US2186803A

US2186803A - Heating apparatus

Info

Publication number: US2186803A
Application number: US216733A
Authority: US
Inventors: Goerg Bernard
Original assignee: American Radiator and Standard Sanitary Corp
Current assignee: American Radiator and Standard Sanitary Corp
Priority date: 1938-06-30
Filing date: 1938-06-30
Publication date: 1940-01-09
Anticipated expiration: 1957-01-09

Description

B. GOERG HEATING APPARATUS Jan. 9, 1940. v

Filed June 30, 1958 5 Sheets-,Sheet l BY

f

76,9 ATT RNEY 1938 5 Sheets-Shet 2 INVENTOR RNEY fHAM/e 60H26 B. GOERG HEATING APPARATUS Filed June 30,

Jan. 9, 1940.

| l x l l I l l l 1 l l i I r l B. GOERG HEATING APPARATUS Fil-ed June so, 1938 5v sheets-sheet s Jan. 9, 1940.

B. GOERG HEATING APPARATUS Jan. 9, 1940.

Filed 'June so, 1938 5 sheets-sheet 4 Jan. 9, 1940. B. GOERG 2,186,803

HEATING APPARATUS Filed June '50, 1938 5 Sheets-Sheet 5 l/fflh..

A "Il l//l/ 4 f/ l MATTRNEY Myinveii'tion relates to heating apparatus and ',Iheinvention consists in the novel construc- Patented Jan. 9, 1940 ES PATENT GFFICE HEATING APPARATUS Bernard Goerg, Scarsdale, N. Y., assignor, by mesne assignments, to American Radiator & Standard Sanitary Corporation, New York, N. Y., a corporation of Delaware Application June 30, 1938, Serial No. 216,733

12 Claims. (Cl. 122-156) Fig. 9 is a fragmentary plan section on the line 9-9 of Fig. 7.

Referring now in detail to the construction illustrated, the reference numeral IIJ indicates my improved boiler-burner unit in its entirety. The unit I comprises a boiler Il, a fluid-fuel burner apparatus I2, and an enclosing jacket I3. The jacket is preferably formed of sheet metal and includes a separate front section I4 hinged as indicated at I5 to the main body portion thereof so that the section I4 may be readily swung aside when it is desired to inspect, make adjustments or repair the parts of the burner and boiler.

The boiler II is here shown as being of the vertical round type and comprises a boiler part I6, a sheet metal cap I1 enclosing the upper part of the boiler part I6, and a supporting means for the boiler part including a plurality of spaced upright supporting

posts

20, 2l, 22 and 23. The posts rest at their lower ends on a foundation floor indicated at 24, and pass respectively at their upper ends through openings in spaced

lugs

25, 26, 21 and 28 which are formed integral with and extend outwardly from the lower outer sides of the boiler part I 8.

The

posts

22 and 23 and

lugs

21 and 28 are arranged at the rear of the boiler and the posts and 2I and

lugs

25 and 26 at the front of the boiler. The upper ends of the forward posts 20 and 2I are secured to their

respective lugs

25 and 26 by supporting nuts 30 engaging the threaded upper portion of the posts 20 and 2l beneath the lugs and 26 and by clamping nuts 3| engaging the threaded upper ends of the posts 2D and 2I above the

lugs

25 and 26. The upper ends of the

rear posts

22 and 23 are secured to their respective lugs by supporting nuts 32 threadedly engaging, respectively, the threaded upper ends of the

posts

22 and 23 and by collars 33 surrounding respectively the

posts

22 and 23 and engaging at their lower sides the nuts 32 and at their upper sides the

lugs

21 and 28. Clamping nuts 34 engage the upper end of the

posts

22 and 23 above the

lugs

21 and 28. The collars 33 are provided respectively, with inwardly and,forwardly extending projections 33a for a purpose which will appear more fully hereinafter. By changing the position of the supporting nuts and 32, and the clamping nuts 3i and 34, the height of the boiler may be varied to suit the requirements of the particular installation.

