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Friends, I need to figure out the following: I have a furnace that will heat from an electrical or solar ( hot water ) source. the solar source pump runs on 120vac and the electric runs on 240vac. I need a way to have the system switched between the electic and solar sources determined by the temperature of the water in the storage tanks. I would use a 10K sensor in the storage tank. And the system has to be controlled by the 24vac thermostat. I am confused. any help would be greatly appreciated. Reed B. Turney

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What you need is called an aquastat. good luck

Posted on Jan 19, 2009

  • Reed Turney Jan 03, 2014

    joe, boy that was a while back!! i did end up using two aquastats, one making on temp rise, one on temp drop..worked well except that each aquastat had a 5% differential, so there was a 'gap' between them when neither would function...changed over to an electric tankless water heater in the furnace circulation loop that turns on via one aquastat feeding two valves that will isolate the heater when temps are high and when they are low, it closes the bypass and opens the heater thanks for the help...apprediated..


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2) Wire is too small.
Problem is NOT circuit breaker.

3) Both 240Volt appliances on same breaker is a hazard, especially if space available in 200 amp service panel for more breakers.

4) Usually each 240V appliance has separate breaker.

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Electric code requires wire-size match breaker-size.

6) If you put larger amp breaker on same wire that is getting hot, then wire will get hotter.
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7) Each appliance has volts and watt rating on label.
EVERY appliance has label.

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Stove would require 40 amp breaker and 8 gauge wire.

9) How to figure it out:

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