US20090142720A1 - Water Heater and a Method of Operating Same - Google Patents
Water Heater and a Method of Operating Same Download PDFInfo
- Publication number
- US20090142720A1 US20090142720A1 US11/992,079 US99207906A US2009142720A1 US 20090142720 A1 US20090142720 A1 US 20090142720A1 US 99207906 A US99207906 A US 99207906A US 2009142720 A1 US2009142720 A1 US 2009142720A1
- Authority
- US
- United States
- Prior art keywords
- flue
- tank
- duct
- water heater
- pilot flame
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
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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
- F24H1/205—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes with furnace tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L11/00—Arrangements of valves or dampers after the fire
Definitions
- the present invention relates to a water heater and a method of operating same.
- the invention has been primarily developed for use in a natural draft water heater that has a gas burner at the base of the water tank and a flue which passes through the water tank for heating water in the tank.
- Natural draft water heaters are well known and are used extensively in domestic water heating and other applications. The energy efficiency of such water heaters is considered to be an important consideration by many purchasers and owners of such water heaters.
- the Australian Gas Association conducts performance testing for water heaters and generates a Star (Trade Mark) rating indicating the heater's overall energy efficiency (e.g. 5 Star).
- Star Trade Mark
- the Star rating is, generally speaking, a combination of: Efficiency; and Maintenance.
- Efficiency is a measure of the energy transfer from fuel to heated water (i.e. heat exchanging efficiency).
- Maintenance is a measure of retaining stored energy in the water (i.e. insulation effectiveness).
- Natural draft water heaters operate in two modes: a ‘heating’ mode when the main burner is operating (i.e. alight); and an ‘idle’ mode when the main burner is not operating.
- a ‘heating’ mode when the main burner is operating (i.e. alight); and an ‘idle’ mode when the main burner is not operating.
- a ‘heating’ mode when the main burner is operating (i.e. alight); and an ‘idle’ mode when the main burner is not operating.
- a ‘heating’ mode when the main burner is operating (i.e. alight); and an ‘idle’ mode when the main burner is not operating.
- a constantly operating pilot flame only the burner's pilot flame is alight in idle mode.
- an electronically controlled gas valve that re-ignites the main burner electronically, there is no pilot flame alight in idle mode.
- a water heater with a pilot flame and an open flue i.e. a flue vented directly to atmosphere without restriction
- a damper i.e. a flow control valve downstream of the flue which is controlled to block the flue opening to atmosphere when in idle mode.
- the present invention provides a water heater including:
- the length of the duct is preferably approximately 20% to 30%, most preferably 25%, of the length of the flue.
- the duct and the flue are preferably cylindrical and have approximately equal diameters.
- the present invention provides a water heater including:
- the duct and the flue are preferably cylindrical.
- the present invention provides method of maintaining a pilot flame alight in a water heater having a tank with: a bottom; a top; and a substantially central flue, the method including the steps of:
- the present invention provides a method of operating a water heater in idle mode, the water heater having a tank with: a bottom; a top; a burner with a pilot flame; and a substantially central flue, the method including the steps of:
- FIG. 1 is a cross-sectional schematic side view of an embodiment of a water heater according to a first embodiment of the invention.
- the water heater 10 includes a cylindrical steel water tank 12 with a central flue 14 .
- the flue 14 has a length L 1 and a spiral baffle 16 therein.
- the tank has an outwardly concave (domed) bottom 18 and an outwardly concave (domed) top 20 .
- the flue 14 has an inlet 22 adjacent the tank bottom 18 and an outlet 24 slightly above the tank top 20 . In use, the tank 12 is almost completely filled with water.
- cold water is introduced from mains water supply via a cold water inlet (not shown) near the tank bottom 16 of the tank 12 and hot water is drawn off for use via a hot water outlet (not shown) near the top 20 of the tank 12 .
- a burner 26 is located beneath the tank bottom 18 .
- the burner 28 has a pilot flame (not shown) and is adapted to burn fuel, preferably natural gas, and discharge heated gases up through the flue 14 for heat transfer to the water in the tank 12 .
- the exterior of the tank 12 is surrounded by insulation 28 .
- the tank 12 and the insulation 28 are contained within an outer casing 30 , which includes an air inlet 32 .
