Model HWB-A12 wall boiler is an endurable and compact gas boiler supplying hot water for space heating and domestic hot water in one unit with efficiency above 90%. Installed indoor, it is rather safe thanks to its sealed combustion system not taking air in the room and exhaust gas is forced out of the house by a built-in blower.
Available in 4 output size18kW, 24kW，28kW，32kW, and comes with two versions, bithermal version and double heat exchangers version.
FACTS AND BENEFITS
TECHNICAL DATA
| Model |
HWB-A12-18P HWB-A12-18D |
HWB-A12-24P HWB-A12-24D |
HWB-A12-28P HWB-A12-28D |
HWB-A12-32P HWB-A12-32D |
| Fuel Type | Natural gas /LPG /Town gas | |||
| Rated gas pressure(Pa) | 2000(Natural gas) /2800(LPG) /1000(Town gas) | |||
| Rated heat load(kW) | 18 | 24 | 28 | 32 |
| Heat efficiencty at rated heat load | ≧90% | ≧90% | ≧90% | ≧90% |
| Power supply | AC220-50Hz | AC220-50Hz | AC220-50Hz | AC220-50Hz |
| Rated electric power (W) | 110 | 110 | 120 | 120 |
| Water proof protection | IPX4 | IPX4 | IPX4 | IPX4 |
| Central Heating | ||||
| Rated output capacity (kW) | 16.2 | 21.6 | 25.2 | 28.8 |
| Water temperature range (℃) | Radiator: 30-80; Underfloor heating: 30-60 | |||
| Heating area (sq.M） | 50-120 | 80-180 | 120-220 | 160-260 |
| Water pump lift（m) | 5 | 5 | 6 | 6 |
| Water pressure for heating system (MPa) | 0.1-0.3 | 0.1-0.3 | 0.1-0.3 | 0.1-0.3 |
| Expansion tank volume (L) | 6 | 6 | 6 | 6 |
| Expansion tank preload （MPa） | 0.1 | 0.1 | 0.1 | 0.1 |
| Heating system circuit | Sealed and forced | |||
| Domestic Hot Water | ||||
| Flow rate △T=25℃(kg/min) | 9 | 12 | 14 | 16 |
| Flow rate △T=30℃(kg/min) | 7.5 | 10 | 11.7 | 13.7 |
| DHW temperature range(℃) | 30-60 | |||
| Applicable water pressure(MPa) | 0.03-0.8 | 0.03-0.8 | 0.03-0.8 | 0.03-0.8 |
| Min.Startup flow rate(L/min) | 2.5 | 2.5 | 2.5 | 2.5 |
| Min.turnoff flow rate(L/min) | 2 | 2 | 2 | 2 |
| Connector | heating/gas inlet: G3/4; DHW connector: G1/2 | |||
| Flue spec (mm) | Coxial double pipes Φ60-Φ100 | |||
| Flue pipe length (m) | 1 | 1 | 1 | 1 |
| Net weight (kg) | 32.8 | 33 | 35 | 35 |
| Normal working noise (dB) | <45 | <45 | <45 | <45 |
| Exhaust type | Balanced forced draught | |||
| Ignition | Pulse automatic ignition | |||
| Temperature control method | Gas proportional modulating | |||
| Dimension (mm) | 740*410*310 | 740*410*310 | 740*410*310 | 740*410*310 |
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