US20070077043A1 - Electric water heater with hot water outlet dip tube - Google Patents
Electric water heater with hot water outlet dip tube Download PDFInfo
- Publication number
- US20070077043A1 US20070077043A1 US11/243,542 US24354205A US2007077043A1 US 20070077043 A1 US20070077043 A1 US 20070077043A1 US 24354205 A US24354205 A US 24354205A US 2007077043 A1 US2007077043 A1 US 2007077043A1
- Authority
- US
- United States
- Prior art keywords
- water
- hot water
- tank
- container
- dip tube
- 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.)
- Granted
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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
- F24H1/201—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
- F24H9/12—Arrangements for connecting heaters to circulation pipes
- F24H9/13—Arrangements for connecting heaters to circulation pipes for water heaters
- F24H9/133—Storage heaters
Definitions
- This invention relates to electric water heaters, particularly to energy efficient electric water heaters having an improved first hour rating.
- This invention relates to an electric water heater including a water container; an element associated with the water container to heat water in the water container; a cold water inlet associated with the water container; a hot water outlet associated with the water container; and a dip tube connected to the hot water outlet, the dip tube having at least one opening proximate the hot water outlet and at least one opening positioned proximate to or below the element.
- This invention also relates to an electric water heater including a water tank; an upper element associated with the tank to heat water in the tank; a lower element associated with the tank to heat water in the tank; a cold water inlet positioned in a top portion of the tank; a hot water outlet positioned in the top portion of the tank; and a dip tube connected to the hot water outlet and having a plurality of upper openings positioned between the top portion and the upper element, and a plurality of lower openings positioned proximate to or below the upper element.
- This invention further relates to a method of increasing first hour hot water supply from an electric water heater including a water tank, a heating element, a cold water inlet and a hot water outlet, including: reducing the temperature of hot water passing through the hot water outlet by causing relatively colder water in the tank to mix with relatively hotter water in the tank by connecting a dip tube having at least one opening proximate the hot water outlet and at least one opening positioned proximate to or below the element such that the relatively hotter water enters through the at least one opening proximate the hot water outlet and the relatively colder water enters to the hot water outlet through the at least one opening proximate to or below the element.
- This invention still further relates to a method of increasing first hour water supply from an electric water heater including a water tank, an element, a cold water inlet and a hot water outlet, including: mixing relatively colder water in the tank with relatively hotter water in the tank with a dip tube having at least one opening adjacent a top portion of the tank and at least one opening positioned proximate to or below the element and connected to the hot water outlet.
- FIG. 1 is a schematic front elevational view of an electric water heater in accordance with aspects of the invention, wherein dashed lines indicate internal features.
- FIG. 2 is a schematic front elevational view of the water heater of FIG. 1 , rotated by 90°.
- FIG. 3 is a top plan view of the water heater shown in FIGS. 1 and 2 .
- FIG. 4 is a front elevational view of a hot water inlet dip tube in accordance with aspects of the invention.
- FIG. 5 is a bottom plan view of the dip tube of FIG. 4 .
- FIGS. 1-3 show an electric water heater 10 in accordance with aspects of the invention.
- Water heater 10 includes a water tank 12 surrounded by foam insulation 14 which is in itself surrounded by outer jacket 16 .
- Outer jacket 16 is capped on its upper end by a top pan 18 and on its lower end by a bottom pan 20 .
- a drain valve 22 is located near the bottom pan and extends outwardly from tank 12 , though foam insulation 14 and outer jacket 16 .
- a temperature and pressure relief valve 24 is located near the top of water heater 10 and extends outwardly from tank 12 , through foam insulation 14 and outer jacket 16 .
- Water in tank 12 is heated with an upper element 26 and a lower element 28 .
- Upper element 26 connects to the side of tank 12 and typically includes a mounting base 30 along with a sensing device such as a thermistor (not shown).
- Lower element 28 has a similar mounting base 32 and a similar sensing element such as a thermistor (not shown).
- Both of elements 26 and 28 connect to a control device which, in this case, is microcontroller 34 positioned in a recess in top pan 18 .
- the controller is also connected to an upper thermostat 36 and a lower thermostat 38 which operatively connect to elements 26 and 28 , respectively.
- This is only one of many possible arrangements. For example, it is possible to employ “standard” electromechanical thermostats, electronic controls with thermistors and the like. In any event, the manner of controlling the electrical portion of the water heater is not critical to this invention.
- Water heater 10 also has a cold water inlet 40 extending from the top of tank 12 through top pan 18 .