In the interest of simplicity and economy, the boiler part I6 is preferably formed as a one-piece @flmf- STAT more particularly to` boilers of the type suitable for yheating small buildings such as dwelling houses and the like.

L,AnobjectQof my invention is to provide a boiler of,y theiabove type, which is simple and relatively inexpensive` in Aconstruction and one which has a relatively large capacity for its size.

y A `further object is to provide a boiler-burner unit in which the boiler and burner are arranged and supported in assembled relation in an improved manner.

'-A still further object is to provide a complete boiler-burner unit compactly arranged within an enclosing jacket of neat and pleasing appearance vand so constructed that the working parts thereofare readily accessible for inspection and repair.-r

tion and combination of parts, to be more fully described hereinafter, and the novelty of Whch will be particularly pointed out and distinctly claimed.

k.In the accompanying drawings, to be taken as a part of this specilication, I have fully and clearly illustrated a preferred embodiment of my invention, in Which drawings- Fig. 1 is a vertical transverse sectional view taken through a boiler-burner unit constructed in accordance with one preferred embodiment of my invention, the section being taken on the line I-I of Fig. 2;

Fig. 2 is a vertical transverse sectional view taken on the line 2--2 of Fig. 1, and looking towards the rear of the boiler;

Fig. 3 is a horizontal plan section taken on the line 3-3 of Fig. l;

Fig. 4 is a horizontal plan section taken on the .line 4-4 of Fig. l;

Fig. 5 is an exploded detail view illustrating in perspective the boiler casting with the steel enclosing cap therefor;

Fig. 6 is an exploded detail view illustrating in perspective the improved manner of supporting and assembling the boiler and the firing chamber. parts being broken away for the sake of clarity;

Fig. '7 is a fragmentary vertical section showing the manner in which the boiler, ring chamber, and enclosing jacket are secured together at the rear of the boiler;

Fig 8 is a fragmentary vertical section showing the manner in which the boiler, firing chamher and enclosing jacket are secured together at the front of the boiler; and

casting and comprises an inner cylindrical shell defining a cylindrical combustion chamber 36 open at the bottom, and closed at the top by a crown sheet or top wall 31. The upper portion of the inner shell is offset inwardly or reduced as indicated at 33, and the top wall 31 is formed with a depressed portion 39 extending thereacross. The under side of the top wall 31 is provided with integral heat absorbing fins 40. The boiler casting I6 also comprises a cylindrical outer shell 4I spaced from the inner shell to provide a water space 42 surrounding the sides and top of the,inner shell. 'I'he shells are integrally joined at their lower ends and the

lugs

25, 26, 21 and 28 are formed integral with and extend outwardly from the lower end of the outer shell. The usual condensate return pipe 43 connects with the lower part of the water space 42 through the lower end of the outer shell and the steam supply pipe 44 connects with the steam space through the top wall 46 of the outer shell 4|. The normal water level is indicated by the dot-and-dash line 41.

As can be seen from an examination of Figs 2, 3, 4 and 5, the upper portion of the outer shell is oilset inwardly as indicated at 46 to provide at opposite sides of the casting I6 a pair of

arcuate recesses

49 and 59 separated at the front by an extension 5I of the outer shell extending upwardly from the cylindrical lower portion of the outer shell to points adjacent the top wall 46. The

recesses

49 and 50 are separated at the rear of the boiler by a shorter extension 52 of the outer shell extending from the lower cylindrical part of the outer shell and terminating at its upper end a substantial distance below the top wall 46 to provide a connection, indicated at 53, between the

recesses

49 and 50 at the rear of the boiler and above the extension 52.

' A pair of gas-

exit tubes

55 and 56 extend across the water space 42 and connect the upper end of the combustion chamber 36 to the ends of the

recesses

49 and 50 respectively which are adjacent the extension 52. The

tubes

55 and 56 are advantageously formed in part by the outer wall surfaces of the shorter extension 52 (see Fig. 4). The

tubes

55 and 56 are of substantially the same height as the shorter extension 52 and the inner ends of the tubes are located respectively at opposite sides of the depressed portion 39 in the top wall 31 of the inner shell 35. Thus, the

tubes

55 and 56 provide large exit passages for the ue gases and thereby permit relatively high ilring rates.

