and removing the existing electrical heating element from the heating apparatus;
retrofitting the retrofittable heating device to the heating apparatus; and connecting the first power supply to the first pair of connection terminals and connecting the second power supply to the second pair of connection terminals of the retrofittable heating device.
In accordance with yet another aspect of the invention, there is provided installation which includes:
a heating apparatus; an electrical heating device as claimed in any of claims 1 to 8 inclusive, mounted to the heating apparatus;
a first power supply; and
a second power supply, independent of the first power supply, wherein the first power supply is connected to the first heating element of the heating device and the second power supply is connected to the second heating element.
The first power supply may be a mains power supply.
The second power supply may be a photovoltaic power supply.
BRIEF DESCRIPTION OF DRAWINGS The invention will now be further described, by way of example, with reference to the accompanying diagrammatic drawings.
In the drawings:
Figure 1 illustrates a side view of an electrical heating device in accordance with the invention;
Figure 2 illustrates a further side view of the heating device of figure 1 ;
Figure 3 illustrates an end view of the heating device of figure 1 showing electrical connection terminals; and
Figure 4 shows a further end view of the heating device, opposite to the end view illustrated in figure 3.
DETAILED DESCRIPTION OF AN EXAMPLE EMBODIMENT
In the figures, reference numeral 10 refers generally to an electrical heating device for a heating apparatus, more particularly for a geyser (not shown).
The heating device 10 includes a mounting formation 12 for removably mounting the heating device 10 to a geyser, a first elongate resistive heating element 14.1 which is connected to the mounting formation 12, a second elongate resistive heating element 14.2 which is also connected to the mounting formation 12 and a pair of spaced apart, parallel elongate sleeves 16, each of which extends through the mounting formation 12 and is configured to receive a thermostat (not shown) therein. Accordingly, the heating device 10 has dual heating elements 14, each of which are connectable to an independent power supply. This makes the heating device 10 versatile and easily retrofittable to existing heating apparatus and in particular to existing conventional geysers which operate primarily using mains power.
The mounting formation 12 comprises an externally screw-threaded attachment portion 17 and a hexagonal head 18, having a greater diameter than the attachment portion 17. The screw thread on the attachment portion 17 is not illustrated in the drawings.
Opposing ends of each elongate heating element 14 terminate in a pair of electrical connection terminals 20 which are connectable to a power source in conventional fashion using electrical wires. Accordingly, the first heating element 14.1 terminates in a pair of first electrical connection terminals 20.1 and the second heating element 14.2 terminates in a pair of second electrical connection terminals 20.2. The respective connection terminals 20 of each heating element 14 extend through holes in the mounting formation 12 such that the terminals 20 are provided on the same side of the mounting formation 12 and protrude from the hexagonal head 18 together with open ends of the sleeves 16 (refer to figure 3). From an opposite side of the mounting formation 12, a remainder of the heating elements 14 project away from the attachment portion 17 (see figures 1 and 2). The heating elements 14 differ in length and are parallel when viewed from the side, the longer first heating element 14.1 crossing over the shorter second heating element 14.2. This can be seen more clearly with reference to figure 4.
The longer first heating element 14.1 is configured to be connected to a photovoltaic power supply, such as for example one or more solar panels or other direct current power supplies. The length of the element 14.1 impacts upon its resistance and hence upon the amount of power dissipated when current is applied thereto. For a 48 Volt supply the element 14.1 is rated at 900 Watts. The shorter second heating element 14.2, on the other hand, is configured to be connected to a mains power supply, i.e. alternating current. For a 220 Volt supply the element is rated at 2000 Watts. The heating elements 14 are conventional tubular sheathed resistive heating elements. The heating device 10 further has two sleeves 16 to accommodate two separate thermostats (not shown), one associated with each heating element 14.1 , 14.2.
The advantage of the heating device 10 in accordance with the invention is that it is easily retrofittable to existing conventional geysers because the mounting formation 12 is identical to those of standardised geyser heating elements. Although, in this example embodiment, the application of the heating device 10 is specific to geysers, the scope of the invention is naturally not limited to water heating apparatus such as geysers and extends to any suitable electrical heating apparatus making use of only mains power prior to modification.
By introducing two heating elements 14.1 , 14.2 to the heating device 10 in accordance with the present invention, one element 14.2 being connected or connectable to mains power and the other element 14.1 being connected or connectable to photovoltaic power, the Inventors believe that the heating device 10 in accordance with the invention provides a simple way of marrying mains power with alternative forms of energy such as photovoltaic power supplies without having to make difficult and costly modifications to existing heating apparatus. In fact, apart from supplying and installing a photovoltaic power supply, the only modification that is required in order to convert a conventional geyser into a hybrid powered geyser is to remove the existing heating element from the conventional geyser and to replace it with the heating element 10 in accordance with the invention. In other words, a user having the heating device 10 mounted to his conventional geyser can switch between mains power and photovoltaic power as he/she wishes by switching the independent circuits on and off.

