CN107906734A - A kind of return-stroke type wall-hung boiler - Google Patents
A kind of return-stroke type wall-hung boiler Download PDFInfo
- Publication number
- CN107906734A CN107906734A CN201710939713.8A CN201710939713A CN107906734A CN 107906734 A CN107906734 A CN 107906734A CN 201710939713 A CN201710939713 A CN 201710939713A CN 107906734 A CN107906734 A CN 107906734A
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- China
- Prior art keywords
- heat exchanger
- exchanger fin
- horizontal
- waterway
- return
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
- F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
- F24H1/124—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium using fluid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0005—Details for water heaters
- F24H9/001—Guiding means
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The present invention discloses a kind of return-stroke type wall-hung boiler.The present apparatus includes shell, heat exchanger, waterway tube, chimney, sets combuster and flue box, the flue box to be divided at least two backhaul chambers by partition plate in the heat exchanger；Two horizontal heat exchanger fins with holes are provided with the backhaul chamber and are clipped in longitudinal heat exchanger fin therein；Last described backhaul chamber is provided with air outlet；The chimney includes exhanst gas outlet and the air intlet being sheathed on outside exhanst gas outlet, and flue interlayer waterway is provided between the exhanst gas outlet and air intlet；The flue interlayer waterway is connected with longitudinal heat exchanger fin, horizontal heat exchanger fin and waterway tube with holes.The heat exchanger of the present apparatus forms backhaul heating path, reduce the area occupied of combustion chamber, add the area occupied of heat exchanger fin, reduce the use of combustion gas, by heating in reciprocating mode, so that high-temp waste gas is extracted out and utilized by wind turbine, the heat of high-temp waste gas is reduced, energy conservation and environmental protection, reduces the discharge of exhaust gas.
Description
Technical field
The present invention relates to gas heater technical field, specifically a kind of backhaul wall-hung boiler.
Background technology
Burnt gas wall hanging furnace is that fuel is exported through burner, after burning in the combustion chamber, by heat exchanger by heat absorption, wall hanging
Recirculated water in stove is when by way of heat exchanger, by heating in reciprocating mode, so as to constantly export heat, combustion chamber adds water
High-temp waste gas is produced after heat, exhaust gas is extracted out by wind turbine, via smoke stack emission to the external world, causes to remain substantial amounts of heat on chimney
Amount.General dual-purpose burnt gas wall hanging furnace is except with heating function, having hot water function concurrently, wall-hung boiler may be either that water heater provides heat
Source is alternatively ground heating system and provides heat source.
The high-temp waste gas that current burnt gas wall hanging furnace produces is discharged via exhaust fan from chimney, and exhaust gas has taken away substantial amounts of heat
Amount, these heats are distributed in atmosphere by exhaust fan and chimney, cause substantial amounts of waste.
Therefore urgently a kind of energy-saving and environment-friendly energy saving wall-hung boiler using heating by the exhaust gases.
The content of the invention
The present invention proposes a kind of backhaul wall-hung boiler, and the Btu utilization of exhaust gas is got up, and reduces the use of combustion gas, saves energy
Source, reduces the discharge of exhaust gas, environmental protection.
To achieve the above object, a kind of return-stroke type wall-hung boiler of the present invention, including shell, heat exchanger, waterway tube, cigarette
Chimney, the heat exchanger is interior to set combuster and flue box, the flue box to be divided at least two backhaul chambers by partition plate；Institute
State and two horizontal heat exchanger fins with holes are provided with backhaul chamber and are clipped in longitudinal heat exchanger fin therein；Last described time
Journey chamber is provided with air outlet；The chimney includes exhanst gas outlet and the air intlet being sheathed on outside exhanst gas outlet, the cigarette
Gas is exported is provided with flue interlayer waterway between air intlet；It is the flue interlayer waterway and longitudinal heat exchanger fin, with holes
Horizontal heat exchanger fin and waterway tube be connected；At least part of longitudinal heat exchanger fin is provided with the combustion chamber.
Wind turbine is provided between the air outlet and exhanst gas outlet.
The waterway tube is made of water knockout drum import, flue interlayer waterway, heat exchanger, water knockout drum outlet and pipeline；Institute
The current in waterway tube are stated successively by water knockout drum import, flue interlayer waterway, heat exchanger, water knockout drum outlet；The water route
Current in pipe be introduced into form backhaul chamber end longitudinal heat exchanger fin flow into again form backhaul chamber beginning longitudinal direction
Then heat exchanger fin is exported from water knockout drum and exported.
The chimney further includes the wind deflector for increasing endotherm area, and the wind deflector is arranged in exhanst gas outlet.