- the air inlet 32 is in gas communication with the burner 26 via passage 34 .
- the burner 28 also has an associated gas control system 36 .
- the water heater 10 also includes a heated gas outlet duct 40 having a first upper end 42 connected to the outlet 22 of the flue by an insulated U-shaped connector 44 and a lower second end 46 open to atmosphere.
- the duct 40 has a length L 2 and has a substantially open or unrestricted cylindrical cross-section (i.e. free of valves or dampers and the like).
- the duct 40 is adapted to provide a resistance to the gas flow therethrough such that when the water heater is in idle mode (i.e. only the pilot flame is burning) the gas passing through the duct 40 is subjected to a balancing resistance, which limits the air drawn into the flue 14 to only the minimum that is required to achieve combustion and maintain the pilot flame alight.
- the energy that would ordinarily be lost, in idle mode, through an unrestricted outlet is minimised and the Star rating of the water heater is improved, particularly the Maintenance-based component of the Star rating.
- the resistance of the duct 40 is primarily adjusted by varying its diameter and length.
- the diameter of the duct 40 is approximately equal to that of the flue 16 to avoid choking the gas flow through the flue/duct.
- the duct length L 2 is approximately 25% of the flue length L 2 .
- the relative length of the duct 40 is determined by the following iterative process. Firstly, the gas supply for the pilot flame is established as the minimum amount possible to meet environmental (e.g. wind) and legislative requirements. Secondly, the water heat 10 is tested, without the duct 40 attached, and the restriction of the baffle 16 adjusted to meet emission requirements and maximise the Efficiency-based Star rating component. The duct 40 is then attached. As discussed above, this improves the Maintenance-based Star rating component. However, it also generally lead to a reduction in the Efficiency-based Star rating component. The baffle 16 is then adjusted, by making it less restrictive, to increase the Efficiency-based component until an acceptable level of emissions is reached. The length of the duct 40 is then adjusted to seek improvements in the Maintenance-based component. This process continues in an iterative manner until the overall Star rating is maximised.
- environmental e.g. wind
- legislative requirements e.g. wind
- the water heat 10 is tested, without the duct 40 attached, and the restriction of the baffle 16 adjusted to meet emission requirements and maximise the Efficiency-based Star
- the water heater 10 provides improved efficiency as the duct 40 increases the transfer of heat from the pilot flame to the water when the heater 10 is in idle mode by reducing heat loss from the flue 14 to atmosphere. This improves the Maintenance-based Star rating component. More particularly, it is estimated that water heaters similar to that described with reference to the water heater 10 will, in idle mode, transfer approximately 80% of the pilot flame energy to the water and only lose approximately 20 % through the flue. Further, such water heaters do not exhibit a loss in their Efficiency-based Star rating component sufficient to compromise their Star rating overall. Moreover, this is achieved in a relatively mechanically simple arrangement that is not susceptible to blocking or other mechanical failure.
- a water heater (not shown) according to a second embodiment of the invention is similar to the heater 10 except it has an electronically controlled gas valve that re-ignites the main burner electronically. This heater has no pilot flame alight in idle mode.
- the duct 40 also improves the Star rating of this heater as it provide a resistance to, and thus slows, the flow of the heated air (ie. air heated by transfer from the surrounding water) leaving the flue.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Details Of Fluid Heaters (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
Abstract
A water heater (10) including a tank (12), a burner (26) and a heated gas outlet duct (40). The tank (12) has a substantially central flue (14) having an outlet (24) substantially adjacent the top (20) of the tank (12). The tank (12) is adapted for mounting with the flue (14) substantially vertically. The burner (26) is located beneath the tank (12). The burner (26) has an air inlet (32) and a pilot flame and is adapted to a burn a fuel to discharge heated gases up through the flue (14). The heated gas outlet duct (40) is of substantially unrestricted cross-section and has an upper, first end (42) in gas communication with the flue outlet (24) and a second, lower end (46) in gas communication with atmosphere. When only the pilot flame is burning, the heated gas outlet duct (40) is adapted to restrict the air drawn into the flue (14) via the air inlet (32) to the minimum amount required to maintain the pilot flame alight.
Description
- The present invention relates to a water heater and a method of operating same.
