it is the direct OEM replacement for 667261R

Durable Construction: High-grade ceramic and metallic components resist thermal fatigue in the burner compartment

Is this a direct replacement for my Sterling unit heater

and Armor Wall Mount (WA 125 thru 20) series

Trane TCONT724AS42DA Thermostat 321894-706 it is the direct OEMThe Trane TCONT724AS42DA, also known as the XL724 Thermostat, is a professional grade programmable commercial thermostat designed for precision climate control in complex HVACR environments. This 7 day programmable unit supports up to 4 stages of heat and 2 stages of cool, making it a versatile choice for standard gas electric, heat pump, and dual fuel systems. Engineered for high performance reliability, it features a 4. 3 inch touchscreen display