US2342500A

US2342500A - Fluid heater

Info

Publication number: US2342500A
Application number: US314877A
Authority: US
Inventors: Harrison D Sterick
Original assignee: Individual
Current assignee: Individual
Priority date: 1940-01-20
Filing date: 1940-01-20
Publication date: 1944-02-22
Anticipated expiration: 1961-02-22

Description

F eb. 22, 1944,

H. D. sTERlcK FLUID HEATER Filed Jan. 2o, 1940 2 Sheets-Sheet 1 Feb. 22, 1944. H. D. STI-:RICK v 2,342,500

FLID HEATER A Filed Jan. 20, 1940 2 Sheets-Sheet 2 INVENTOR. Alu/mw., 9 W

fu; ATToR/vsxs.

Patented Feb. 22, 1944 UNITED STATES PA'I'EIWI4 .OFFICE Y 2,342,500 E I y rnmnrnm'r imL l Harrison Sterick, Pittsburgh, Pa. application january 20, 1940, serial No. 314,877

11 oiaims.' (o1. y122-250) This invention relates to fluid heaters, and is more particularly concerned with Water heaters of the instantaneous type, and with combination heaters adapted tovsupply hot water to a faucet system and concurrently or intermittently supply hot water at a higher temperature to a heat radiating system. l l

Heretofore it has beenthe standard practice in homes, offices, factory buildings, and the like to have one heater for heating the hot Water which comes from the faucets, and a second heater for heating the hot Water to be supplied to radiators or other heat radiating system. This practice requires separate burners, boilers, and heat exchange means and is obviously expensive. Again, the ordinary hot water heater which employs gas is often inefhcient and much of the useful heat iny the burnt gas may go vup the chimney or be Wasted in other Ways. For example, it is usually impossible to place ones hand on the outside of a Water heater, which means that heat is'escaping directly by radiation, conduction and convection from the water heater. Moreover, the usual Water heater of the instantaneous type is particularly inefficient in that a large volume of gas is burnt quite rapidly adjacentva relatively small body of Water without adequate heat vtransfer means being provided so as to prevent escape of useful heat.

The usual Water heater, Whether for heating faucet Water or radiator and 'the like water,` is generally open to the objection that the heat exchange means are placed directlyl in the flames or adjacent otherheating means so that deposits of soot and the like occur on the heat exchange means which reduces their eiliciency. Stillagain,

` the ordinary heat exchangemeans is not properly constructed Aorarranged so as to reffect the greatest degreeof heat transfer, and as a result it often becomes necessary to use heat exchange conduits of considerable length with the attendant-increase in heater costs. Further, many heaters are complicated `to install and maintain in operationV or are bulky and undesirable for other reasons.

It is the general object of my invention to I avoid and overcomey the foregoing and other dii-Q culties attending the manufacture, maintenance and use of fluid yheatersby the provision of an improved, heater which `is .relatively simple and inexpensive, but which is .adapted to operatelat high efliciency overlongperiods of use substantially without attention.

Another. and more particular volojectof my invention is the provision of a fluid heater, and

particularly awater heater, which is adapted to supply fluid or water at two different temperatures from, a single apparatus whereby the requirements for faucet water and heat radiating fluid can be supplied with a minimum of expense. y

Another object of myinvention is the provision of a rugged, long-lived, inexpensive, eiiicient, and easily installed and maintained hot Water heater having a single heating chamber, heating means, and heat exchangemealns adapted to supply Wter at two different desired temperatures. p

Another object of my invention is the provision of, a fluid heater, such as a Water heater, in which theheat exchange means, are so constructedy and aranged as to utilize substantially all of the heat inherent in the heating. means with little-or -no dissipationor loss of heat beyond that requisite to obtaink a stack draft.

Another objectof my invention is the provision of anv improved fluid heater including thermostat control for automatically maintaining the relation between the heating means and the iluid outletreg'ardless o f whether the heater is employed to supply fluid at a plurality of different temperatures.

l 'I'he foregoing and other objects of myinvention are achieved by the provision of a fluid heater comprising a heating chamber, heating meansln'th'e chamber, heat 'exchange' means -associated with the heating chamber, a conduit connected' to one portion of the heat exchange means and adapted to extend to a faucet Vpiping system, a second conduitv connected "to another portion of theyheat exchange means' and adapted to extend toa heat radiating system, a third conduit connected to the 'first conduit and Y adapted to extend to the return from a heat radiating system; and a thermostat associated with the heat exchange means for turning on the `heating means when-the' return fluid from the radiating system is too cold or when the outletfluid to'the faucet system is too cold.