Claims

1 . An electrical heating device for a heating apparatus which includes: a mounting formation for removably mounting the heating device to the heating apparatus;
a first heating element which is connected to the mounting formation and which includes a first pair of electrical connection terminals which are connectable to a first power supply; and
a second heating element which is connected to the mounting formation and which includes a second pair of electrical connection terminals which are connectable to a second power supply, independent of the first power supply, wherein the first and second heating elements are electrically insulated from each other in a configuration in which the first and second power supplies are simultaneously connectable to the respective heating elements.
2. A heating device as claimed in claim 1 , which further includes a first elongate sleeve which is connected to the mounting formation for receiving a first thermostat.
3. A heating device as claimed in claim 2, which further includes a second elongate sleeve which is connected to the mounting formation for receiving a second thermostat, the second sleeve being spaced from the first.
4. A heating device as claimed in any of the preceding claims, wherein the first and second heating elements differ in length, are parallel and are arranged in crisscross fashion, the longer element crossing over the shorter element.
5. A heating device as claimed in any of the preceding claims, wherein the mounting formation comprises an externally screw-threaded attachment portion and a hexagonal head having a greater diameter than the attachment portion.
6. A heating device as claimed in claim 5, in which the heating elements pass through the mounting formation such that the respective pairs of electrical connection terminals are arranged on one side of the mounting formation and protrude from the head.
7. A heating device as claimed in any of the preceding claims, wherein the first and second heating elements are tubular, sheathed resistive heating elements.
8. A heating device as claimed in any of the preceding claims, wherein the heating apparatus is in the form of a geyser for heating water.
9. A method of retrofitting a retrofittable electrical heating device to a geyser, the retrofittable electrical heating device including:
a mounting formation for removably mounting the heating device to the geyser;
a first heating element which is connected to the mounting formation and which includes a first pair of electrical connection terminals which are connectable to a first power supply; and
a second heating element which is connected to the mounting formation and which includes a second pair of electrical connection terminals which are connectable to a second power supply, independent of the first power supply, wherein the first and second heating elements are electrically insulated from each other in a configuration in which the first and second power supplies are simultaneously connectable to the respective heating elements, the method including:
disconnecting and removing an existing electrical heating element from the geyser;
retrofitting the retrofittable heating device to the geyser; and
connecting the first power supply to the first pair of connection terminals and connecting the second power supply to the second pair of connection terminals.
10. A method as claimed in claim 9, wherein the retrofittable heating device is a heating device as claimed in any of claims 1 to 8 inclusive.
1 1 . A method of retrofitting a retrofittable electrical heating device to an electrical heating apparatus having an existing heating element, the retrofittable electrical heating device including:
a mounting formation for removably mounting the heating device to the heating apparatus;
a first heating element which is connected to the mounting formation and which includes a first pair of electrical connection terminals which are connectable to a first power supply; and
a second heating element which is connected to the mounting formation and which includes a second pair of electrical connection terminals which are connectable to a second power supply, independent of the first power supply, wherein the first and second heating elements are electrically insulated from each other in a configuration in which the first and second power supplies are simultaneously connectable to the respective heating elements, the method including:
disconnecting and removing the existing electrical heating element from the heating apparatus;
retrofitting the retrofittable heating device to the heating apparatus; and connecting the first power supply to the first pair of connection terminals and connecting the second power supply to the second pair of connection terminals of the retrofittable heating device.
12. An installation which includes:
a heating apparatus;
an electrical heating device as claimed in any of claims 1 to 8 inclusive, mounted to the heating apparatus;
a first power supply; and
a second power supply, independent of the first power supply, wherein the first power supply is connected to the first heating element of the heating device and the second power supply is connected to the second heating element.
13. An installation as claimed in claim 12, wherein the first power supply is a mains power supply.
14. An installation as claimed in claim 12 or claim 13, wherein the second power supply is a photovoltaic power supply.
PCT/IB2014/058151 2013-09-27 2014-01-09 An electrical heating device WO2015044793A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2013/07268 2013-09-27
ZA2013/07268A ZA201307268B (en) 2013-09-27 2013-09-27 An electrical heating device

Publications (1)

Publication Number Publication Date
WO2015044793A1 true WO2015044793A1 (en) 2015-04-02

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ID=52742161

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2014/058151 WO2015044793A1 (en) 2013-09-27 2014-01-09 An electrical heating device

Country Status (2)

Country Link
WO (1) WO2015044793A1 (en)
ZA (1) ZA201307268B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6289177B1 (en) * 1998-06-29 2001-09-11 John W. Finger Encapsulated heating element fluid heater
GB2457139A (en) * 2008-02-11 2009-08-12 Nicholas Julian Jan Francis Macphail Water heating system comprising an immersion heater supplied with electricity generated by an alternative energy source
US20090214195A1 (en) * 2008-02-25 2009-08-27 Thomasson Samuel L PV water heating system
WO2011073938A2 (en) * 2009-12-16 2011-06-23 Eds-Usa Inc. Photovoltaic heater
DE102012105609B3 (en) * 2012-06-27 2013-07-25 Wagner & Co. Solartechnik Gmbh Water heater and method for operating a water heater
US20130266296A1 (en) * 2012-04-09 2013-10-10 David Kreutzman Control Systems for Renewable Hot Water Heating Systems

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6289177B1 (en) * 1998-06-29 2001-09-11 John W. Finger Encapsulated heating element fluid heater
GB2457139A (en) * 2008-02-11 2009-08-12 Nicholas Julian Jan Francis Macphail Water heating system comprising an immersion heater supplied with electricity generated by an alternative energy source
US20090214195A1 (en) * 2008-02-25 2009-08-27 Thomasson Samuel L PV water heating system
WO2011073938A2 (en) * 2009-12-16 2011-06-23 Eds-Usa Inc. Photovoltaic heater
US20130266296A1 (en) * 2012-04-09 2013-10-10 David Kreutzman Control Systems for Renewable Hot Water Heating Systems
DE102012105609B3 (en) * 2012-06-27 2013-07-25 Wagner & Co. Solartechnik Gmbh Water heater and method for operating a water heater

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