... 3. Easy operation Product Description: WNS series automatic fuel (gas) steam, hot water boiler is a horizontal three return fire tube boiler. The ... boiler the applicable light oil, heavy oil, natural gas, liquefied petroleum gas, city gas, and other fuels. Using the wet back the waveform ... capacity: 20t / h, rated outlet pressure: 0.7 ~~ 1.6MPa. Hot water boiler: Rated heat power: 0.7 to 14MW, Rated ...