POTABLE WATER HEATER
A water heater for heating potable water used in a boat or vehicle has operating components which are easily accessible from one end of the heater. The heater further includes a water level sensor to indicate water quantity and a coolant stack which terminates in an exhaust stack which can have either of two configurations for installation flexibility.
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This application is a division of application Ser. No. 10/848,780, filed May 18, 2004, currently pending, and entitled IMPROVED POTABLE WATER HEATER.
INTRODUCTIONThis invention relates to a improved hot water heater and, more particularly, to an improved hot water heater for marine or vehicle use and which utilises diesel fuel for heating potable water and which heater utilises the exhaust of the burner to improve the efficiency of the heating process.
BACKGROUND OF THE INVENTIONHot water heaters for heating potable water for use in cooking, showers, baths and the like, and which potable water heaters are used in recreational vehicles, boats, motor homes and other vehicles are, of course, well known. The fuel typically used in such heaters is electric power or propane. The disadvantages in using propane are well known since propane is maintained in its liquid state by a pressurized storage vessel. In a boat, the gas, being heavier than air, will accumulate in the lower portions of the boat in the event there is a leak. The fuel is volatile and if it is ignited, an explosion may occur. More mundane considerations include the fact that propane fuel is not readily available. Statutes and local regulations may require that such fuels be stored under stringent conditions and commercial outlets are therefore not always at hand.
Yet a further consideration is the efficiency of the potable water heater itself. In a boat or vehicle, the space available for a water heater is at a premium. It is desirable to have the water heater take up a relatively small volume.
SUMMARY OF THE INVENTIONAccording to one aspect of the invention, there is provided a hot water heating system with a burner and operating components associated with said burner, said burner and said operating components being located within a housing, said operating components being located at and accessible form one end of said heating system upon removal of a portion of said housing.
According to a further aspect of the invention, there is provided a coolant level sensor in a heated coolant and diesel powered heater, said coolant level sensor producing a signal when said coolant within said heater is beneath a predetermined level, said signal being operable to terminate operation of said heater.
According to yet a further aspect of the invention, there is provided a coolant heater for heating coolant and circulating said heated coolant through a boat, vehicle or other living area, said coolant heater comprising a coolant stack carrying gases from a burner, said coolant stack being located within a coolant jacket and said coolant stack terminating in an exhaust stack releasing said hot gases to the atmosphere, said coolant stack being in a configuration that allows said exhaust stack to exit said water heater at least two exhaust stack exit locations.
Specific embodiments of the invention will now be described, by way of example only, with the use of drawings in which:
Referring now to the drawings, the potable water heating system is generally illustrated at 100 in
The heating system 100 includes an exhaust jacket 103 surrounding the burner 101 which exhaust jacket 103 conveys hot exhaust to an exhaust manifold 104 and thence to a stack 110 which releases the hot gases to the atmosphere, the direction of flow of the hot exhaust being illustrated by the arrows.
A potable water jacket 110 surrounds the burner 101 and carries potable water. Cold potable water enters the water jacket 110 at cold water inlet 112 (
An electrical or resistance element 114 is inserted into the water jacket 110 from the end as illustrated in
The heating system 100 is pressurized; that is, the heating system 100 is a closed system. As such, there are forces acting on the end portions 120, 121 of the water jacket 110. The end portions 120, 121 are each generally convex on the outside surface and concave on the inside surfaces 126, 127 which inside surfaces 126, 127 are exposed to the potable water under pressure in the water jacket 110.
A water level sensor generally illustrated at 130 (
Referring now to
In operation, ignition of the fuel and air will take place as is usual, such as with the use of an ignition electrode (not shown) and a combustion flame 122 will appear in the burner tube 101 from the combustion of the pressurized air and fuel combined in the nozzle 102 (
Thus, it will be seen that the heat from the exhaust gases are used to heat the exhaust manifold 104 which manifold is in contact with the potable water within the heater 100. Additional heat is therefore provided to the potable water through the exhaust manifold 104 which, because of its location within the potable water jacket 110, will enhance the heating of the potable water prior to the exhaust gases being released to the atmosphere and improve the efficiency of the burner. A further advantage is that the stack temperature will be reduce because heat in the exhaust gases will be transferred to the potable water before the exhaust gases reach stack 100.