In accordance with the objects of my invention I `provide a fluid heater comprising a vheating chamber, heating means positioned adjacent the bottom lof the heating chamber, a conduit of substantially helical shape surrounding the heating chamber and adapted :tobe connected at its bottom end to a cold iiuid supply, heat exchange meansy inside the heating chamber, a connection between the heat exchange means andthe upper end of the' conduit,- an outlet conduit connected to the heatiex'change means and adaptedtobe connected to 'a vpiping system, and'v a thermostat associated with the outlet conduit and adapted to turn on the heating means when the fluid passing out of the outlet conduit falls below a desired temperature.

For a better understanding of my invention reference should be had to the accompanying drawings wherein Fig. 1 is a vertical cross-sectional view of one embodiment of a combination heater constructed in accordance with the principles of my invention; Figs. 2 and 3 are views similar to Fig. 1 of modified forms of combination heaters; Figs. 4 and 5 are vertical crosssectional views of two embodiments of iluid heaters which do not incorporate the combination feature; Fig. 6 is a vertical cross-sectional view of still another embodiment of my invention; and Fig. 7 is an enlarged vertical cross section through the injector that may be used with the apparatus disclosed herein.

My invention is particularly concerned with using gas in various forms to heat water. However, I broadly contemplate using other heating means than gas, and I contemplate heating other uids than water, and the following description and claims should be read with this in mind.

Referring to Fig. 1 of the drawings, the nu* meral I indicates an outer housing usually provided with a suitable skirt or legs I2 adapted to support the housing on the floor and having a hood or top cover I4 formed with an approprate opening I6 adapted to be connected to a flue, chimney or the like. Usually, I form the housing III or a cylindrical shape, although it will be understood that the housing may be square or polygonal, as desired. Preferably, a lining I8 is supported inside of the housing III, as by channels 20, so as to provide an air space between the lining I and the housing It'. Holes 22 may be formed in the upper ends of the housing lil to permit circulation of air between the housing I0 and the lining It. This acts as a back air vent. The housing I0 and lining I8 are generally formed of sheet metal or plate, but

obviously can be made from cast metal or other y! materials if this is found to be preferable.

Positioned to the bottom of and centrally of the housing I'is a heating chamber or lire box 25 which is preferably of a truncated conical form and which is covered .at its upper end with a cap 2B having a central aperture 3U therein. The bottom of the heating chamber 26 is open and is positioned directly above heating means 32 which ordinarily takev the form of a gas burner of any suitable construction. The heating means 32 may be secured in position in any suitable manner as, for example, by the use of angles :t4 which are fastened to the legs I2. The bottorn of the heating chamber 26 is formed with a sweat pan 36 at its outer periphery and this may be readily accomplished when the heating chamber 26 is made of sheetor plate metal by merely turning up the metal to form a gutter or pan in the manner illustrated in the drawings. The heating chamber 26 is secured to the bottom of the lining I8 adjacent the angles 34.

I preferably provide a boiler 49 inside the housing I!) and usually the boiler 40 takes a square or cylindrical form of approximately the area of the top of the heating chamber 25 and of a height substantially equal to its width. The boiler 4I! is mounted inside of the housing in a position directly above the top of the. heating chamber 25 so that hot gases escaping out of the opening in the cap 28 flow over the bottom and sides of the boiler as will be under` stood.

Heat exchange means usually in the form o a substantial helical or truncated conical coil 42 are provided on the outer surface of the heating chamber 26. The lower end of the coil 42 is adapted to be connected by a conduit 44 with a source of cold fluid or cold water supply. The coil 42 may be flattened slightly or may even be embedded in grooves formed on the outer surface of the heating chamber so as to insure the most intimate type of Contact between the coil and the heating chamber to thereby effect the best possible type of heat transfer between the heating chamber and the fluid in the coil 42.

Usually, I wind the conduit forming coil 42 onto the heating chamber 26 under tension so that the conduit is not only ilattened but remains under tension whereby changes in temperature do not loosen the conduit or destroy the intimate heat exchange relation between the coil and heating chamber.

