... LDR0.3-0.4-D Electric Boiler professional boiler manufacture,convenient,simple, lowest prive, high quality LDR0.3-0.4-D Electric Boiler 1: ... This boiler take the electric power as an energy, through the ... scarcity, the overpressure, the flameout automatic protection functions. 4: The electric heating tube and the furnace body use the flange to ...