In the shape of a spiral, and rotary setting is on the inner wall of exhanst gas outlet for the wind deflector.
The outer wall of the heat exchanger is water-cooling wall, and the partition plate is water-cooling wall；The longitudinal direction heat exchanger fin and transverse direction with holes
There is gap between heat exchanger fin.
Smoke hole is provided with the horizontal heat exchanger fin with holes, the horizontal heat exchanger fin with holes set on the combustion chamber
For horizontal fire resisting heat exchanger fin, the transverse direction fire resisting heat exchanger fin is median rise both sides sink structures, is set on horizontal fire resisting heat exchanger fin
It is equipped with smoke hole.
The longitudinal direction heat exchanger fin, horizontal heat exchanger fin with holes and horizontal fire resisting heat exchanger fin are plate type heat exchange piece.
The longitudinal direction heat exchanger fin accounts for the 1/2-3/4 of heat exchanger volume；And longitudinal heat exchanger fin is located at the center inside heat exchanger
Position on the upper side.
The transverse direction fire resisting heat exchanger fin is slightly above the height of the horizontal heat exchanger fin with holes of lower floor.
The transverse direction fire resisting heat exchanger fin is arc, one kind in waveform or combination.
The longitudinal direction heat exchanger fin is clipped between horizontal heat exchanger fin with holes, and horizontal heat exchanger fin with holes and horizontal fire resisting exchange heat
Flue gas is averagely planned that converting heat efficiency increases by piece.
The longitudinal direction heat exchanger fin is clipped between horizontal heat exchanger fin with holes, or longitudinal heat exchanger fin is clipped in horizontal stroke with holes
To between heat exchanger fin and horizontal fire resisting heat exchanger fin；Backhaul chamber and heating plate that partition plate is formed are increased or decreased by area of heat-supply service
Quantity.
The heat exchanger is water-cooling wall, is communicated with water route, due to backhaul chamber end to backhaul chamber beginning flue gas
Non-uniform temperature, in order to preferably the water of heater be allowed efficiently to be brought rapidly up, the design is returned to water route in heat exchanger
Cheng Shuilu planning and designing；Longitudinal heat exchanger fin that the end for forming backhaul chamber is introduced into by backwater flows into form backhaul chamber again
Then longitudinal heat exchanger fin at beginning is exported from water knockout drum and exported.
The folding hermatic door for being capable of folding is provided with the heat exchanger, has in cleaning heater at any time and longitudinally exchanges heat
The flue dust of piece, horizontal heat exchanger fin with holes and horizontal fire resisting heat exchanger fin；The longitudinal direction heat exchanger fin, horizontal heat exchanger fin and horizontal stroke with holes
It is respectively arranged with to fire resisting heat exchanger fin and waterway tube and rinses upturned soil head, can be cleaned, discharge heat exchanger, partition plate, longitudinal heat exchanger fin, band
Incrustation scale in the horizontal heat exchanger fin in hole and horizontal fire resisting heat exchanger fin and waterway tube more circulates by water-cooling wall.
A kind of backhaul wall-hung boiler of the present invention, its advantage are：The heat exchanger of the present apparatus forms backhaul heating road
Footpath, reduces the area occupied of combustion chamber, adds the area occupied of heat exchanger fin, reduces the use of combustion gas, in wall-hung boiler
When recirculated water is by way of heat exchanger fin, extracts out and utilize by wind turbine by heating in reciprocating mode, so as to high-temp waste gas, reduce high-temp waste gas
Heat, energy conservation and environmental protection；Remaining heat is preheated on the water initial absorption chimney of the flue interlayer water cooling intracavitary, realizes water
The circulation of stream, the Btu utilization of exhaust gas is got up, and avoids the waste of heat, is saved the energy, is reduced the discharge of exhaust gas, is protected
Environment, high-temp waste gas utilize height.
Brief description of the drawings
Fig. 1 is the structure diagram of the embodiment of the present invention；
Fig. 2 is the structure diagram of heat exchanger of the embodiment of the present invention；
In figure：1- shells, 2- heat exchangers, 3- combustion chambers, 4- longitudinal directions heat exchanger fin, 5- partition plates, horizontal heat exchanger fin, the 6- in 6- holes
1- smoke holes, 6-2- transverse direction fire resistings heat exchanger fin, 7- flue box, 7-1 wind turbines, 8- air outlets, 9- exhanst gas outlets, 10- air intlets,
11- flue interlayers waterway, the import of 12- water knockout drums, the outlet of 13- water knockout drums, 14- gas valves, 15- ignitors, 16- combustion gas combustion
Burner.
