Smith 100110279 Gas Thermostat is a critical field replacement component designed for precise temperature regulation in high-efficiency LP gas water heaters

ensure your burner orifices and regulators are correctly sized for your specific fuel type (Natural Gas or Propane) as this part is commonly used in Natural Gas configurations

this kit addresses common failure points such as worn diaphragms

Field Ready: Equipped with a 3/8" NPT side drain to assist in managing condensate and a rugged lever handle for manual lift testing

always mount the switch with the diaphragms in a vertical plane

Fenwal 35-63J101-015 Control R-407C Smith 100110279 Gas Thermostat isThe Fenwal 35 63J101 015 is a robust 24VAC Intermittent Pilot Ignition (IPI) control module engineered for precision gas valve sequencing. This unit serves as a high reliability direct spark ignition controller for gas fired heating equipment, featuring a 15 second ignition trial and a 30 second prepurge cycle to ensure safe combustion environments. Designed for micro processor based flame sensing, it utilizes flame rectification technology to monitor