Natural gas heater with non-pressure design, more safety and high-efficiency. Thermal efficiency is up to 96.4% 440kwnatural gas hot-water heaterModel:SCA-38-WThermal power: 380000KcalJin Shunchang hot water boilers provide an outstanding thermal efficiency of 94.6%, and are suitable for commercial applications such as universities, hospitals, office buildings, villas, apartment buildings. ...