... Product Description: WNS series automatic fuel (gas) steam, hot water boiler is a horizontal three return fire tube boiler. The ... combustion chamber arranged so that the greater range of boiler water level safety, boiler steam space, steam quality guarantee good; Full ... / h, rated outlet pressure: 0.7 ~~ 1.6MPa. Hot water boiler: Rated heat power: 0.7 to 14MW, Rated water pressure: 0.7 ~~ 1.25MPa.