The upper end of the coil 42 is connected by a conduit 4t with the boiler 4I! and is also connected to heat exchange means positioned around the boiler. Preferably, the heat exchange means around the boiler take the form of a plurality of spirally wound flat coils 48 which are connected to each other and positioned one above the other in the manner shown in Fig. 1. The coils 4B are, of course, subjected to any hot gases owing out of the opening 30 in the top of the heating chamber 26 and the coils may be formed in any known manner to facilitate the greatest heat exchange between the hot gases and the fluid passing through the coils. For example, I have illustrated the coils 48 in the drawings as including a substantially vertically extending iin 50 on each of the individual convolutions forming the coil, and it will be understood that additional iins extending either circumferentially, longitudinally or helically can be used if desired.

The bottom of coil 48 is connected by a conduit 52 to a spirally wound coil 54 positioned in the top of the heating chamber 25. The coil 54 is formed with heating fins 56 in the manner illustrated. The end of the coil 54 not connected to the conduit 52 extends to a conduit 58 coiled substantially helically or in a truncated conical manner in the inside of the heating chamber 26. The bottom end of the conduit 58 is connected to a conduit tu which is adapted to be connected to a faucet piping system, as, for example, to supply hot water for home use. A thermostat, indicated as a whole by the numeral 62, is connected in the conduit 58 and is provided with an operating shaft G4 which extends to the outer surface of the housing I0 so that the exact operating temperature of the thermostat can be set from the outside of the housing.

The top of the boiler 4U is provided with a manifold 68, only the branch pipes of which are shown but which is adapted to be connected, as by a conduit lIII, to a heat radiating system, as, for example, the usual radiators in a househeating system. The return conduit from the heat radiating system is indicated by the numeral 'I2 and is connected to the conduit Ell preferably with a suitable injector mechanism, indicated by the numeral i4 and illustrated in detail in my prior Patent No. 2,033,260. The im iector is also shown in Fig. 7 of the accomanying drawings. When water is not being withdrawn from the system through: the house faucets the water in the house heating system returns through pipe 12 (Fig. 1) and passes through the curved pipe 11 in the injector and. into conduite!! where the water is reheated.

When a faucet (not shown) connected to pipe 19 is opened the water in conduit 60 will reverse its direction of flow and pass out of the lower end of the conduit through` perforated disc 18 rigidly mounted in any suitable manner in the end of the conduit. The force of this water flowing against the open lower end of curved tube 11 and around the lower portion of that tube to pipe 19 stops water in return line 12 from issuing from the curved tube while the faucet is open, whereby the water in the house heating system is not mixed with the water being drawnfrom the faucets. Usually, the use of an injector of some type is advisable so as to prevent the mixing of the radiator water with the faucet water, but I have found that injector mechanism is not always necessary. I may include an agitator or circulating means 16 in the conduit 12 so as to render positive the circulation of fluidor Water through the heat radiating system.

In the operation of the embodiment of my invention just described assume that the thermostat 62 is set for a temperature of 140 `l1". and the water or other fluid present in the system is relatively cool and below 140 F., having just been fed into the system through the inlet con f duit 44. Then, the heating means or burner 32 will be turned on automatically rand het gases flowing up inside of the heating chamber 26 will heat the fluid in the

coils

42, 48 and 54 and the fluid in the boiler 4B and in the conduits 58. The heating of the fluid bythe heating means 32 will continue until the returny fluid coming back from the radiating system through the conduit 12 and into the conduit 58 will be above a temperature of 140 F., then the thermostat will function to turn off the heating means. The ow of fluid in this system will be, of course, through conduits 12, B0, 58, through heating coil 54, heating coils 48, the boiler 40, and the conduit or conduits 10. This heating system can continue to furnish the heat desired in accordance with the thermostat control which will go on and offin the manner explained so as to give a temperature in the rooms heated by the radiating system which is as desired. The control shaft 5,4 for the thermostat may be extended or coupled to any suitable control mechanism whereby the exact heating characteristics of the apparatus can be controlled from a distance.

