Profile: Crown Boiler Co. distributes heating product accessories such as oil burners, operating controls and cast-iron radiation. Our product line includes residential gas, residential oil, indirect water heater, hydronic air handlers, air conditioners, warm air furnaces and warm air furnaces. Our Maxi-Therm2 indirect water heater is a porcelain enamel tank and heat exchanger with 3 sacrificial anodes for maximum corrosion protection.