The lower front of the casting I6 is advantageously provided with a rectangular access opening 51 closed by a hinged door 56. The door 53 is provided with an inspection opening 58a closed withquartz glass and normally shielded to prevent sootlng by a pivoted ap 59.

The cap I1 is preferably formed cylindrical and of a suitable sheet metal such, for example, as regular steel. The cap completely encloses the upper end of the outer shell 4I and is provided with a gas outlet opening above the shorter extension 52 and communicating with the connection 53 between the

recesses

49 and 50. The lower cylindrical end of the cylindrical cap snugly engages a surface 6| which is slightly conical and is formed on the upper end of the cylindrical lower portion of the outer shell. The cap I1 serves to close the

recesses

49 and 50 and provide therewith a pair of

gas passages

62 and 63 connecting the outer ends of the gas-

exit tubes

55 and 56 with the gas outlet opening 60.

I provide a pair of horizontal partitions or

baille plates

64 and 65 which extend respectively from the opposite sides of the upper end of the shorter `extension 52 forwardly around the outer shell and toward the longer extension 5I so as to divide each of the

passages

62 and 63 into lower and

upper parts

66 and 61. The

plates

64 and 65 are shown as being of steel and as being secured to the inner sides of the cap I1. However, the plates may be formed in other ways, if desired. For example, they may be integral extensions of the casting I6. The forward ends of the

baille plates

64 and 65 terminate short of the longer extension 5I so as to provide connections between the upper and lower parts of the

passages

62 and 63, adjacent the extension 5I. From the above, it will be apparent that the flue gases leave the combustion chamber 36 through the gas-

exit tubes

55 and 56 and enter the lower parts 66 of each `of the

passages

62 and 63 adjacent the extension 52. The gases then flow forwardly toward the extension 5I, and then upwardly into the upper parts 61 of each of the

passages

62 and 63 and then rearwardly to the connection 53 and gas outlet 66. In flowing rearwardly toward the outlet 60, the ue gases also contact the outer surfaces oi' the top wall 46 (see Fig. 2). The arrows in Figs. 3 and 4 indicate the direction of now of the gases.

The arrangement of the gas-

exit tubes

55 and 56, the extensions 5I and 52 and

baille plates

64 and 65 provides an unusually long path oi' relatively large cross-sectional area for the combustion gases after leaving the combustion chamber, which path is continually bounded on at least one side by the outer heat absorbing surfaces of the boiler; thereby permitting relatively high tiring rates and providing for the absorption of an unusually large part of the heat in the gases and a substantially low gas-exit temperature. As the flue passages are provided in part by the steel cap I1, complexity in the casting I6 is avoided and the low cost of manufacture is preserved. The longer extension 5I advantageously provides an accessible outer surface for the usual service openings 69 which receive the necessary instruments such as the steam gage, water level glass, low-water cut-out, water temperature control, etc. The shorter extension 52 located at the rear and below the ue gas outlet 69 and in the water space 42 of the boiler, provides an advantageous construction for receiving a hot water heat exchanger 16. The exchanger 10 is here shown as being of the hair-pin type and as extending across the upper part of the extension 52 and within the depressed portion 39 below the water level. The exchanger 10 is provided with the usual connecting pipes 1I and 12 which may be connected to the usual hot water storage tank (not shown).

The outer surface of the steel cap is preferably surrounded by a suitable heat insulating material indicated at 13. An example of such insulation is rock wool. The insulation may be held in place by a relatively thin galvanized iron member 14. In order to protect the steel cap I1 at the relatively hot areas opposite the ends of the gas-

exit tubes

55 and 56, I provide a pair of

channels

15 and 16 respectively, which are suitably spotwelded to the outer surface of the cap I1 and provide vertical air spaces communicating at their lower ends with the air space within the jacket I3 and outside of the boiler. The channels prevent the rock wool from being packed tight against the cap at these hot points aisasos and assure a slight circulation of air along the outer surfaces of the cap. The slight circulation of air along the channels serves to dissipate the intense heat opposite the ends of the gasexit tubes fand thereby prevents damage to the steel cap. The air from the channels passes upwardly through the open upper ends thereof and is distributed in the minute spaces between the particles of rock wool. The lower part of the outer-shell is also surrounded by a suitable heat insulating material indicated at 11. An example of such an insulating material is corrugated asbestos lined with alfol which may be Wrapped about the lower cylindrical part of the outer shell and held in place by suitable metal bands 18.