Embodiment
Embodiment 1
As shown in Figure 1, 2, a kind of return-stroke type wall-hung boiler of the present invention, including shell 1, heat exchanger 2, waterway tube, chimney,
Combuster 3 and flue box 7, the flue box 7 is set to be divided at least two backhaul chambers by partition plate 5 in the heat exchanger 2；
Two horizontal heat exchanger fins 6 with holes are provided with the backhaul chamber and are clipped in longitudinal heat exchanger fin 4 therein；It is described last
One backhaul chamber is provided with air outlet 8；The chimney include exhanst gas outlet 9 and the air that is sheathed on outside exhanst gas outlet 9 into
Mouth 10, flue interlayer waterway 11 is provided between the exhanst gas outlet 9 and air intlet 10；The flue interlayer waterway 11
It is connected with longitudinal heat exchanger fin 4, horizontal heat exchanger fin 6 with holes and waterway tube；It is provided with the combustion chamber 3 at least part of
Longitudinal heat exchanger fin 4；Wind turbine 7-1 is provided between the air outlet 8 and exhanst gas outlet 9；The waterway tube by water knockout drum import 12,
Flue interlayer waterway 11, heat exchanger 2, water knockout drum outlet 13 and pipeline composition；Current in the waterway tube are successively through undue
Hydrophone import 12, flue interlayer waterway 11, heat exchanger 2, water knockout drum outlet 13；Current in the waterway tube are introduced into composition
Longitudinal heat exchanger fin 4 of the end of backhaul chamber flows into longitudinal heat exchanger fin 4 at the beginning for forming backhaul chamber then from water knockout drum again
The output of outlet 13；The chimney further includes the wind deflector for increasing endotherm area, and the wind deflector is arranged at exhanst gas outlet 9
It is interior；In the shape of a spiral, and rotary setting is on the inner wall of exhanst gas outlet 9 for the wind deflector；The outer wall of the heat exchanger 2 is water cooling
Wall, the partition plate 5 are water-cooling wall；There is gap between the longitudinal direction heat exchanger fin 4 and horizontal heat exchanger fin 6 with holes；It is described with holes
Horizontal heat exchanger fin 6 on be provided with smoke hole 6-1, the horizontal heat exchanger fin 6 with holes set on the combustion chamber 3 is horizontal fire resisting
Heat exchanger fin 6-2, the transverse direction fire resisting heat exchanger fin 6-2 are median rise both sides sinking arcuate structure, on horizontal fire resisting heat exchanger fin 6-2
It is provided with smoke hole 6-1；The longitudinal direction heat exchanger fin 4, horizontal heat exchanger fin 6 with holes and horizontal fire resisting heat exchanger fin 6-2 change to be board-like
Backing；The longitudinal direction heat exchanger fin 4 accounts for the 3/4 of 2 volume of heat exchanger；And the center that longitudinal heat exchanger fin 4 is located inside heat exchanger 2 is on the upper side
Position；The transverse direction fire resisting heat exchanger fin 6-2 is slightly above the height of the horizontal heat exchanger fin 6 with holes of lower floor；Longitudinal heat exchanger fin 4 is clipped in
Between horizontal heat exchanger fin 6 with holes and longitudinal heat exchanger fin 4 be clipped in horizontal heat exchanger fin 6 with holes and horizontal fire resisting heat exchanger fin 6-2 it
Between, the heat flue gas in longitudinal heat exchanger fin 4 is carried out average rule by horizontal heat exchanger fin 6 with holes and transverse direction fire resisting heat exchanger fin 6-2
Draw so that longitudinal 4 flue gas of heat exchanger fin is averaged dispersed-heated；Longitudinal heat exchanger fin 4 is clipped in horizontal heat exchanger fin 6 with holes and horizontal fire resisting
Heat exchanger fin 6-2 is increased or decreased the quantity of backhaul chamber and heating plate by area of heat-supply service；Water route communicates in heat exchanger 2, due to
The beginning flue-gas temperature of the end of backhaul chamber to backhaul chamber is uneven, in order to preferably allow the hot water of heater effective
Programming rate is lifted, and the design carries out backhaul water route planning and designing to water route in heat exchanger 2；It is introduced into by backwater and forms backhaul chamber
Longitudinal heat exchanger fin 4 of the end of room flows into longitudinal heat exchanger fin 4 at the beginning for forming backhaul chamber and then exports 13 from water knockout drum again
Output；The folding hermatic door for being capable of folding is provided with heat exchanger 2, has and clears up longitudinal heat exchanger fin 4, band in heater 2 at any time
The flue dust of the horizontal heat exchanger fin 6 in hole and horizontal fire resisting heat exchanger fin 6-2；The longitudinal direction heat exchanger fin 4,6 and of horizontal heat exchanger fin with holes
Horizontal fire resisting heat exchanger fin 6-2 and waterway tube, which are provided with, rinses upturned soil head, can clean, discharge heat exchanger 2, partition plate 5, longitudinal heat exchanger fin
4th, the incrustation scale in horizontal heat exchanger fin 6 with holes and transverse direction fire resisting heat exchanger fin 6-2 and waterway tube；Water-cooling wall can be allowed more to circulate.
