Marley HUHAAMT1 Thermostat

The Marley HUHAAMT1 Thermostat is a field-installable, heavy-duty single pole thermostat specifically engineered for Marley MUH and Berko HUHAA series electric unit heaters. This mechanical, line voltage thermostat provides a reliable control interface with a temperature setpoint range of 40°F to 85°F, making it an essential component for maintaining frost protection or comfortable ambient temperatures in warehouses, garages, and industrial mechanical rooms. Designed for single stage operation, this kit includes a high-impact adjustment knob and is rated for a maximum load of 25 Amps at 120V, 240V, or 277V AC.

For contractors performing HVAC unit heater repair or thermostat replacement, the HUHAAMT1 ensures seamless integration within the heater cabinet. This high-capacity 25A thermostat utilizes a precision bi-metal sensing element or capillary tube (depending on specific heater sub-series) to deliver high-accuracy switching without the need for additional control relays in many standard single-phase applications. When installing on 3KW or 5KW units, verify your specific wiring diagram as this built-in heater thermostat is optimized for robust industrial temperature control across the entire HUHAA product line, excluding specific 3-phase 5KW configurations.

• Universal Compatibility: Specifically designed to fit MUH and HUHAA series unit heaters for a perfect mechanical match.
• High Current Rating: Handles up to 25 Amps resistive, eliminating the need for external contactors on most single-phase 208V, 240V, and 277V circuits.
• Wide Operating Range: Adjustable 40-85°F temperature range provides the flexibility needed for both unoccupied freeze protection and active workspace heating.
• Simplified Field Installation: Kit comes complete with a thermostat knob and mounting hardware for immediate technician deployment.
• Durable Construction: Built for industrial HVACR environments, providing reliable switching in demanding high-temp applications.

Is the HUHAAMT1 compatible with 3-phase heaters?
This single pole thermostat is primarily used for single-phase operation. 3-phase heaters typically require a 2-pole thermostat (like the HUHAAMT2) or must be wired to a 24V contactor system. Always check the heater’s internal wiring diagram for thermostat compatibility.

Can this be used as a low voltage 24V control?
The HUHAAMT1 is a line voltage thermostat intended for direct series wiring with the heating element or contactor coil at 120V to 277V. It is not a 24V low-voltage digital control.

Does this kit include the adjustment knob?
Yes, this Marley engineered thermostat includes the knurled adjustment knob and necessary hardware for a complete built-in installation.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.