The electric baseboard heat in my living room has a mechanical thermostat (bimetallic strip) that occasionally gets stuck in the "on" position. I'd like to replace it with a solid-state thermostat, but the current thermostat is rated 22-amps, 240-volts, single-pole, and I haven't been able to find a solid-state replacement rated above 15 amps. Is there some way to boost the capacity of one of these thermostats so it can handle the full load?

  • Is your heater actually 22A? What circuit breaker is it on? – Ariel Jan 25 '15 at 0:51
  • @Ariel, It's connected to a 30-amp two-pole breaker. The thermostat is controlling a pair of heaters wired in parallel. I don't know the actual power draw, but 16.67 to 18.75 amps is typical for a similarly-sized pair. – Mark Jan 25 '15 at 1:58
  • That's actually an idea: Split the two heaters, and put separate thermostats on them. Might be cheaper than a relay. And if they are in different rooms you might get better temperature control. But even if not, just have two thermostats side by side. – Ariel Jan 25 '15 at 3:48

Use the solid state to drive a relay (that actually switches the baseboard) that is rated for the amps.

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  • Just make sure the relay you're using is fully UL listed for the application – ThreePhaseEel Apr 3 '15 at 16:36

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