The steel cap is also provided with a pair of rectangular openings 19 and 80 at each side of the extension 5| which communicate with the 20 forward ends of the upper and

lower parts

66 and 61 of each of the

passages

62 and 63. These openings are closed by detachable doors 8| and 82 which provide ready access to the flue passages for cleaning.

The boiler thus far described is admirably suited for oil-firing. In accordance with the present invention, the oil burner apparatus l2 oc cupies the space beneath the boiler and is suspended from the boiler and its supporting posts, v so that it may be readily assembled and detached for inspection and repair. The apparatus I2 is assembled as a unit and comprises an open-top cylindrical firing chamber Bil, a motor-driven blower 85 secured to and supported by the side of the ring chamber 69, a ow-control valve 86 also supported by the firing chamber, and an oil feed pipe 81 connecting the valve 86 with the interior of the ring chamber 89.

The ring chamber comprises spaced inner do and outer cylindrical shells 99 and 9| respectively, providing an air supply space therebetween and joined together at the top by an annular wall 92. The outer shell 9| is imperforate eX- cept for an air inlet opening 93 connected to the outlet of the blower 85 and an opening through which the feed tube 81 extends. The inner shell 90 is perforated as indicated at 99 so as to provide a properly distributed flow of combustionsupporting air into the firing chamber. An annular flange member 95 is suitably spotwelded to the upper outer edge of the shell 9|. A detachable clamping and supporting ring 96 loosely encircles the outer shell 9| and engages the under surface of the flange 95 for supporting the firing chamber beneath the boiler part |6.

At the rear of the boiler adjacent the

posts

22 and 23, the under surface of the supporting ring 96 is beveled as indicated at 91 (see Figs.

'7 and 9) and these beveled surfaces engage upper beveled surfaces 98 formed on the projections `33a of the collars 33 which are clamped respectively against the

lugs

21 and 28 by thenuts 32. The surfaces 98 on each of the projections 33a in conjunction with the under surfaces of the boiler part I6 provide spaced notches 99 at the rear of the boiler into which the rear of the clamping ring 96 and lflange 95 are readily inserted. As the

surfaces

91 and 98 are beveled, a tight t is assured between the upper surfaces 70 of the flange 95 and the undersurfaces of., the

boiler part I6 when the parts are in place. A suitable gasket |90 is interposed between the flange 95 and the under surfaces of the boiler part I6 to assure a gas-tight joint. At the front 75 of the boiler the ring 96, with the flange 95 and gasketv |00, is held tight against the under surfaces of the boiler I6 by bolts |0| extending downward through aligned openings in the forward supporting lugs 25 and 26 and by nuts |92 threaded to the lower ends of the bolts (see Fig. 8).

Thus, the entire burner assembly I2 may be quickly secured in position by placing the ring 96 in the notches 99 at the rear of the boiler and by placing and tightening the nuts |02 on the bolts IDI. This arrangement provides a unitary burner assembly which may be quickly attached to and supported in position by the same means as is used for supporting the boiler.

In order to assure that the collars 33 will stay in proper position to maintain the forwardly facing notches 99 for receiving the ring 96, the sides of the collars are provided with spaced projections |03 which will engage the sides of the casting I6 and prevent turning of the collars 33k on the posts 22 and 23 (see Fig. 9).