- water heater 10 has a hot water outlet 42 extending from the top of tank 12 through top pan 18 .
- a cold water dip tube 44 connects to a cold water inlet 40 and extends downwardly through tank 12 . As shown in the Figures, cold water dip tube 44 extends substantially toward the bottom of tank 12 .
- Hot water outlet 42 connects to a hot water dip tube 46 which also extends downwardly within tank 12 .
- hot water dip tube 46 comprises an elongated, substantially cylindrical tube 48 having a multiplicity of openings.
- the openings comprise upper openings 50 and lower openings 54 .
- the openings are spaced apart and numbered as set forth in more detail below.
- Hot water dip tube 46 has on its upper end a flange 56 and on its lower end a so-called seal end 58 .
- Seal end 58 can be closed or can be open in the “basket” shape as shown in FIGS. 4 and 5 .
- Hot water dip tube 46 may be formed from a variety of different types of material well known in the art and can have different diameters and lengths that are adapted to fit the size of hot water outlet 42 and the size of tank 12 . Solely for the purpose of illustration, dip tube 46 as shown in FIGS. 4 and 5 is described in accordance with one exemplary form that is particularly suited for a water heater having a 50-gallon tank.
- the diameter of substantially cylindrical tube 48 is about 0.65 inches.
- the overall length of hot water dip tube 46 as shown by arrows “B”, is about 22 inches.
- the diameter of openings 50 and 54 is about 0.188 inches.
- the space between the center points of openings 50 as shown by arrows “C”, is about 0.44 inches.
- the spacings between center points of openings 54 are about 0.44 inches.
- the distance between flange 56 and the center point of upper opening 50 is about 1.44 inches, as shown by arrows “E”. Finally, the distance between flange 56 and the center point of the uppermost one of lower openings 54 is about 19.5 inches, as shown by arrows “F”.
- the hot water dip tube 46 shown in FIGS. 4 and 5 has additional sets of upper openings 50 that match the three openings 50 that are directly shown in the drawings.
- Those other upper openings 50 include three additional sets of three openings 50 that are present on hot water dip tube 46 at three rotational spacings of 90° each. Two of those three additional sets of openings are labeled openings 50 a and 50 b , respectively.
- openings 50 a and 50 b there are three additional sets of five openings at three locations at 90° rotational spacings.
- the additional sets of lower openings are labeled 54 a and 54 b , respectively. In each instance, with respect to openings 50 and 54 , there are corresponding sets on the surfaces directly opposed to those openings at a rotation of 180°.
- hot water dip tube 46 is shown with lower openings 54 at a location below element 30 .
- openings 50 are shown at a location proximate to or adjacent hot water outlet 42 .
- FIG. 1 has been labeled with arrows “H” and “I”, respectively, to assist in better understanding the various locations of the upper and lower openings.
- openings 54 they are located in a space as set forth by arrows “H”.
- lower openings 54 are substantially below element 26 .
- lower openings 54 may be located further below element 30 , extending downwardly almost to the bottom of tank 20 , if desired.
- the configuration shown in FIG. 1 is particularly preferred.
- the distance between the uppermost one of upper openings 50 and hot water outlet 42 are shown by arrows “I” in FIG. 1 .
- the upper openings 50 are positioned below hot water outlet 42 in a range of about 1 inch to about 5 inches. It is especially preferred that the uppermost one of the upper openings 50 is below the hot water outlet by at least about 1 inch.
- the uppermost one of the lower openings 54 should be below element 26 .
- the uppermost one of the lower opening 54 should be at least about 1 inch below element 26 .
- a further advantage is that the first hour rating of the water heater increases substantially.
- the Applicants conducted a series of tests that demonstrate the dramatic increase in first hour water supply in accordance with this invention.
- the results are set forth in Table 1.
- the experiments were conducted on a water heater having a 50-gallon tank with upper and lower elements, as shown in FIGS. 1 and 2 .
- the first two columns of Table 1 reflect Comparative Examples wherein a standard water heater was employed that did not contain a hot water dip tube. The following six columns were for similar water heaters equipped with hot water dip tubes. TABLE 1 Comparative Comparative Ex. 1 Ex. 2 Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Ex.
- the improvement in the first hour rating is about 110% to about 120% greater than standard units. This is a significant improvement in the ability of an electric water heater to provide hot water in greater quantities which is a significant advantage to the user.
Abstract
Description
- This invention relates to electric water heaters, particularly to energy efficient electric water heaters having an improved first hour rating.