- The invention has been primarily developed for use in a natural draft water heater that has a gas burner at the base of the water tank and a flue which passes through the water tank for heating water in the tank.
- Natural draft water heaters are well known and are used extensively in domestic water heating and other applications. The energy efficiency of such water heaters is considered to be an important consideration by many purchasers and owners of such water heaters.
- The Australian Gas Association (AGA) conducts performance testing for water heaters and generates a Star (Trade Mark) rating indicating the heater's overall energy efficiency (e.g. 5 Star). The higher the Star rating, the higher the overall energy efficiency. The Star rating is, generally speaking, a combination of: Efficiency; and Maintenance. Efficiency is a measure of the energy transfer from fuel to heated water (i.e. heat exchanging efficiency). Maintenance is a measure of retaining stored energy in the water (i.e. insulation effectiveness).
- Natural draft water heaters operate in two modes: a ‘heating’ mode when the main burner is operating (i.e. alight); and an ‘idle’ mode when the main burner is not operating. In water heaters that have a constantly operating pilot flame, only the burner's pilot flame is alight in idle mode. In water heaters that have an electronically controlled gas valve that re-ignites the main burner electronically, there is no pilot flame alight in idle mode.
- Further, a water heater with a pilot flame and an open flue (i.e. a flue vented directly to atmosphere without restriction) will, in idle mode, transfer approximately 60% of the pilot flame's energy to the water and lose approximately 40% through the flue. Attempts to minimise this energy loss include placing a damper (i.e. a flow control valve) downstream of the flue which is controlled to block the flue opening to atmosphere when in idle mode.
- However, disadvantages of this approach are that the damper adds to the cost and complexity of the water heater and can also create a safety hazard if it jams in the closed position when the heater is in the heating mode.
- It is an object of the present invention to provide a mechanically simple, relatively low cost water heater able to achieve a 5 Star AGA energy rating.
- Accordingly, in a first aspect, the present invention provides a water heater including:
-
- a tank with a substantially central flue having an outlet substantially adjacent the top of the tank, the tank being adapted for mounting with the flue substantially vertical;
- a burner located beneath the tank, the burner having an air inlet and a pilot flame and being adapted to a burn a fuel to discharge heated gases up through the flue; and
- a heated gas outlet duct of substantially unrestricted cross-section having an upper, first end in gas communication with the flue outlet and a second, lower end in gas communication with atmosphere,
- wherein, when only the pilot flame is burning, the heated gas outlet duct is adapted to restrict the air drawn into the flue via the air inlet to the minimum amount required to maintain the pilot flame alight.
- The length of the duct is preferably approximately 20% to 30%, most preferably 25%, of the length of the flue. The duct and the flue are preferably cylindrical and have approximately equal diameters.
- In a second aspect, the present invention provides a water heater including:
-
- a tank with a substantially central flue having an outlet substantially adjacent the top of the tank, the tank being adapted for mounting with the flue substantially vertical;
- a burner located beneath the tank, the burner having an air inlet and an electronically controlled ignitor and being adapted to a burn a fuel to discharge heated gases up through the flue; and
- a heated gas outlet duct of substantially unrestricted cross-section having an upper, first end in gas communication with the flue outlet and a second, lower end in gas communication with atmosphere,
- wherein, the duct has approximately the same cross sectional area of the flue and is approximately 25% of the length of the flue.
- The duct and the flue are preferably cylindrical.
- In a third aspect, the present invention provides method of maintaining a pilot flame alight in a water heater having a tank with: a bottom; a top; and a substantially central flue, the method including the steps of:
-
- directing the heated gases from the pilot flame from the tank bottom to the tank top via the flue; and
- directing the heated gases from the tank top to atmosphere via a generally downwardly directed duct of substantially unrestricted cross-section, the duct being adapted to restrict the gas flow drawn into the flue to only the minimum amount required to maintain the pilot flame alight.
- In a fourth aspect, the present invention provides a method of operating a water heater in idle mode, the water heater having a tank with: a bottom; a top; a burner with a pilot flame; and a substantially central flue, the method including the steps of:
-
- directing the heated gases from the pilot flame from the tank bottom to the tank top via the flue; and
- directing the heated gases from the tank top to atmosphere via a generally downwardly directed duct of substantially unrestricted cross-section, the duct being adapted to restrict the gas flow drawn into the flue to only the minimum amount required to maintain the pilot flame alight.