The supporting lugs 25, 26, 21 and 28 in addition to supporting the boiler and forming a part of the supporting and clamping means for the burner assembly, also serve as a means for securing and properly positioning the enclosing jacket I3 with respect to the boiler I6. The rear lugs 21 and 28 are provided with tapped openings which receive the ends of securing screws |06 passing through the jacket I3. Also the forward lugs 25 and 26 are provided with tapped openings which receive the ends of securing screws |61. Suitable collars |06 surrounding the screws |91 serve to properly space the jacket I3 from the

lugs

25 and 26.

From the above description, it will be readily appreciated that I have provided an improved boiler which is admirably suited for oil firing, and which is simple and inexpensive in construction, and one which is capable of operating at relatively high capacities for its size. The simple one-piece casting I6 with the steel cap I1 providing the relatively long iiue passages and large cross-sectional area make these advantages possible. Furthermore, the improved burner assembly I2 and the supporting means for the boiler and burner assembly, as well as the enclosing jacket of pleasing design with its hinged front section I4, all coact to provide a boiler-burner unit which is highly compact and which may be readily and easily assembled and installed and which may be readily inspected and parts repaired or replaced with a minimum of trouble and expense.

It is to be understood that the term boiler used herein is intended to include a hot water boiler as well as a steam or vapor generator, for the apparatus disclosed is well adapted for use both with a hot water heating system and with steam and vapor heating systems.

What I claim and desire to secure by Letters Patent of the United States is:--

1. A boiler including a one-piece casting comprising a double-walled body portion, the lower portion of which encloses a combustion chamber; the inner wall being closed by a transverse wall forming the crown of the combustion chamber and the outer Wall extending above said crown and being closed by a top wall enclosing a water space above said crown: upper portions of the opposite sides of the outer wall being offset inwardly relative to the lower portion of said outer wall to form recesses separated by lateral extensions of said outer wall above said lower portion thereof; gas-exit tubes leading from the dit combustion chamber to said recesses; and a wall member enclosing the Yupper portion ot saidV casting and enclosing said recesses -andhaving.

a ilue outlet.

2. In heating apparatus, the combination oi a cast-metal boiler part comprising an inner shell defining a combustion chamber open at the bottom and closed at the top, and an outer shell spaced from the sides and top oi the inner shell to denne with the latter a water space surrounding the sides and top of the inner shell and the shells being joined together at their lower ends; the upper portion of the outer shell being oilset inwardly from the lower portion at opposite sides o1' the boiler to provide a pair of recesses separated at their front and rear by extending portions of the outer shell; a pair oi' gas-exit tubes extending through said water space and connecting the upper portion of the combustion chamber with one end of each of said recesses; a sheet-metal wall member closing said recesses to form a pair oi gas passages and having a ilue outlet connected to said gas passages.

3. In heating apparatus, the combination of a cast-metal boiler part comprising an inner shell having cylindrical side wall surfaces defining a combustion chamber open at the bottom and closed at the top, and an outer shell having a lower cylindrical portion spaced from the lower portion of the inner shell and an upper portion spaced from the upper parts of the inner shell to define with the latter a water space surrounding the sides and top of the inner shell and the shells being joined together at their lower ends; the upper portion of the outer shell being offset inwardly from the lower portion at opposite sides of the boiler to provide a pair of arcuate recesses separated at their front and rear by extending portions of the outer shell; a pair of gas-exit tubes extending through said water space and connecting the upper portion of the combustion chamber with one end of each of said recesses; a sheet-metal wall member closing said recesses to form a pair of gas passages and having a ilue outlet connected to said gas passages.

4. In heating apparatus, the combination of a cast-metal boiler part comprising an inner shell dening a combustion chamber open at the bottom and closed at the top, and an outer shell spaced from the sides and top of the inner shell to deiine with the latter a water space surrounding the sides and top of the inner shell and the shells being joined together at their lower ends; the upper portion of the outer shell being offset inwardly from the lower portion at opposite sides of the boiler to provide a pair of recesses separated at their front and rear by first and second extending portions' of the outer shell. said first extending portion terminating at its upper end adjacent the top of the outer shell and said second extending portion terminating short of the top of the shell to provide a connection between the recesses above said second extending portion; a pair of gas-exit tubes extending through said water space and connecting the upper portion of the combustion chamber with each of said recesses; and a wall member closing the recesses to form gas passages and having a flue outlet communicating with the space above said second extending portion.