- The water heater industry has for many years attempted to manufacture water heaters that are more energy efficient. Various improvements have been made over the years, including better insulation of the water tank and implementation of microcontrollers to better control the heating elements and utilize a decreased amount of energy to produce hot water. While substantial progress has been made, there is still significant room for improvement.
- Also, in the case of electric water heaters, they have a disadvantage relative to gas water heaters with respect to first hour ratings. Thus, there is a need to provide electric water heaters with better first hour ratings.
- This invention relates to an electric water heater including a water container; an element associated with the water container to heat water in the water container; a cold water inlet associated with the water container; a hot water outlet associated with the water container; and a dip tube connected to the hot water outlet, the dip tube having at least one opening proximate the hot water outlet and at least one opening positioned proximate to or below the element.
- This invention also relates to an electric water heater including a water tank; an upper element associated with the tank to heat water in the tank; a lower element associated with the tank to heat water in the tank; a cold water inlet positioned in a top portion of the tank; a hot water outlet positioned in the top portion of the tank; and a dip tube connected to the hot water outlet and having a plurality of upper openings positioned between the top portion and the upper element, and a plurality of lower openings positioned proximate to or below the upper element.
- This invention further relates to a method of increasing first hour hot water supply from an electric water heater including a water tank, a heating element, a cold water inlet and a hot water outlet, including: reducing the temperature of hot water passing through the hot water outlet by causing relatively colder water in the tank to mix with relatively hotter water in the tank by connecting a dip tube having at least one opening proximate the hot water outlet and at least one opening positioned proximate to or below the element such that the relatively hotter water enters through the at least one opening proximate the hot water outlet and the relatively colder water enters to the hot water outlet through the at least one opening proximate to or below the element.
- This invention still further relates to a method of increasing first hour water supply from an electric water heater including a water tank, an element, a cold water inlet and a hot water outlet, including: mixing relatively colder water in the tank with relatively hotter water in the tank with a dip tube having at least one opening adjacent a top portion of the tank and at least one opening positioned proximate to or below the element and connected to the hot water outlet.
-
FIG. 1 is a schematic front elevational view of an electric water heater in accordance with aspects of the invention, wherein dashed lines indicate internal features. -
FIG. 2 is a schematic front elevational view of the water heater ofFIG. 1 , rotated by 90°. -
FIG. 3 is a top plan view of the water heater shown inFIGS. 1 and 2 . -
FIG. 4 is a front elevational view of a hot water inlet dip tube in accordance with aspects of the invention. -
FIG. 5 is a bottom plan view of the dip tube ofFIG. 4 . - It will be appreciated that the following description is intended to refer to specific aspects of the invention selected for illustration in the drawings and is not intended to define or limit the invention, other than in the appended claims.
-
FIGS. 1-3 show anelectric water heater 10 in accordance with aspects of the invention.Water heater 10 includes awater tank 12 surrounded byfoam insulation 14 which is in itself surrounded byouter jacket 16.Outer jacket 16 is capped on its upper end by atop pan 18 and on its lower end by abottom pan 20. Adrain valve 22 is located near the bottom pan and extends outwardly fromtank 12, thoughfoam insulation 14 andouter jacket 16. Similarly, a temperature andpressure relief valve 24 is located near the top ofwater heater 10 and extends outwardly fromtank 12, throughfoam insulation 14 andouter jacket 16. - Water in
tank 12 is heated with anupper element 26 and alower element 28.Upper element 26 connects to the side oftank 12 and typically includes amounting base 30 along with a sensing device such as a thermistor (not shown).Lower element 28 has asimilar mounting base 32 and a similar sensing element such as a thermistor (not shown). Both ofelements microcontroller 34 positioned in a recess intop pan 18. The controller is also connected to anupper thermostat 36 and alower thermostat 38 which operatively connect toelements -
Water heater 10 also has acold water inlet 40 extending from the top oftank 12 throughtop pan 18. Similarly,water heater 10 has a hot water outlet 42 extending from the top oftank 12 throughtop pan 18. A coldwater dip tube 44 connects to acold water inlet 40 and extends downwardly throughtank 12. As shown in the Figures, coldwater dip tube 44 extends substantially toward the bottom oftank 12. Hot water outlet 42 connects to a hotwater dip tube 46 which also extends downwardly withintank 12. - As also shown in connection with
FIGS. 4 and 5 , hotwater dip tube 46 comprises an elongated, substantiallycylindrical tube 48 having a multiplicity of openings. The openings compriseupper openings 50 andlower openings 54. The openings are spaced apart and numbered as set forth in more detail below. - Hot
water dip tube 46 has on its upper end aflange 56 and on its lower end a so-calledseal end 58.Seal end 58 can be closed or can be open in the “basket” shape as shown inFIGS. 4 and 5 . - Hot
