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How far can the thermostat or wall switch be from the unit?

April 26, 2017Switch thermostat wall

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How far can the thermostat or wall switch be from the unit?

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A wall mounted thermostat or switch should be run no more than 40 feet when using 18 gauge, a relatively thin wire. Longer runs than 40 feet increase resistance, imparing the operation of the control valve. Longer runs need a thicker gauge of wire. 41-64 runs: 16 gauge. 65-100 runs: 14 gauge.