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The Watts P-2331 is a thermostat / sensor.
This master control is designed for use with Watts 3 or 4 wire DualTemp series thermostat or any two wire thermostat with internal power. It is equipped with valve and thermostat terminals, incoming 24 VAC power connection and two 8 amp, dry contact terminals for pump and boiler operation. A maximum of three controls can be connected for expanded operation. An external 24/120VAC transformer, sold separately, is required to operate the control.
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