It will be understood that the hot fluid or water flowing to the heat radiating system from conduit will be at a temperature considerably above 140 F. and usually is in the neighborhood of 180 to 190 F. This is because the thermostat which controls the operation yof the heating means is in turn controlled by the temperature of the fluid or water returning from the heat radiating system and after the fluid has transferred its heat to the radiating system. The hot gases from the heating means 32 flowing up through the heating chamber 26 at the opening and up and around the boiler 40 and coils 48 and thence out the stack I6 will, of course, result in considerably higher temperature in the fluid in the boiler than the fluid in the return conduit 12. In this connection, it will be noted that I have provided heat exchange means of such a construction and arrangement that substantiallyevery bit. of heat in the hot gases is transferredto the fluid or water carried in the coils and conduits. In this manner I obtain a relatively high efficiency, and in fact by controlling the number of coils and the flow .of gases over the coils I am able to obtain heat transfer lefficiencies of per cent or more of the actual heat present in the gas or other form of energy supplied to `the heating means. VIn the past high efficiencies have not been reached for the reason that the proper stack draft could not be maintained with too high an eiciency. I have found that I can maintain an adequate stack draft even with high efficiencies, and while avoiding any undesirable sweating for the reason that any sweating which does occur in my apparatus results in a trapping of the fluid in the sweat panvBBat the bottom of the heating chamber where the sweat is evaporated during the inoperative periods of the heating means.

When the apparatus described is usedA to supply hotwater or hot uid to a faucet system the faucet system is opened which allows fluid or water to flow out of the conduit 60. This loss of water in the system is compensated for by the inflow of cold water through the inlet conduit 44. So long as the water flowing past the thermostat 62 and out of the outlet conduit 60 is above a temperature of 140 F. the heating means 32 is turned off. However, when the temperature of the fluid drops below F. the heating means 32 is turned on. This results in a heating of the fluid or water in the coil 42, the coils 43, the coil 54, and the conduit 58. Once the temperature of the water is brought up above a point of 140 F. the burner is again shut off. I have found that my apparatus can be` used as an instantaneous heater, namely, that water can be drawn continuously from the conduit t0 for long periods without the temperature of the water falling below approximately 140 F. In this operation of my apparatus the water or fluid in the heat radiating system will not be affected or drawn into the faucet system, due to the action of injector 14. Also, any interruption in the normal functioning of the heat radiating system is in ordinary use of such a temporary character that it can be forgotten.

The exact temperature of the water supplied for the heat radiating system and the water or fluid supplied for the faucet system may be controlled not only by changing the operating characteristics of the thermostat 62 but by changing the position of the thermostat in the conduit 5t. More particularly, in a combination heater of the type above and hereinafter described, the temperature of the heat radiating water and the temperature of the faucet Water is directly dependent upon the length of the conduit 58, the position and size of the coils 48 and 54, the heat transfer characteristics thereof and the position of the thermostat 62 in the conduit 58 and th'e relation of the thermostat to the faucet conduit 50 and to the heat radiating conduit 1t. The closer the thermostat is to the faucet conduit 60 the greater the temperature difference between the faucet and heatingr radiating waters. The closer the thermostat is'to th'e heat radiating conduit 10 the less temperature difference between faucet and heat radiating waters. It will be understood that by properly coordinating the position of the thermostat, the lengths, positions and heatv exchange characteristics of the conduits and coils mentioned the exact temperatures for faucet andheat radiating Waters can be obtained. l

The structure and operation of the embodiment of my invention illustrated in Fig. 2 is generally similar to that describedv in detail above in conjunction with' Fig. l. Briefly, the apparatus of 2 includes an outer housing 8B, an inner housing d2, a heating chamber Bil, a burner Se, and a boiler 8&1. A substantially helical coil se wrapped tightly around the heating chamber El! and connected at its lower end to a cold water supply has its upper end connected by a conduit et to the bottom of the boiler 33, and lil e wise to the inside of a substantially spiral coil Gli which in turn is connected through a conduit to and a thermostat lilil to a conduit 552 extending to a faucet system and to the return |04 from a heat radiating system. An injector mechanism may be employed at |633 to insure the return of the water from the heat radiating system al1 in the manner heretofore described.

The coil lid is formed with a plurality of heat transfer fins m6 which as heretofore stated may take the form of circumferential, longitudinal or helical fins or which may comprise a plurality of relatively small wire-like fingers cut from the individual conduits of the coil and extending out from the surface thereof substantially in the form of wire iingers. A baffle lll secured to the bottom of the coil 96 causes the hot gases from the heating means to flow over substantially the entire surface of the coil of the boiler 88 is formed with a manifold lill which is adapted to be connected to a heat radi-- ating system.