5. In heating apparatus, the combination of a cast-metal boiler part comprising anV inner shell deilning a combustion chamber open at the bottom and closed at the top, and an outer aisaeos shell spaced from .the sides and top o! the inner shell to deilne'with'the latter awater space surrounding the sidesand top o fV the inner sheiland the shells being Joined together at their lower ends; vthe upper portion of the outer shell being offset inwardly from the lower portion at opposite sides of the boiler to provide a pair of recesses separated at their iront and rear by first and second extending portions of the outer shell, said ilrst extending portion terminating at its upper end adjacent the top of the outer shell and said second extending portion terminating short of the top oi the outer shell to provide a connection between the recesses above said second extending portion; a pair of substantially horizontal partitions arranged respectively within the recesses and extending from the upper part of said second Aextending portion towards said ilrst extending portion and terminating short of the latter so as to divide each recess into upper and lower parts with a connection between the two adjacent said first extending portion; a pair of gas-exit tubes extending through said water space and connecting the upper portion of the combustion chamber with those ends of the lower parts of the recesses which are adjacent said second extending portion; and a sheet-metal wall member surrounding said upper shell and said recesses to iorm gas passages and having a flue gas outlet therein above said second extending portion.

6. In heating apparatus, the combination oi a cast-metal boiler part comprising an inner shell defining a combustion chamber open at the bottom and closed at the top, and an outer shell spaced from the sides and top of the inner shell to denne with the latter a water space surrounding the sides and top of the inner shell and the shells being joined together at their lower ends; the upper portion of the outer shell being offset inwardly from the lower portion at opposite sides of the boiler to provide a pair of recesses separated at their front and rear by ilrst and second extending portions of the outer shell, said ilrst extending portion terminating at its upper end adjacent the top of the shell and said second extending portion terminating short of the top of the shell to provide a connection between said recesses above said second extending portion; the outer wall of said second extending portion having an opening therein and a hot Water heat exchanger extending through said opening and into the water space above said inner shell; a pair of gas-exit tubes extending through said water space and connecting the upper portion of the combustion chamber with one end of each of said recesses; and a sheet-metal wall member closing said recesses to form a pair of gas passages and having a flue outlet above said second extending portion and connected to said gas passages.

7. In heating apparatus, the combination of a cast-metal boiler part comprising an inner shell defining a combustion chamber open at the bottom and closed at the top, and an outer shell spaced from the sides and top of the inner shell to dene With the latter a water space surrounding the sides and top of the inner shell and the shells being joined together at their lower ends; the upper portion of the outer shell being offset inwardly from the lower portion at opposite sides of the boiler to provide a pair of recesses separated at their iront and rear by rst and second extending portions of the outer shell; said ilrst extending portion terminating at its upper end adjacent the top of the shell and said second extending portion terminating short of the top of the shell to provide a connection between the recesses above said second extending portion; the top of the inner shell terminating adjacent the top of said second extending portion and the inner shell having a depressed portion therein extending thereacross from said second extending portion; a hot water heat exchanger arranged across the upper part of said second extending portion and within said depressed portion; a pair of gas-exit tubes extending through said water space and connecting the upper portion of the combustion chamber with one end of each of said recesses; and a wall member closing said recesses to form a pair of gas passages and having a flue outlet above said second extending portion and connected to said gas passages.

