... optional Gas water heater technical specification descriptions:1> Product name: constant temp. gas water heater3> Gas type: LPG(Y), Natural gas (T).4> Gas rated pressure: LPG: 2800pa, Natural gas: 2000pa ... .5> Heat loaded: 12Kw, 14KW, 16KW, 18KW, 20KW.6> Gas exhausts type: natural gas exhaust.7 ...