A burner safety switch that opens when it senses the water from the burner is getting to hot and unsafe. Can be wired in series with the fuel solenoid or flame relay. 110 volt, 25 amp max rating. Can be used on 12VDC units. Available in 2 sizes 3/8"MPT or 1/2"MPT and 4 temperature maximums, 176°F, 203°F, 230°F and 320°F.
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