This form of my :invention operates in a man-- ner very similar to that already described iu ccn- .lunction with l of my invention, and is particularly characterized being able to be readily drained, which is sometimes desirable. 'bottorn of the firing chamber 34 may formed with a suitable sweat box H2, as will be understood.

The embodiment of my invention shown in Fig. 3 includes an outer housing 52d, an inner housing 22 forming a heating chamber and having heating means i24l positioned at the bottoni thereof. A coil l2@ wrapped tightly around the inner housing |22 and connected to a cold Water inlet 128 at its bottoni end extends in suhstantially helical form up between the inner and outer housings and is connected to the top of a helical coil lEs positioned at the incide and upper end of the inner housing |22. The bottoni end of the coil |29 extends through a thermostat lili! to an outlet conduit it adapted to be connected to a faucet system. A baliie |34 of square or cylindrical shape is positioned inside of the coil which coil is usually formed with suitable fins t insure the 1.cest type of heat transfer. The upper end of the coil l2A is connected by a conduit l 36 with` a heat radiating system, a conduit its adapted to be connected to the return conduit from the heating system is connected to the outlet conduit |32 in the manner .illustrated in the drawings.

The operation of this embodiment of niy invention believed to be fully understandable from that already set forth above in conjunction with l of my invention.

In Fig. 4 have illustrated a simple water heater which does not provide Water or other fluid heated to two different temperatures. In this form of my invention the numeral |42 indiouter housing which surrounds in spaced relation an inner housing and heating chamber |44 in the bottom of which is positioned a heat- The top aecasoo ing means |45. A conduit substantially in the form of a helical coil |48 and having its lower end connected to a return pipe |50 extends vertically through the heater between the outer housing |42 and the inner housing |44 and is secured in intimate relation with the inner housing. The upper end of the coil Hi8 is connected by a conduit |52 to the upper end of a helically wound coil |54 which is provided with suitable heat transfer ns |55. The bottom end of the coil |55 is connected, as at |51, to a storage tank ll) which is positioned inside of the coil |54.

A stand pipe |50, extending from the boiler |58, is connected to the inside of a substantially spiral coil |62 formed with suitable heat eX- change ns |64 and having its outer end connected through a thermostat |56 to an outlet conduit I. The thermostat IEB may be positioned in the boiler |58 if desired. A by-pass conduit |l connected to the boiler |58 and the outlet conduit Hit insures circulation of water through the boiler when the water in the boiler is being brought up, without withdrawal from the system, to the necessary temperature to operate the thermostat and shut oll the heating means Ulli. Bailies |72, |14 and 'iii control the flow of hot gases over the coil |62 and around the bottom of the boiler |58. A helical baille l positioned between the boiler |53 and the inner housing Mil causes a helical flow of hot gases over the coil |54 and over the outer surface ol the boiler |58.

This particular embodiment of my apparatus is adapted to heat either a radiator or other heat radiating system or it may be used to heat hot Water for a faucet system, in which case the corn duit |58 is merely connected to the cold water inlet and the conduit |68 is connected to the hot water faucet system.

The embodiment of my invention shown in inner housingr |92 of substantially cylindrical or Fig. 5 comprises an outer housing |50 and an slightly conical shape with the inner housing serving as a heating chamber which has a burner |94 or other heating means positioned at the bottom of the heating chamber. A cap |96 closes the top of the outer housing |93 and is provided with an aperture ist adapted to be connected to a chimney or stack. Heat exchange means, usually in the form of a coil 260 of substantially helical shape, is positioned between the outer housing ISI) and the inner housing |92 in intimate heat transfer relation with the inner housing. The bottom of the coil 20|) is connected to a cold water inlet conduit 292. The top of the coil 2GB is connected to heat exchange means positioned in the inside of the inner housing |92 near the top thereof. Preferably these heat exchange means take the form of a helical coil 2li-l provided with suitable fins ZEE which facilitate the heat exchange between the water carried by the coil and the hot gases which flow over the coil.

