Replacing old line voltage thermostat

thermostat

My old 4 wire 240V mechanical line voltage thermostat stopped working. I want to replace it with a digital thermostat. Problem is I don't know the amp rating of the old thermostat. I checked with maker and they have no info…too old. Is there a way to check amp rating of old thermostat? A very good electrician installed the two 8 foot baseboard heaters, thermostat, 2-pole 20 amp circuit breaker and all wiring about 25 years but he is nolonger around.

Best Answer

20 amp circuit, so 20 amps (or more, but not less) for the thermostat.