White-Rodgers M150 mechanical thermostat fits single-stage heating, cooling and heat pump systems without aux heat. We name the system, the voltage, and the wire: it also works with 3-wire zone valves and 750mV millivolt applications.
Set it once with the dial. Rugged snap-action contacts, adjustable heat anticipator and bimetal thermometer keep operation steady.
M150 Thermostat Highlights
Single-Stage Heat/Cool
Controls single-stage gas, oil or electric heat and cooling, plus heat pumps without aux heat.
Zone and Millivolt Ready
Works with 3-wire zone valves and 750mV millivolt systems.
Mercury-Free Mechanical Design
Uses snap-action contacts and bimetal thermometer for reliable dial operation.
M150 Thermostat Specifications
Use: Home and apartment
Display: Bimetal thermometer
Contacts: Rugged snap-action, mercury-free
Operation: Mechanical with adjustable heat anticipator
Not compatible with: Multi-stage systems, heat pump with Aux, electric baseboard 120/240 V
System compatibility: Single-stage heating, cooling, heat pump without aux; 3-wire zone valve; millivolt (750mV)
