Abstract: A method, and a system for practicing the method, of heating liquid in a separator utilizing heat from a glycol regenerator. The system employs a gas pressure operated pump for pumping heat exchange fluid through a closed loop flow path. A gas burner in the regenerator vessel has a pilot light. Piping connects combustible gas to the burner and to the gas pressure operated pump and from the gas pressure operated pump to the pilot light. A thermostatically controlled valve is positioned in the heat exchange closed loop fluid flow path and opens and closes in response to the temperature of the liquid in the separator vessel, the valve opening to permit flow of heat exchange fluid in response to a detected low liquid temperature. Flow of gas through the pump remaining substantially constant at all times and providing a fuel source for the continuous operation of the pilot light.