A baille or boiler 288 is positioned centrally of the top of the inner casing 204 so that the hot gases owing up from the heating chamber are directed to iiow over the convolutions of the coil 20e. I contemplate employing a wet boiler in this position which may be connected to the coils in the manner already described in conjunction with the previous embodiments of my invention. However, I have illustrated a dry boiler which is not connected into the coils or conduits in any way with the boiler serving merely as a baille. The bottom of the coil 204 is connected to a thermostat 2l0, which in turn is connected to a conduit 2|2 and which is adapted to be connected to the hot Water or faucet system in any given installation. Of course, I may employ the heater illustrated in Fig. 5 as a house heater or a heater for heating water used in a heat radiating system, and in this case the conduit 2|2 leads to such a heat radiating system and the conduit 202 is connected to the return conduit from the system with any suitable means being used to bleed additional water into the system as infrequently required.

Ihe operation of this embodiment of my invention is quite similar to the operation of the forms of my invention already described. Sufce it to say that the heating means |94 are only turned on when the water passing out of the coil 204 over the thermostat 210, and out of the conduitr 2l2, falls below the temperature at which the thermostat is set to operate. When the water becomes hotter than this temperature the heating means is turned off. The outer housing of this form of my invention is kept quite cool in operation and the desired per cent of heat from the gas or other operating means can be absorbed by the heat exchange means provided so that fluid, and particularly water, of the desired temperature can be obtained. This heater, like substantially all of those previously described, may be used as an instantaneous heater to raise water to any temperature desired.

The form of my invention illustrated in Fig. 6

includes a housing 250 having a cap 252 closing the top and formed with a central aperture 254 adapted to be connected to a stack or flue (not shown). A heating means, usually in the form of a gas burner 256, is positioned centrally of and at the bottom of the housing. An appropriately finned substantially helical coil 258 closely surrounds the inside of the casing and is connected at its bottom end to a conduit 260 adapted to be connected to a cold water inlet. Appropriate fnning on the coil 258 preferably takes the formv of a large plurality of integral wire-like lingers cut from the coil conduit and extended radially thereof. However, other nning means of satisfactory character may be used for fins, as will be obvious.

The top end of the coil 258 is connected to a boiler 262 positioned centrally of the top of the housing and the boiler has -one or more manifold connections 264 adaptedto be connected to a heat radiating system. A cylindrical baille plate 266 may be secured to the bottom of the boiler to assist in guiding the hot gases from the burner 256 over the coil 258.

A thermostat 210, adjustable from outside the housing 250, is secured in the coil. 258 approximately half way up its length and the thermostat, in accordance with known operating characteristics, is adapted to turn the burner 256 on when the temperature of the water flowing over the thermostat falls below a desired temperature and also acts to shut the burner 256 oir when the temperature of the Water flowing over the thermostat goes above a desired temperature.

The heater comprising this embodiment of my invention is also adapted to supply hot water to `a faucet system at a temperature below that at which it k.supplies the hot water for the heat radiating system. To this end, a conduit 212 is connected to the coil 258 in the manner and position illustrated and this conduit is adapted to be connected to a faucet system.

The present form of combination heater differs from that illustrated in Figs. 1, 2 and 3 and above described in that here the return from the heat radiating system instead of being connected to the conduit 212, as might be done, is connected with or without an injector, and by a conduit 214, to the cold water inletconduit 260.

The operation of this embodiment of my invention is substantially the same as the operation of the apparatus shown vin Figs. 1, 2 and 3 and will be readily understood from the description of the operation given above.

Of course, it should be understood that the various forms of my invention are adapted to be easily converted to radiating water heaters alone, faucet Water heaters alone, or combination heaters. However, the embodiment of my invention shown in Fig. 6 is particularly adapted to these three uses.

From the foregoing it will be recognized that the various objects of my invention have been achieved by the provision of relatively simple and l inexpensive apparatus which is easily installed,

operated and maintained, and which functions over long periods of time substantially without attention or repair to provide Water or other fluid at a desired temperature or temperatures. The size and cost of the heatv exchange means is kept at a minimum and the heat exchange means are removed from direct contact with the heating means so that'their lives and heat exchange characteristics are prolonged. Waste heat is' largely eliminated and my improved heaters can be operated at eiiciencies much higher than normally used or expected. I have provided adequate means to prevent sweating and have avoided the usual wastes of a heater of the instantaneous type. In accordance with my invention the same heating means, heating chamber, and heat exchange means are employed to heat both the fluid for water used in a heat radiating system, and the water used in a faucet 'system, thereby noticeably reducing the cost of such rise of about 60 F. or to meet other standard' requirements of heating or building codes or a'ssociations. to operate upon a smaller quantity of water, and larger units can be constructed to raise a greater number of gallons of water per minute through the desired temperature rise.

