Use this 2-Stage LB White Thermostat with Therma Grow + (Plus) Greenhouse Heaters. A 2-stage thermostat is required for better fuel efficiencies if the heater is not connected to a house controller. This thermostat incorporates two independent control circuits which interconnect to the heater's two-stage gas control valve, providing low or high heat depending on thermostat set point.

• 2-stage
• NEMA 4X case

Works With the Following Therma Grow Heaters

• QC Part #21352 - 120+ Propane
• QC Part #21353 - 120+ Natural Gas
• QC Part #21356 - 220+ Propane
• QC Part #21357 - 220+ Natural Gas