Because the water is under pressure within the water jacket 110, the force of the water will act against the end portions 120, 121 of the water heater 100. This force may be intermittent with the result that cyclical stress arises. It has been found that having the end portions 120, 121 assume a convex outside configuration and a concave inside configuration will reduce the amplitude of the cyclic stress on heater 100. The forces acting on the end portions, therefore, are better absorbed by the housing of the heater 100.
Access to the operating components associated with the combustion in heater 100 is conveniently provided by the removable side and end panels 140, 142 respectively (
A further embodiment of the invention is illustrated in
A second pump 172 and an associated aquastat 173 are provided to pump the potable water heated within the potable water heater 100 through the heat exchanger 163 thereby to exchange heat with the glycol mixture circulating through the zone heater 161. The pumps 164, 171 are initiated by a thermostat located in the zone serviced by the zone heater 161.
Reference is now made to
Many modifications will readily occur to those skilled in the art to which the invention relates. For example, although the exhaust stack is shown to be in a rectangular configuration as viewed in
It is further contemplated that the potable water heater according to the invention may conveniently be used in a living environment other than in marine or vehicle use. Such a heater requires initial power to initiate the combustion flame but, following that ignition, the heater could operate on minimal power or the energy generated by the heater could be used to produce the necessary power for continued operation.
Many further embodiments will readily occur to those skilled in the art to which the invention relates and the particular embodiments described are given by way of example only and are not intended as limiting the scope of the invention as defined in accordance with the accompanying claims.
Claims
1. A hot water heating system with a burner and operating components associated with said burner, said burner and said operating components being located within a housing, said operating components being located at and accessible form one end of said heating system upon removal of a portion of said housing.
2. A hot water heating system as in claim 1 wherein said operating components include a burner assembly, a compressor, a combustion fan and a fuel pump.
3. A hot water heating system as in claim 2 and further comprising a hot water outlet and a cold water inlet located at said one end of said heating system.
4. A hot water heating system as in claim 3 which utilises a coolant and further comprising a coolant level sensor which produces a signal when said coolant within said heater is beneath a predetermined level, said signal being operable to terminate operation of said burner.
5. A hot water heating system as in claim 4 wherein coolant replaces said water, said heater circulating said heated coolant through a boat, vehicle or other living area, said heater comprising a coolant stack carrying gases from a burner, said coolant stack being located within a coolant jacket and said coolant stack terminating in an exhaust stack releasing said hot gases to the atmosphere, said coolant stack being in a configuration that allows said exhaust stack to exit said water heater at least two exhaust stack exit locations.
6. A coolant level sensor in a heated coolant and diesel powered heater, said coolant level sensor producing a signal when said coolant within said heater is beneath a predetermined level, said signal being operable to terminate operation of said heater.
7. A coolant level sensor as in claim 6 wherein said coolant is water.
8. Coolant heater for heating coolant and circulating said heated coolant through a boat, vehicle or other living area, said coolant heater comprising a coolant stack carrying gases from a burner, said coolant stack being located within a coolant jacket and said coolant stack terminating in an exhaust stack releasing said hot gases to the atmosphere, said coolant stack being in a configuration that allows said exhaust stack to exit said water heater at at least two exhaust stack exit locations.
Type: Application
Filed: Jan 22, 2012
Publication Date: Jul 19, 2012
Applicant: INTERNATIONAL THERMAL INVESTMENTS LTD. (Richmond)
Inventor: EDGAR C. ROBINSON (Vancouver)
Application Number: 13/355,551
International Classification: F24H 9/20 (20060101); F24H 1/24 (20060101);