While in accordance with the patent statutes I have particularly illustrated and described my invention, it will be appreciated that I am not to be limited thereto or Athereby but that the scope of my invention is defined in the appended claims.

I claim:

l. A combined faucet water heater and radiating system Water heater comprising a heating chamber, heating means in the chamber, heat exchange means associated with the heating chamber, a conduit connected to one portion of the heat exchange means and adapted to extend to a faucet hot water system, a second conduit connected to another portion of the heat exchange means and adapted to extend to a heat radiat ing system, a third conduit connected to thefirst conduit by means of an injector and adapted to Of course, smaller units can be made extend to the return from a heat radiating system, and a thermostat. associated with the heat exchange adjacent the injector for turning on the heating means when the return waterfrom a radiating system is too cold or when the outlet water to a faucet system is too cold.

A combined faucet water heater andr radiating system water heater comprising a heating chamber, heating means in the chamber, heat exchange means associated with the heating chamber, a conduit connected to the heat exchange means and adapted to extend to a faucet hot water system, a second conduit connected to the heat exchange means and adapted to extend to a heat radiating system, a third conduit connected by means of an injector to the heat exchange means substantially adjacent the connection of the first conduit thereto and adapted to extend to the return from a heat radiating system, and means for turning on the heating means when the return water from a radiating system is too cool or when the outlet water to a faucet system is too cool.

3. A combined faucet water heaterl and radiating system water heater comprising a heating chamber, gas heating means in the chamber,

eat exchange means associated with both the outside and inside of the heating chamber, a conduit connected to one portion of the heat exchange means and adapted to extend to a faucet hot water system, a second conduit connected to another portion of the heat exchange means and adapted to extend to a heat radiating system, a third conduit connected to the heat exchange means substantially adjacent the connection of the first-named conduit thereto and adapted to extend to the return from a heat radiating system, a thermostat associated with the heat exchange means for turning on the heating means when the return water from a radiating system falls below a desired tempera.- turel or when the outlet water to a, faucet system falls below a desired temperature, the position of thel thermostat andthe size, location and heat exchange characteristics of the heat exchange means being such that the waters supplied to the faucet and heat radiating systems are at the desired temperatures, and means for supplying additional water to the heat exchange means when water is withdrawn by the faucet hot water system.

4. A fluid heater comprising a heating cham ber, heating means associated with the heating chamber, a boiler associated with the heating' chamber, a conduit adapted to be connected to the cold fluid supply and extending substantially in a helical coil around the heating chamber and connected to the boiler, a heat exchange conduit coil associated with the heating chamber and connected at one end to the boilerl and adapted to have its other end connected to a faucet hot water system, conduits connected to the boiler and adapted to extend to a heat radiating system, a conduit adapted to be connected to the returnV from a heat radiating system and connected to the heat exchange conduit coil adjacent the outlet adapted to extend toa faucet hot water system, and a thermostat in the heat exchange conduit coil adjacent the radiating system return conduit and the outlet to the faucet hot. water system so that the heating means are turned on Whenever the fluid flowing to the faucet hot water system or returning from the heat radiating system dro'psbelow a certain temperature.

acca-,50o

5. A fluid heater comprising a thin-walled heating chamber, gas heating means associated with the heating chamber, a boiler associated with` the heating chamber, a conduit adapted to be connected to the cold fluid supply and extend.- ing substantially in a helical coil around the outside of the heating chamber in intimate heattransferring relation therewith and connected to the boiler, a finned heat exchange conduit coil in the heating chamber and connected at one end to the boiler and adapted to have its other end connected to a faucet hot water system, conduits connected to the boiler and adapted to extend to a heatr radiating system, and a conduit adapted to be connected to the return from a heat radiating system and connected to the heat exchange conduit coil adjacent the outlet adapted to extend to a faucet hot water system.

