... display temperature and combustion power, Timely error diagnoses, buzzer alarm, Microcomputer digital control 3.SP series: Bithermal heat exchanger, ... combustion power, Timely error diagnoses, buzzer alarm, Microcomputer digital control4.Gas type: Natural gas / LPG / Town Gas 5.Power selections available: 18kW, 24kW6 ... ensure normal operation in bad quality area Gas Wall Hung Combination Boilers