8. In heating apparatus, the combination of a cast-metal boiler part comprising an inner shell defining a combustion chamber open at the bottom and closed at the top, and an outer shell spaced from the sides and top of the inner shell to define with the latter a Water. space surrounding the sides and top of the inner shell and the shells being joined together at their lower ends; the upper portion of the outer shell being oiset inwardly from the lower portion at opposite sides of the boiler to provide a pair of recesses separated at their front and rear by rst and second extending portions of the outer shell, said first extending portion terminating at its upper end adjacent the top of the outer shell and said second extending portion terminating short of the top of the outer shell to provide a connection between the recesses above said second extending portion; a pair of substantially horizontal partitions arranged respectively within the recesses and extending from the'upper part of said second extending portion towards said rst extending portion and terminating short of the latter so as to divide each recess into upper and lower parts with a connection between the two adjacent said rst extending portion; a pair of gas-exit tubes extending respectively through said water space from the combustionchamber to the ends of said recesses which are adjacent said second extending portion, and being dened in part by opposite sides of said second extending portion, and each being of a height equal substantially to that of said second extending portion; and a sheetmetal wall member cap surrounding said upper shell and said recesses to form gas passages and having a ilue gas outlet therein above said second extension.

9. In heating apparatus, the combination of a cast-metal boiler part comprising an inner shell defining a combustion chamber open at the bottom and closed at the top, and an outer shell spaced from the sides and top of the inner shell to define with the latter a water space'surrounding the sides and top of the inner shell and the shells being joined together at their lower ends; the upper portion of the outer shell being offset inwardly from the lower portion at opposite sides of the boiler to provide a pair of recesses separated at their front and rear by extending portions cf the outer shell; the upper portion of the inner shell being oiset inwardly adjacent the offset of said outer shell so as to assure circulation of water in the space between shells; a pair of gas-exit tubes extending through said water space and connecting the upper portion ci the combustion chamber with one end of each of said recesses; a sheet-metal wall member closing said recesses to form a pair of gas passages and having a ue outlet connected to said gas passages.

10. In heating apparatus, the combination of a cast-metal boiler part including an inner shell open at the bottom and closed at the top, and an outer shell spaced from the sides and top of the inner shell to provide a water space about the sides and top of the inner shell, and the inner and outer shells being joined at the bottom; the inner shell having a depressed portion extending thereacross; a tubular hot water heat exchanger arranged in said depressed portion and including connections for hot water circulating pipes extending through said outer shell; a sheetmetal member enclosing the upper end of said outer shell and defining with portions of the outer surface thereof, a gas passage, and said cap having a ue gas outlet connected to said passage; and a gas-exit tube connecting the upper end of said combustion chamber with said flue gas passage.

11. In heating apparatus, the combination of a one-piece vertical boilercasting including an inner shell having cylindrical lower and upper portions defining a combustion chamber open at the bottom and closed at the top and the upper portion being of reduced diameter, and an outer shell enclosing the inner shell and defining therewith a water space about the sides and over the top of said inner shell, and the shells being joined together at their lower end; said outer shell having a cylindrical lower portion and an upper portion having its opposite sides oiset inwardly to dene arcuate recesses separated at their front by an extension of the outer shell extending to the top thereof and separated partially at their rear by a shorter extension terminating short of the top to provide a connection between the recesses above the shorter extension; a sheet-metal cap enclosing the outer shell and said recesses to form gas passages and having a flue gas outlet above said shorter extension; gas-exit tubes connecting the passages with said combustion chamber; a plurality of lugs extending outwardly from the lower part of said outer castings; upright supporting posts adapted to rest on a foundation floor and secured at their upper ends respectively to said lugs; an open-top iiring chamber secured at its upper end to said lugs; a metal enclosing jacket; and means for detachably securing said jacket to said lugs and for holding the jacket in spaced relation to said boiler casting.

12. In heating apparatus, an upright boiler part including a combustion chamber open at the bottom and a water space surrounding said combustion chamber; means for supporting said boiler part in spaced relation to a foundation oor and including a plurality of lugs extending from the lower part of the boiler and a'plurality of upright posts adapted to rest at their lower ends on the floor and secured respectively at their upper ends to the lugs; a firing chamber arranged beneath said boiler part; vand. means for detachably securing said ring chamber to said boiler part and including means providing notches on said supporting means at one side of said boiler part for slidably receiving the adjacent upper parts of said firing chamber and bolt means on the opposite side of said firing chamber from said notches and secured to said lugs and said iiring chamber for drawing said firing chamber upward against said boiler part.

iff GG.