water dip tube 46 may be formed from a variety of different types of material well known in the art and can have different diameters and lengths that are adapted to fit the size of hot water outlet 42 and the size oftank 12. Solely for the purpose of illustration,dip tube 46 as shown inFIGS. 4 and 5 is described in accordance with one exemplary form that is particularly suited for a water heater having a 50-gallon tank. Thus, the diameter of substantiallycylindrical tube 48, as shown by arrows “A”, is about 0.65 inches. The overall length of hotwater dip tube 46, as shown by arrows “B”, is about 22 inches. The diameter ofopenings openings 50, as shown by arrows “C”, is about 0.44 inches. Similarly, the spacings between center points ofopenings 54, as shown by arrows “D”, are about 0.44 inches. - The distance between
flange 56 and the center point ofupper opening 50 is about 1.44 inches, as shown by arrows “E”. Finally, the distance betweenflange 56 and the center point of the uppermost one oflower openings 54 is about 19.5 inches, as shown by arrows “F”. - It should be understood, however, that different dimensions associated with the various openings can be employed, depending on the size and shape of
tank 12, as well as the length and diameter of hotwater dip tube 46. - Also, the hot
water dip tube 46 shown inFIGS. 4 and 5 has additional sets ofupper openings 50 that match the threeopenings 50 that are directly shown in the drawings. Those otherupper openings 50 include three additional sets of threeopenings 50 that are present on hotwater dip tube 46 at three rotational spacings of 90° each. Two of those three additional sets of openings are labeledopenings lower openings 54, there are three additional sets of five openings at three locations at 90° rotational spacings. The additional sets of lower openings are labeled 54 a and 54 b, respectively. In each instance, with respect toopenings - Referring back to
FIG. 1 in particular, hotwater dip tube 46 is shown withlower openings 54 at a location belowelement 30. On the other hand,openings 50 are shown at a location proximate to or adjacent hot water outlet 42.FIG. 1 has been labeled with arrows “H” and “I”, respectively, to assist in better understanding the various locations of the upper and lower openings. In the case ofopenings 54, they are located in a space as set forth by arrows “H”. As particularly shown inFIG. 1 ,lower openings 54 are substantially belowelement 26. However,lower openings 54 may be located further belowelement 30, extending downwardly almost to the bottom oftank 20, if desired. However, the configuration shown inFIG. 1 is particularly preferred. - The distance between the uppermost one of
upper openings 50 and hot water outlet 42 are shown by arrows “I” inFIG. 1 . This means that theupper openings 50 are proximate to or adjacent hot water outlet 42. In practice, theupper openings 50 are positioned below hot water outlet 42 in a range of about 1 inch to about 5 inches. It is especially preferred that the uppermost one of theupper openings 50 is below the hot water outlet by at least about 1 inch. - Referring to
lower openings 54, the uppermost one of thelower openings 54 should be belowelement 26. Preferably, the uppermost one of thelower opening 54 should be at least about 1 inch belowelement 26. - In operation, when hot water is drawn from
water heater 10, relatively hot water withintank 12, which is located in the uppermost portion oftank 12, is drawn throughupper openings 50. However, simultaneously, relatively colder water is drawn intolower openings 54 wherein the relatively hotter water and the relatively colder water mix prior to exitingwater heater 10. Nonetheless, the temperature of the hot water exiting the water heater is sufficiently high to meet the requirements of residential use. - A further advantage is that the first hour rating of the water heater increases substantially. The Applicants conducted a series of tests that demonstrate the dramatic increase in first hour water supply in accordance with this invention. The results are set forth in Table 1. The experiments were conducted on a water heater having a 50-gallon tank with upper and lower elements, as shown in
FIGS. 1 and 2 . The first two columns of Table 1 reflect Comparative Examples wherein a standard water heater was employed that did not contain a hot water dip tube. The following six columns were for similar water heaters equipped with hot water dip tubes.TABLE 1 Comparative Comparative Ex. 1 Ex. 2 Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Ex. 6 First Hour 60.80 57.84 74.23 75.80 79.10 73.75 72.31 77.24 Supply Average 129.62 136.71 124.74 124.95 124.03 125.41 126.52 124.42 outlet temperature, Fahrenheit Average 57.51 57.80 57.19 57.09 57.30 57.30 57.45 57.28 inlet temperature, Fahrenheit Water 70.39 57.84 76.52 75.80 78.32 73.75 72.31 77.24 drawn during test, gallons Total 64.27 60.27 60.78 61.67 65.80 61.38 60.98 62.05 elapsed time of test, minutes
It can be seen from the results of Table 1 that the first hour rating is increased from about 40% to about 60% greater than the capacity of the tank. This is compared to the standard first hour supply, which is only about 15-20% greater than the capacity of the tank. Accordingly, the improvement in the first hour rating is about 110% to about 120% greater than standard units. This is a significant improvement in the ability of an electric water heater to provide hot water in greater quantities which is a significant advantage to the user. - Although this invention has been described in connection with specific forms thereof, it will be appreciated that a wide variety of equivalents may be substituted for the specified elements described herein without departing from the spirit and scope of this invention as described in the appended claims.
