Sub-categories
Heat transfer oil boiler, hot oil boiler, thermal oil heater
Heat transfer oil( hot oil) boiler has YGL, YLL, YLW, YYQ, YYW, YSL, YSW types.
YGL, YLL YLW types are coal fired thermal oil heater, the combustion system is fixed grate and chain fire grate.
YYQ, YYW, YSL, YSW types are gas or oil fired thermal oil heater.
