Calco Controls is the number one name in American-made inline gas heaters. Simply connect an inline gas heater between your tank and regulator to warm compressed gas and eliminate gas flow freeze-ups. Calco heaters plug in and safely warm gas for continuous flow rates up to 1000 SCFH. The heaters are thermostatically controlled and can flow gas in either direction. They are truly indispensable for anyone relying on fluid gas flow rates for their business.