- Preferred embodiments of the present invention will now be described, by way of examples only, with reference to the accompanying drawing wherein:
-
FIG. 1 is a cross-sectional schematic side view of an embodiment of a water heater according to a first embodiment of the invention. - Referring to
FIG. 1 , there is shown a naturaldraft water heater 10 according to a first embodiment of the invention. Thewater heater 10 includes a cylindricalsteel water tank 12 with acentral flue 14. Theflue 14 has a length L1 and aspiral baffle 16 therein. The tank has an outwardly concave (domed)bottom 18 and an outwardly concave (domed) top 20. Theflue 14 has aninlet 22 adjacent thetank bottom 18 and anoutlet 24 slightly above the tank top 20. In use, thetank 12 is almost completely filled with water. - It will be well understood by those skilled in the art that cold water is introduced from mains water supply via a cold water inlet (not shown) near the
tank bottom 16 of thetank 12 and hot water is drawn off for use via a hot water outlet (not shown) near the top 20 of thetank 12. - A
burner 26 is located beneath thetank bottom 18. As is well understood by persons skilled in the art, theburner 28 has a pilot flame (not shown) and is adapted to burn fuel, preferably natural gas, and discharge heated gases up through theflue 14 for heat transfer to the water in thetank 12. The exterior of thetank 12 is surrounded byinsulation 28. Thetank 12 and theinsulation 28 are contained within anouter casing 30, which includes anair inlet 32. Theair inlet 32 is in gas communication with theburner 26 viapassage 34. Theburner 28 also has an associatedgas control system 36. - The
water heater 10 also includes a heatedgas outlet duct 40 having a firstupper end 42 connected to theoutlet 22 of the flue by an insulatedU-shaped connector 44 and a lowersecond end 46 open to atmosphere. Theduct 40 has a length L2 and has a substantially open or unrestricted cylindrical cross-section (i.e. free of valves or dampers and the like). Theduct 40 is adapted to provide a resistance to the gas flow therethrough such that when the water heater is in idle mode (i.e. only the pilot flame is burning) the gas passing through theduct 40 is subjected to a balancing resistance, which limits the air drawn into theflue 14 to only the minimum that is required to achieve combustion and maintain the pilot flame alight. Generally speaking, as a result, the energy that would ordinarily be lost, in idle mode, through an unrestricted outlet is minimised and the Star rating of the water heater is improved, particularly the Maintenance-based component of the Star rating. - The resistance of the
duct 40 is primarily adjusted by varying its diameter and length. The diameter of theduct 40 is approximately equal to that of theflue 16 to avoid choking the gas flow through the flue/duct. In the embodiment shown, the duct length L2 is approximately 25% of the flue length L2. Further, it will be appreciated by those persons skilled in the art that other factors can influence the resistance provided by theduct 40 including material and internal surface finish. - Generally speaking, the relative length of the
duct 40 is determined by the following iterative process. Firstly, the gas supply for the pilot flame is established as the minimum amount possible to meet environmental (e.g. wind) and legislative requirements. Secondly, thewater heat 10 is tested, without theduct 40 attached, and the restriction of thebaffle 16 adjusted to meet emission requirements and maximise the Efficiency-based Star rating component. Theduct 40 is then attached. As discussed above, this improves the Maintenance-based Star rating component. However, it also generally lead to a reduction in the Efficiency-based Star rating component. Thebaffle 16 is then adjusted, by making it less restrictive, to increase the Efficiency-based component until an acceptable level of emissions is reached. The length of theduct 40 is then adjusted to seek improvements in the Maintenance-based component. This process continues in an iterative manner until the overall Star rating is maximised. - The
water heater 10 provides improved efficiency as theduct 40 increases the transfer of heat from the pilot flame to the water when theheater 10 is in idle mode by reducing heat loss from theflue 14 to atmosphere. This improves the Maintenance-based Star rating component. More particularly, it is estimated that water heaters similar to that described with reference to thewater heater 10 will, in idle mode, transfer approximately 80% of the pilot flame energy to the water and only lose approximately 20% through the flue. Further, such water heaters do not exhibit a loss in their Efficiency-based Star rating component sufficient to compromise their Star rating overall. Moreover, this is achieved in a relatively mechanically simple arrangement that is not susceptible to blocking or other mechanical failure. - A water heater (not shown) according to a second embodiment of the invention is similar to the
heater 10 except it has an electronically controlled gas valve that re-ignites the main burner electronically. This heater has no pilot flame alight in idle mode. Theduct 40 also improves the Star rating of this heater as it provide a resistance to, and thus slows, the flow of the heated air (ie. air heated by transfer from the surrounding water) leaving the flue. - Although the invention has been described with reference to the preferred embodiments, it will be appreciated by those skilled in the art that the invention may be embodied in many other forms.
