pump thermostat

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ws9876
ws9876 Solar Expert Posts: 440 ✭✭✭
in Off Grid Solar & Battery Systems #1
Some people install radiators behind their wood stoves to pick up heat. And circulate it with a good pump like a Grundfos or similar to a tank.
If you wanted to turn on/off the circulator pump by thermostat ,what thermostat would you use ?? And how would you wire it to the Grundfos or other pump? It would probably be a drainback reservoir so the pump would go on until the temp got too high in the reservoir. and also would have a second control24 hr timer
so it would only pump during the day..what do you know??
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  • wellbuilt
    wellbuilt Solar Expert Posts: 763 ✭✭✭✭
    #2
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     As long as you put  a one way check valve in the cold line  bottom the het will cycle by itself .
      The tank just has to be higher then the stove 
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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #3
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    You don't even need a check valve, I have a 1" SS loop in my heater, and it themosiphons nicely with a 80 gal DHW tank above the heater. no loss in summer, and 90F water, preheated for my tankless.
      ( not my system, but very close )
    https://www.firespeaking.com/masonry-heaters/heat-water/details-of-plumbing/

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  • 706jim
    706jim Solar Expert Posts: 514 ✭✭✭✭
    #4
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    We heat a 450 gallon hot tub with a wood fired boiler. No check valve or circulating pump. The difference in height between  the 1.5" intake and outlet is about 2 feet.
    Island cottage solar system with 2500 watts of panels, 1kw facing southeast 1.3kw facing southwest 170watt ancient Arco's facing south. All panels in parallel for a 24 volt system. Trace DR1524 MSW inverter, Outback Flexmax 80 MPPT charge controller 8 Trojan L16's. Insignia 11.5 cubic foot electric fridge. My 30th year.
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  • Ralph Day
    Ralph Day Solar Expert Posts: 1,019 ✭✭✭✭
    #5
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    You can find a "snap switch" thermostat at a HVAC supply house.  They are a disc with 2 spade connectors.  Different cycling temperatures are available.  If you look in a furnace you'll see them on the outside of the plenum.  when the air gets hot enough they turn on the fan.  I used one to cycle a fan behind a woodstove until I started using Ecofans.
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  • Ralph Day
    Ralph Day Solar Expert Posts: 1,019 ✭✭✭✭
    #6
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    Meant to write that they are visible on the outside of the heat exchanger, not the cold air plenum.
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