... and multi-functional diagnostic function c. Suitable for different types of gas,rated gas pressure(Pa),LPG-2800,NG-2000,COAL ... )exaust-0.017%e. Heat efficiency and energy-saving,90%of heat efficiency.f. 10 protection functions;g. Remote controller and ... heating and ventilation system including radiators, floor heating, fan coil wall hung gas boiler for room heating and shower hot water