Claims (25)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/243,542 US7203418B1 (en) | 2005-10-05 | 2005-10-05 | Electric water heater with hot water outlet dip tube |
CA002561990A CA2561990C (en) | 2005-10-05 | 2006-10-03 | Electric water heater with hot water outlet dip tube |
MXPA06011504A MXPA06011504A (en) | 2005-10-05 | 2006-10-04 | Electric water heater with hot water outlet dip tube. |
CN2006101400115A CN1945154B (en) | 2005-10-05 | 2006-10-08 | Electric water heater with hot water outlet dip tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/243,542 US7203418B1 (en) | 2005-10-05 | 2005-10-05 | Electric water heater with hot water outlet dip tube |
Publications (2)
Publication Number | Publication Date |
---|---|
US20070077043A1 true US20070077043A1 (en) | 2007-04-05 |
US7203418B1 US7203418B1 (en) | 2007-04-10 |
Family
ID=37902050
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/243,542 Expired - Fee Related US7203418B1 (en) | 2005-10-05 | 2005-10-05 | Electric water heater with hot water outlet dip tube |
Country Status (4)
Country | Link |
---|---|
US (1) | US7203418B1 (en) |
CN (1) | CN1945154B (en) |
CA (1) | CA2561990C (en) |
MX (1) | MXPA06011504A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1840481A1 (en) * | 2006-03-30 | 2007-10-03 | Bradford White Corporation | Apparatus and method for introducing and drawing water in a water heater |
CN101373083B (en) * | 2007-08-21 | 2011-06-08 | 中山市爱美泰电器有限公司 | Time-sharing layered cyclic heating water tank |
NO20191315A1 (en) * | 2019-11-04 | 2021-05-05 | Oso Tech As | A water heater |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7634976B2 (en) * | 2006-03-30 | 2009-12-22 | Bradford White Corporation | Apparatus and method for delivering water into a water heater |
US10288316B1 (en) * | 2013-07-29 | 2019-05-14 | Mercury Plastics Llc | Dip tube |
US10215445B1 (en) | 2015-12-22 | 2019-02-26 | Bernard J Mottershead | Thermosiphon system for hot water heater |
US11768012B2 (en) * | 2020-10-30 | 2023-09-26 | Ut-Battelle, Llc | Hydraulically opened cone vertical tube diffuser with slanted anti-siphon hole |
US20220186981A1 (en) * | 2020-12-11 | 2022-06-16 | Rheem Manufacturing Company | Water heating system |
US20230099397A1 (en) * | 2021-09-29 | 2023-03-30 | Rheem Manufacturing Company | Heat trap apparatus for water heater |
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US2784291A (en) * | 1955-02-11 | 1957-03-05 | William M Harney | Water heating device |
US3715566A (en) * | 1972-01-24 | 1973-02-06 | Smith Corp A | Corrosion guard system for electric water heater |
US3776456A (en) * | 1972-04-21 | 1973-12-04 | Smith Corp A | Direct fired water heater thermal compensating dip tube |
US4419567A (en) * | 1981-03-02 | 1983-12-06 | Apcom, Inc. | Heating element for electric water heater |
US4898150A (en) * | 1989-03-10 | 1990-02-06 | Gsw Inc. | Pressure balancing water heater dip tube turbulator attachment |
US5054437A (en) * | 1990-07-20 | 1991-10-08 | Kale Hemant D | Storage tank for water heaters and the like with collector outlet dip tube |
US5168546A (en) * | 1990-11-28 | 1992-12-01 | Hydro-Quebec | Device for heating the bacterial proliferation zone of a water heater to prevent legionellosis |
US5317670A (en) * | 1991-10-19 | 1994-05-31 | Paul Elia | Hot water storage system |
US5341770A (en) * | 1993-03-26 | 1994-08-30 | Bradford-White Corporation | Integral lime inhibitor |
US5596952A (en) * | 1995-07-24 | 1997-01-28 | Bradford White Corporation | Indirect water heater |