When in use, when wall-hung boiler enters working status, wind turbine 7-1, which first starts, to be made to form negative pressure in combustion chamber 3
Difference, water knockout drum import 12 are opened, and instruction is issued instruction after ignitor 15 switchs its startup and issues gas valve 14, combustion gas by current
Valve 14 starts to start the appearance of 16 flame of gas burner, the water connection water knockout drum outlet 13 after heating, the flue interlayer water cooling
Remaining high-temp waste gas on water initial absorption chimney in chamber 1, then utilizes longitudinal heat exchanger fin 4,6 and of horizontal heat exchanger fin with holes
Horizontal fire resisting heat exchanger fin 6-2 is heated, and realizes the circulated heat conversion of current；Longitudinal heat exchanger fin 4 is located inside heat exchanger 2
Center position on the upper side, the density of hot gas are less than the density of cold air, and hot gas slowly sinks after being full of heat exchanger top, therefore passes through
Longitudinal heat exchanger fin 4 of heat exchanger 2 is arranged at the position of upper middle by accurate design, in favor of the circulation of hot gas；Combustion chamber 3
The inside is with the presence of negative pressure, so natural gas does not assemble the burning imagination, so as to deflagration phenomenon will not occur, realizes tranquil igniting
It is super-silent, it also ensure that peril.
Combustion chamber 3 produces high-temp waste gas after being heated to water, exhaust gas is by wind turbine 7-1, via smoke stack emission to the external world,
Cause to remain substantial amounts of heat on chimney；So that high-temp waste gas passes through through the helical form wind deflector in exhanst gas outlet 9, high-temp waste gas
Contacting the outer wall of flue interlayer waterway 11 reduces the temperature of high-temp waste gas, efficiently uses waste-gas heat；The outer wall of heat exchanger 2 is
The converting heat that water-cooling wall more efficiently make use of combustion chamber 3 to burn is the thermal energy of water, with wall-hung boiler phase of the prior art
Than the heat exchanger of return-stroke type wall-hung boiler provided by the invention forms backhaul heating path, reduces the area occupied of combustion chamber, increases
Add the area occupied of heat exchanger fin, reduce the use of combustion gas, as a result of the flue interlayer waterway being arranged at outside chimney,
The Btu utilization of exhaust gas is got up, avoids the waste of heat, saves the energy, reduces the discharge of exhaust gas, environmental protection, effectively
The heat using exhaust gas, energy conservation and environmental protection.
Claims (10)
1. a kind of return-stroke type wall-hung boiler, including shell (1), heat exchanger (2), waterway tube, chimney, it is characterised in that：The heat exchange
Combuster (3) and flue box (7), the flue box (7) is set to be divided at least two backhaul chambers by partition plate (5) in device (2)
Room；Two horizontal heat exchanger fins (6) with holes are provided with the backhaul chamber and are clipped in longitudinal heat exchanger fin (4) therein；Institute
State last backhaul chamber and be provided with air outlet (8)；The chimney includes exhanst gas outlet (9) and is sheathed on exhanst gas outlet
(9) outside air intlet (10), flue interlayer waterway is provided between the exhanst gas outlet (9) and air intlet (10)
(11)；The flue interlayer waterway (11) is connected with longitudinal heat exchanger fin (4), horizontal heat exchanger fin (6) with holes and waterway tube
It is logical；At least part of longitudinal heat exchanger fin (4) is provided with the combustion chamber (3).
A kind of 2. return-stroke type wall-hung boiler as claimed in claim 1, it is characterised in that：The waterway tube is by water knockout drum import
(12), flue interlayer waterway (11), heat exchanger (2), water knockout drum outlet (13) and pipeline composition；Current in the waterway tube
Successively by water knockout drum import (12), flue interlayer waterway (11), heat exchanger (2), water knockout drum outlet (13)；The waterway tube
In current be introduced into form backhaul chamber end longitudinal heat exchanger fin (4) flow into again form backhaul chamber beginning longitudinal direction
Heat exchanger fin (4) then from water knockout drum outlet (13) output.
