... or flammable gas as fuel, steam boiler,hot water. Working principle: The boiler is industrial boiler, ... recycling, transmitting heat energy to heat equipment, and then most remaining heat return to be ... all rank of load. Saving electricity, fuel, water and electricity, you can recover the investment in 3 ... -6 month.steam boiler,hot water boiler Coal, Oil( Gas ) Fired Heaterthermal ...