Claims (9)
1. A water heater including: a tank with a substantially central flue having an outlet substantially adjacent the top of the tank, the tank being adapted for mounting with the flue substantially vertical; a burner located beneath the tank, the burner having an air inlet and a pilot flame and being adapted to a burn a fuel to discharge heated gases up through the flue; and a heated gas outlet duct of substantially unrestricted cross-section having an upper, first end in gas communication with the flue outlet and a second, lower end in gas communication with atmosphere,
wherein, when only the pilot flame is burning, the heated gas outlet duct is adapted to restrict the air drawn into the flue via the air inlet to the minimum amount required to maintain the pilot flame alight.
2. The water heater as claimed in claim 2 , wherein the length of the duct is approximately 20% to 30% of the length of the flue.
3. The water heater as claimed in claim 1 , wherein the length of the duct is approximately 25% of the length of the flue.
4. The water heater as claimed in claim 1 , wherein the duct and the flue are cylindrical.
5. The water heater as claimed in claim 4 , wherein the duct and flue have approximately equal diameters.
6. A water heater including: a tank with a substantially central flue having an outlet substantially adjacent the top of the tank, the tank being adapted for mounting with the flue substantially vertical; a burner located beneath the tank, the burner having an air inlet and an electronically controlled ignitor and being adapted to a burn a fuel to discharge heated gases up through the flue; and a heated gas outlet duct of substantially unrestricted cross-section having an upper, first end in gas communication with the flue outlet and a second, lower end in gas communication with atmosphere, wherein, the duct has approximately the same cross sectional area of the flue and is approximately 25% of the length of the flue.
7. The water heater claimed in claim 6 , wherein the duct and the flue are cylindrical.
8. A method of maintaining a pilot flame alight in a water heater having a tank with: a bottom; a top; and a substantially central flue, the method including the steps of: directing the heated gases from the pilot flame from the tank bottom to the tank top via the flue; and directing the heated gases from the tank top to atmosphere via a generally downwardly directed duct of substantially unrestricted cross-section, the duct being adapted to restrict the gas flow drawn into the flue to only the minimum amount required to maintain the pilot flame alight.
9. A method of operating a water heater in idle mode, the water heater having a tank with: a bottom; a top; a burner with a pilot flame; and a substantially central flue, the method including the steps of: directing the heated gases from the pilot flame from the tank bottom to the tank top via the flue; and directing the heated gases from the tank top to atmosphere via a generally downwardly directed duct of substantially unrestricted cross-section, the duct being adapted to restrict the gas flow drawn into the flue to only the minimum amount required to maintain the pilot flame alight.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2005905137A AU2005905137A0 (en) | 2005-09-16 | A water heater and a method of operating same | |
AU2005905137 | 2005-09-16 | ||
PCT/AU2006/001085 WO2007030855A1 (en) | 2005-09-16 | 2006-08-01 | A water heater and a method of operating same |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090142720A1 true US20090142720A1 (en) | 2009-06-04 |
Family
ID=37864540
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/992,079 Abandoned US20090142720A1 (en) | 2005-09-16 | 2006-08-01 | Water Heater and a Method of Operating Same |
Country Status (4)
Country | Link |
---|---|
US (1) | US20090142720A1 (en) |
CN (1) | CN101263347B (en) |
NZ (1) | NZ566630A (en) |
