1,761,172 that an additional supply of air can be induced into the pipe li,ne either for. the purpose of increasing combustion or for assistit is so desired. 5 ipe 27, means escape from the @ipe 27. The usual form of gas burner 31 is pro10 vided which is positioned in the heating chamber below the. plate 12 and which ha-s cted theteto leads controlled by a e 35 connected 15 into the taiik 11 so that water from the tank 11, is brought into t-he thermostat 34. The purpose of the thermostat is to coiitrol the - temperature of the water. This thermostat is'of the usual 20 commercial form and is adapted to shut off the supply of gas leading to the burner when the water in the tank reaches,a predetermined temperature. @ The thermostat may, of course, be adjusted so as to decrease 25 the supply of gas flowing to th6 burner 31 or to shut it off entirely as may be'desired. A pilot light 36 is provided which is adapted to automatically light the gas entering the gas burnet 31 wheii the supply 3o there6f is shut ofF by the thermostat. A gkts supply pipe 37 is provided which leads t'o the valve 33 ftom any suitable-sou.ree of gas supply. A water inlet pipe 38 is provided which 35 extends longitudinally of the tank and terminates @ near the botto-m thereof just above the burner plate 12@ so that the cold water @ which is int.roduced into ihe tank h the pipe 38 is brought iiato contact 40 =gdiately with the plate 12 which, by reason of the flame therefrom g upward against th6 @late 12, is the =t part of the tank so that -this water is heated iquickly. as soon as it @ einters the tank. Am' 4z outlet pipe 39 is p@ovided having -"a T 40 secured thereto to which a water.eircul ]pi pe 41 is 'connected' and[ through = water is circulated t6 the bottom of 'the tank 11 as this pipe eiunds downwardly oii the bo outside of the tank 11 and there enters-the tank through the -side wall thereof, as :will be, seen by reference to Figure 1. flame pas'ses and because of the curvature of the pipe section 15, causes the flame to eddy or whirl into the bulb 16, retardina its -Dassage through the bulb 16. and allowinkthe water more time to abso@b @eat therefrom 70 thaia if the flame passed through the bulb. Th e curvature of the sides of the bulb is such that the.ilame does not channel therethrough, leaving cooled gases along the edgesof the bulb 16. The height to which 7r, the flame travels depends i:tpon the rate of 6ombustion OfL thegas, the amount of draft, and the temperature of the water in the heater. The products of combustion pass up -w@rd through the elbows 1,7 aAd the bulbs 80 16 passing'through the bulbs 16 with a wkirlino, or eddyiilg movement and into the heat tra-p 18 where they pass around the ends of the baffle plates and 6ut through the outlet pipe 23.' 'These @ases may be al- 85 lowed to escape to, a chimney or to the atmosphere through the,pipe 25 by ope . ning the, valve 26, or this valve may be closed and the valve 28 opened allowing the-products of combustion to 'ass into the pipe 2 00 p Under these conditions the travel of these ga . ses is very slow and the moist'ure therein is condensed as it passes downward, through the pipe 27, where it is allowed to eseape through the drip pipe, and the very small 95 quantity of gas remaining passe@ out thr6ugh the end of the pipe 27 under the burner plate 12. This gas has, no effect upon the gas combustion, because of the quantity of air which reaqhes the burner through the 100 open lower end of 'the tank 11. Whm degired., to iner@ase the capacity of the @pparatus, the pipe 26 is connected-to a chimney in 'a p ipp- line - eontaining an indiiction foan , in wh ch case the tank 11 a;nd heatin 105 r 9 elements should be @gteater i@' length than when used, as a watler heater onl'y for domestic purposes. If used as a part of a hot water heating system a pipe is connected to the pipe 39 which leads to the radiators and 110 thi@ inlet pipe, 38 is connected to the proper su ply or'@xpansion tank. p While I have d-escribed more or less precisely the cletails of construction, I do not wish to'be iinderstood as limiting myself 115 theret,6 as I cont ' late - ch@nges in forin emp and the proportion cif parts and the subIn operation, tho device is @ubstantially stitution , of equivalents as eircumstances may autom,atic aftei the pilot light is lighted. n d e r e x p e d i e n t w i t h p u t d e p a r t - 65 The thermostat controls the passage of gas sug r 120 to ih'e burner 31 and the quantity of in ggfersot 0 r hc s pirit o r s c op e o f . my inve-nti on. -gas I -supplied thereto, which is lighted. by the ght and I the flame from 1. A water heater comprising in combinathe gas - . and Pi'ot '@passes' upward against the curved tIOn@ OL burner @hell having water inlet'means burner )plate i2, and along the coriugat@cl water outlet means, a burner, a -burner PIRt6.125, surface of the plate and through the o,pen- haviiag an opemng therein, a coil in said ing 14 iiito the . pipe .15 and thence int6 the shell extending longitudinally thereof combulb 16 which, because o _ .. size @Posed ions Ecnd' bulbous seef its enlarged of curved se,et allows the flame to slow u@ in its movement tions alternately placed With relation to 65 knd is in effect a pocket, into which the e,ach other, a hea-t tritp, baffles in said heat 130
1,761,172 trap, and- an outlet pipe connected to said heat trap. 2. A water heater compi-ising a shell hav-. ing a combustion chamber and a water com-burner plate sep' ating partment therein, a ar the combustion chamber and the water compartment, said burner.plate having an opening, centrally thereof, a heating coil . con.@ nected to said burner plate and extending 10 splrally substantially throughout the length' of the Water compartment, said heating coil being coraposed of a plurality of bulbs with elbows connected to said bulbs, and an outJr let pipe through which the products of combustion escape from said coil. 3. A wat6r heater comprising EL shell having a combustion chamber and-a w.ater comp@artment,- therein, a burner 'plate separating, the. combustion chimber - and the water 20 COMPartment and:.having a central opemn therein, a heating coil connected at oide its. ends to sa4ld burner -plate and extendin @spirallysubstantiallythrougho-citthelengtfl of the water compartment, said heating coil 25 being composed of bulbs in spaced vertical relation with each other and efbows connecting the- bulbs at their ends, and an outlet pipe through which the.products of combustion escape from the said coil 30 4. A water heater comprising a shell having a. combustion chamber and a water compartment therein, im burner plate having an opening centrary thereof, a heating coil connected to said bumer plate and extend35 throughout the Said heata plura.lity of 'the said @bulbs, a heat trap in sai,cl watei ex40 tend,ing substAiltiaRy throug the entire cross i@e-etional area of sai.d snell, a pliirality of tra4sversely extending baffle plates in said, shell terminating short of the side wall thereof at one side, and an outlet pipe ex45 tending through said- shell and connected to said heat trap. Signed at Chicago, Illinois, this 26th day of April, 1927. JOHN D. TETTS. 50 60