A kind of 3. return-stroke type wall-hung boiler as claimed in claim 2, it is characterised in that：The chimney is further included for increasing heat absorption
The wind deflector of area, the wind deflector are arranged in exhanst gas outlet (9).
A kind of 4. return-stroke type wall-hung boiler as claimed in claim 3, it is characterised in that：The wind deflector in the shape of a spiral, and rotates
It is arranged on the inner wall of exhanst gas outlet (9).
A kind of 5. return-stroke type wall-hung boiler as claimed in claim 4, it is characterised in that：The outer wall of the heat exchanger (2) is water cooling
Wall, the partition plate (5) are water-cooling wall；There is gap between the longitudinal direction heat exchanger fin (4) and horizontal heat exchanger fin (6) with holes.
A kind of 6. return-stroke type wall-hung boiler as claimed in claim 1, it is characterised in that：On the horizontal heat exchanger fin (6) with holes
Smoke hole (6-1) is provided with, the horizontal heat exchanger fin (6) with holes set on the combustion chamber (3) is horizontal fire resisting heat exchanger fin (6-
2), the horizontal fire resisting heat exchanger fin (6-2) is median rise both sides sink structures, is provided with horizontal fire resisting heat exchanger fin (6-2)
Smoke hole (6-1).
A kind of 7. return-stroke type wall-hung boiler as claimed in claim 6, it is characterised in that：The longitudinal direction heat exchanger fin (4), horizontal stroke with holes
It is plate type heat exchange piece to heat exchanger fin (6) and horizontal fire resisting heat exchanger fin (6-2).
A kind of 8. return-stroke type wall-hung boiler as claimed in claim 7, it is characterised in that：The longitudinal direction heat exchanger fin (4) accounts for heat exchanger
(2) 1/2-3/4 of volume；And longitudinal heat exchanger fin (4) is located at the internal center position on the upper side of heat exchanger (2).
A kind of 9. return-stroke type wall-hung boiler as claimed in claim 7, it is characterised in that：The transverse direction fire resisting heat exchanger fin (6-2) is slightly
Higher than the height of the horizontal heat exchanger fin (6) with holes of lower floor.
A kind of 10. return-stroke type wall-hung boiler as claimed in claim 7, it is characterised in that：It is described transverse direction fire resisting heat exchanger fin (6-2) be
One kind or combination in arc, waveform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710939713.8A CN107906734A (en) | 2017-09-30 | 2017-09-30 | A kind of return-stroke type wall-hung boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710939713.8A CN107906734A (en) | 2017-09-30 | 2017-09-30 | A kind of return-stroke type wall-hung boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107906734A true CN107906734A (en) | 2018-04-13 |
Family
ID=61840386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710939713.8A Pending CN107906734A (en) | 2017-09-30 | 2017-09-30 | A kind of return-stroke type wall-hung boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107906734A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1317566A (en) * | 1969-09-27 | 1973-05-23 | United Gas Industries Ltd | Space heating appliance |
| CN1959282A (en) * | 2005-10-31 | 2007-05-09 | 上海市向明中学 | High performance gas water heater |
| CN204254886U (en) * | 2014-10-23 | 2015-04-08 | 梁垣生 | Condensing secondary heat exchange wall-hung boiler |
| CN205579720U (en) * | 2016-03-08 | 2016-09-14 | 浙江凯姆热能设备有限公司 | Energy saving and emission reduction's gas hanging stove |
| CN106524512A (en) * | 2016-12-15 | 2017-03-22 | 杨文程 | Condensation type internal combustion multi-return-stroke boiler |
| CN207455887U (en) * | 2017-09-30 | 2018-06-05 | 杨文程 | A kind of return-stroke type wall-hung boiler |
-
2017
- 2017-09-30 CN CN201710939713.8A patent/CN107906734A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1317566A (en) * | 1969-09-27 | 1973-05-23 | United Gas Industries Ltd | Space heating appliance |
| CN1959282A (en) * | 2005-10-31 | 2007-05-09 | 上海市向明中学 | High performance gas water heater |
| CN204254886U (en) * | 2014-10-23 | 2015-04-08 | 梁垣生 | Condensing secondary heat exchange wall-hung boiler |
| CN205579720U (en) * | 2016-03-08 | 2016-09-14 | 浙江凯姆热能设备有限公司 | Energy saving and emission reduction's gas hanging stove |
| CN106524512A (en) * | 2016-12-15 | 2017-03-22 | 杨文程 | Condensation type internal combustion multi-return-stroke boiler |
| CN207455887U (en) * | 2017-09-30 | 2018-06-05 | 杨文程 | A kind of return-stroke type wall-hung boiler |
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