US6138614A (en) * | 1999-02-01 | 2000-10-31 | Aos Holding Company | Inlet tube for a water heater |
US6282372B1 (en) * | 2000-04-11 | 2001-08-28 | Rheem Manufacturing Company | Multi-position point of use electric water heater |
US6370328B1 (en) * | 1997-10-08 | 2002-04-09 | Bernard J. Mottershead | Water heating tank with thermosiphonic circulation for improved heat recovery rate |
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US6053130A (en) * | 1998-06-04 | 2000-04-25 | American Water Heater Company | Power vent water heater with electronic control system |
-
2005
- 2005-10-05 US US11/243,542 patent/US7203418B1/en not_active Expired - Fee Related
-
2006
- 2006-10-03 CA CA002561990A patent/CA2561990C/en not_active Expired - Fee Related
- 2006-10-04 MX MXPA06011504A patent/MXPA06011504A/en active IP Right Grant
- 2006-10-08 CN CN2006101400115A patent/CN1945154B/en not_active Expired - Fee Related
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US2784291A (en) * | 1955-02-11 | 1957-03-05 | William M Harney | Water heating device |
US3715566A (en) * | 1972-01-24 | 1973-02-06 | Smith Corp A | Corrosion guard system for electric water heater |
US3776456A (en) * | 1972-04-21 | 1973-12-04 | Smith Corp A | Direct fired water heater thermal compensating dip tube |
US4419567A (en) * | 1981-03-02 | 1983-12-06 | Apcom, Inc. | Heating element for electric water heater |
US4898150A (en) * | 1989-03-10 | 1990-02-06 | Gsw Inc. | Pressure balancing water heater dip tube turbulator attachment |
US5054437A (en) * | 1990-07-20 | 1991-10-08 | Kale Hemant D | Storage tank for water heaters and the like with collector outlet dip tube |
US5168546A (en) * | 1990-11-28 | 1992-12-01 | Hydro-Quebec | Device for heating the bacterial proliferation zone of a water heater to prevent legionellosis |
US5317670A (en) * | 1991-10-19 | 1994-05-31 | Paul Elia | Hot water storage system |
US5341770A (en) * | 1993-03-26 | 1994-08-30 | Bradford-White Corporation | Integral lime inhibitor |
US5341770B1 (en) * | 1993-03-26 | 1998-09-22 | White Bradford Corp | Integral line inhibitor |
US5596952A (en) * | 1995-07-24 | 1997-01-28 | Bradford White Corporation | Indirect water heater |
US6370328B1 (en) * | 1997-10-08 | 2002-04-09 | Bernard J. Mottershead | Water heating tank with thermosiphonic circulation for improved heat recovery rate |
US6138614A (en) * | 1999-02-01 | 2000-10-31 | Aos Holding Company | Inlet tube for a water heater |
US6282372B1 (en) * | 2000-04-11 | 2001-08-28 | Rheem Manufacturing Company | Multi-position point of use electric water heater |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1840481A1 (en) * | 2006-03-30 | 2007-10-03 | Bradford White Corporation | Apparatus and method for introducing and drawing water in a water heater |
US20070227468A1 (en) * | 2006-03-30 | 2007-10-04 | Bradford White Corporation | Apparatus and method for introducing and drawing water in a water heater |
CN101373083B (en) * | 2007-08-21 | 2011-06-08 | 中山市爱美泰电器有限公司 | Time-sharing layered cyclic heating water tank |
NO20191315A1 (en) * | 2019-11-04 | 2021-05-05 | Oso Tech As | A water heater |
NO346322B1 (en) * | 2019-11-04 | 2022-06-07 | Oso Tech As | A water heater |
Also Published As
Publication number | Publication date |
---|---|
CA2561990C (en) | 2009-11-24 |
MXPA06011504A (en) | 2007-04-09 |
CN1945154A (en) | 2007-04-11 |
CA2561990A1 (en) | 2007-04-05 |
CN1945154B (en) | 2010-11-03 |
US7203418B1 (en) | 2007-04-10 |
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