gas boiler , olical wall mounted gas water heater specification1,input power.20KW2,output power:180483,thermal efficiency :92.5%4,voltage/hz/w:220/50/1205,heating water pressure:0.05-0.2Mpa6,heating area:140Sqm7,gas consumption 0.1cbm/kw/h8,hot water flow:10L/min9,water temperature 35-65 degree...