WO (1) | WO2007030855A1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100116227A1 (en) * | 2005-02-07 | 2010-05-13 | Vogel G Scott | Systems and methods for controlling a water heater |
US20130043252A1 (en) * | 2011-08-17 | 2013-02-21 | Jonathan D. Nelson | Water seepage abatement in water heaters |
US20130269096A1 (en) * | 2012-04-11 | 2013-10-17 | Mark G. Pleva | Non-pressurized indirect swimming pool water heating system |
US9103550B2 (en) | 2005-02-07 | 2015-08-11 | Emerson Electric Co. | Systems and methods for controlling a water heater |
US20150357168A1 (en) * | 2014-06-04 | 2015-12-10 | Applied Materials, Inc. | Reagent delivery system freeze prevention heat exchanger |
US10119722B2 (en) * | 2014-03-24 | 2018-11-06 | Wilson Ng | Flue arrangement |
US11262099B2 (en) * | 2019-09-11 | 2022-03-01 | Kyungdong Navien Co., Ltd. | Cap and water-heating device including the same |
US11573032B2 (en) * | 2019-07-16 | 2023-02-07 | Rheem Manufacturing Company | Water heater pilot operation |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5020512A (en) * | 1984-08-09 | 1991-06-04 | State Industries, Inc. | Water heater construction and method of heating water |
US6916173B2 (en) * | 2001-12-19 | 2005-07-12 | Schott Ag | Method and apparatus for operating gaseous fuel fired heater |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2012411B (en) * | 1978-01-13 | 1982-06-30 | Mitchell D A | Gas operable water heater |
CN2092711U (en) * | 1991-05-29 | 1992-01-08 | 马玉龙 | Combustion gas boiler |
AUPR558601A0 (en) * | 2001-06-12 | 2001-07-12 | Rheem Australia Pty Limited | A storage water heater with reduced heat maintenance rate |
-
2006
- 2006-08-01 US US11/992,079 patent/US20090142720A1/en not_active Abandoned
- 2006-08-01 NZ NZ566630A patent/NZ566630A/en not_active IP Right Cessation
- 2006-08-01 CN CN2006800336139A patent/CN101263347B/en not_active Expired - Fee Related
- 2006-08-01 WO PCT/AU2006/001085 patent/WO2007030855A1/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5020512A (en) * | 1984-08-09 | 1991-06-04 | State Industries, Inc. | Water heater construction and method of heating water |
US6916173B2 (en) * | 2001-12-19 | 2005-07-12 | Schott Ag | Method and apparatus for operating gaseous fuel fired heater |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100116227A1 (en) * | 2005-02-07 | 2010-05-13 | Vogel G Scott | Systems and methods for controlling a water heater |
US8544423B2 (en) * | 2005-02-07 | 2013-10-01 | Emerson Electric Co. | Systems and methods for controlling a water heater |
US9103550B2 (en) | 2005-02-07 | 2015-08-11 | Emerson Electric Co. | Systems and methods for controlling a water heater |
US20130043252A1 (en) * | 2011-08-17 | 2013-02-21 | Jonathan D. Nelson | Water seepage abatement in water heaters |
US8991638B2 (en) * | 2011-08-17 | 2015-03-31 | General Electric Company | Water seepage abatement in water heaters |
US20130269096A1 (en) * | 2012-04-11 | 2013-10-17 | Mark G. Pleva | Non-pressurized indirect swimming pool water heating system |
US8881719B2 (en) * | 2012-04-11 | 2014-11-11 | Sentry Valve Company, Inc. | Non-pressurized indirect swimming pool water heating system |
US10119722B2 (en) * | 2014-03-24 | 2018-11-06 | Wilson Ng | Flue arrangement |
US20150357168A1 (en) * | 2014-06-04 | 2015-12-10 | Applied Materials, Inc. | Reagent delivery system freeze prevention heat exchanger |
US10115571B2 (en) * | 2014-06-04 | 2018-10-30 | Applied Materials, Inc. | Reagent delivery system freeze prevention heat exchanger |
US11573032B2 (en) * | 2019-07-16 | 2023-02-07 | Rheem Manufacturing Company | Water heater pilot operation |
US11262099B2 (en) * | 2019-09-11 | 2022-03-01 | Kyungdong Navien Co., Ltd. | Cap and water-heating device including the same |
Also Published As
Publication number | Publication date |
---|---|
CN101263347A (en) | 2008-09-10 |
NZ566630A (en) | 2011-02-25 |
CN101263347B (en) | 2010-10-13 |
WO2007030855A1 (en) | 2007-03-22 |
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