Two-panel image: a cozy modern living room with a beige sofa, coffee table, and built-in shelves on the left, and a white Williams thermostat mounted on a beige wall on the right.

Living room interior with a beige sofa, wooden coffee table, plants, and a large arched window; wall-mounted white thermostat on the divider wall.

White Williams thermostat mounted on a wall in a bright kitchen with a wooden island and stools nearby.

Wall-mounted Williams thermostat on a white wall in a bright hallway, with a wooden console table and vase in the background.

White Williams thermostat mounted on a wall in a bright living room with wooden beams and a mirror nearby.

Millivolt Wall Thermostat

Name: Millivolt Wall Thermostat
Brand: Williams
SKU: P322016
Price: 64.99 USD
Availability: InStock

$64.99

Millivolt wall thermostat for 750 mV systems. Self-powered – no batteries or 24V wiring required. Temperature range 50-90°F.

Shipping: Free shipping from Colton, CA. Ships within 2 business days. Shipping policy

Returns: Returns accepted within 30 days from delivery if unused and in original packaging. 20% restocking fee applies. You pay return shipping unless the item arrives damaged or defective. Special-order items are final sale. Return policy

SKU: P322016 Category: Heater and Furnace Accessories Brand: Williams

System Compatibility	Millivolt systems (750 mV)
Valve Compatibility	Thermocouple and thermopile heating valves
Temperature Range	50°F to 90°F (10°C to 32°C)
Power Requirement	Self-powered (no batteries or 24V required)
Control Type	Manual analog (non-programmable)
Mounting	Surface wall-mount or unit-mount
Dimensions	3-3.5″ W x 3.25-3.5″ H x 1.125-1.5″ D

Self-powered – no batteries or 24V home wiring required
Manual analog slide/button control (non-programmable)
Temperature range: 50°F to 90°F (10°C to 32°C)
Surface wall-mounted or unit-mounted installation
Fits standard single-gang electrical boxes
Reliable mechanical operation

Monterey Top Vent Series
Forsaire Direct Vent Series
Direct Vent Furnaces
Vented Room Heaters
Floor Furnaces
Solana Electric Furnaces
All Williams millivolt-compatible furnaces
Any 750 mV heating system with thermocouple or thermopile valve

System Compatibility	Millivolt systems (750 mV)
Valve Compatibility	Thermocouple and thermopile heating valves
Temperature Range	50°F to 90°F (10°C to 32°C)
Power Requirement	Self-powered (no batteries or 24V required)
Control Type	Manual analog (non-programmable)
Mounting	Surface wall-mount or unit-mount
Dimensions	3-3.5″ W x 3.25-3.5″ H x 1.125-1.5″ D

Self-powered – no batteries or 24V home wiring required
Manual analog slide/button control (non-programmable)
Temperature range: 50°F to 90°F (10°C to 32°C)
Surface wall-mounted or unit-mounted installation
Fits standard single-gang electrical boxes
Reliable mechanical operation

Monterey Top Vent Series
Forsaire Direct Vent Series
Direct Vent Furnaces
Vented Room Heaters
Floor Furnaces
Solana Electric Furnaces
All Williams millivolt-compatible furnaces
Any 750 mV heating system with thermocouple or thermopile valve

This part is compatible with the following furnace units:

Williams Monterey Top Vent 25,000 BTU natural gas wall furnace

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