6. A fluid heater comprising a heating chamber, heating means associated with the heating chamber, a boiler associated with the heating chamber, a conduit adapted to be connected to the cold fluid supply and extending substantially in a helical coil around the heating chamber and connected to the boiler, a finned heat exchange conduit co-il associated with the heating chamber and connected at one end to the boiler and adaptedto have its other end connected to a faucet hot water system, conduits connected to the boiler and adapted to extend to a heat radiating system, and. a conduit adapted to be connected to the return from a heat radiating system and connected to the heat exchange conduit coil adjacent the outlet adapted to extend to a faucet hot water system.

7. A fluid heater comprising a thin-walled heating chamber, heating means associated with the heating chamber, a boiler` associated with the heating chamber, a conduit adapted to be connected to the cold fiuid supply and extending substantially in a helical coil around the outside of the heating chamber' in intimate heat transferring relation therewith and connected to the boiler, a heat exchange conduit coil in the inside of the heating chamber and connected at one end to the boiler and adapted to have its other end connected to a faucet hot water system, conduits connected to the boiler and adapted to extend to a heat radiating system, a conduit adapted to be connected to the return from a heat radiating system and connected` to the heat exchange conduit coil adjacent the outlet adapted to extend to a faucet hot water system, and a thermostat in the heat exchange conduit coil adjacent the radiating system return conduit and the outlet to the faucet hot water system so that the heating means are turned on whenever the fluid owing to the faucet hot water system or returning from the heat radiating system drops below a certain temperature.

8'. A iiuid heater comprising a thin-walled heating chamber, heating means associated with the heating chamber, a boiler associated with the heating chamber, a conduit adapted to be conf nected tothe cold iiuid supply and extending substantially in a helical coil around the outside of' the heating chamber in intimate heat transferring relation therewith and connected to the boiler, a heat exchange conduit coil in the inside ofthe heating chamber and connected at one end to the boiler and adapted to have its other end connected to a faucet hot water system, conduits connected to the boiler and adapted to extend to a heat radiating system, a conduit adapted to be connected to the return from a heat radiattom of the heating chamber, a conduit of subing system and connected to the heat exchange conduit coil adjacent the outlet adapted to extend to a faucet hot water system, a thermostat in the heat exchange conduit coil adjacent the radiating system return conduit and the outlet to the faucet hot Water system so that the heating means are turned on whenever the uid owing to the faucet hot water system or returning from the heat radiating system drops below a ce1'- tain temperature, and means for positively circulating Water through the conduit adapted to be connected to the return from a heat radiating system.

9. A fluid heater comprising a heating chamber, heating means associated with the heating chamber, a boiler associated with the heating chamber, a conduit adapted to be connected to the cold iiuid supply and extending substantially in a. helical coil around the heating chamber and connected to the boiler, a heat exchange conduit.

coil associated with the heating chamber and connected at one endv to the boiler, a connection from the boiler adapted to extend to a heat radiating system, a conduit adapted to be connected to the return from a heat radiating systemand connected to the heat exchange conduit coiladjacent its end remote from the boiler, and a thermostat in the heat exchange conduit coil adjacent the radiating system return conduit `so that the heating means are turned on whenever the uid returning from the heat radiating system drops below a certain temperature.

10. A uid heater comprising a heating chamber, heating means positioned adjacent the botstantially helical shape surrounding the heating chamber and adapted to be connected at its bottom end to a cold fluid supply, a housing around the helical conduit and together with the heating chamber providing a back air vent, heat exchange means inside the heating chamber, a connection between the heat exchange means and the upper end of the conduit, an outlet conduit connected to the heat exchange means and adapted to be connected to a piping system, and a thermostat associated with the outlet conduit and adapted to turn on the heating means when the uid passing out the outlet conduit falls beloW a desired temperature.

11. A uid heater comprising a heating chamber, heating means positioned adjacent the bottom of the heating chamber, a conduit of substantially helical shape surrounding the heating chamber and adapted to be connected at its bottom end to a fluid supply, a :finned helicallycoiled heat exchange means inside the heating chamber, a dry baffle-boiler inside of the heat exchange means and serving to direct the ow of heat over the heat exchange means, a connection between the heat exchange means and the upper end of the conduit, an outlet conduit connected to the heat exchange means and adapted to be connected to a piping system, and a thermostat associated with the outlet conduit and adapted to turn on the heating means when the huid passing out the outlet conduit falls below a desired temperature.

HARRISON D. STERICK.