1. Gas boilers generally have problems that condensate corrodes the boiler and shortens the furnace life.
2. The air consumption per unit area of heating is relatively high, and there is a big difference between high and low. For example, the low air consumption per unit area is 9m3/m2～10m3/m2, and the high one is 14m3/m2～15m3/m2.
3. The quality of heating has declined.
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