Oil and Pellet stove one thermostat

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New Member
Jan 23, 2016
Hey everyone! New to the forum first post.

Hoping someone can help me with this question. I have a Quadra fire pellet stove and an oil boiler for heating my home. When oil is cheap I run the boiler and when it's expensive I use pellets. I've been using one thermostat which is centrally located in the house and manually connecting the tstat wires to the unit I want to use for heat. This has been working pretty well however there are times I would like to easily switch the thermostat from one unit to the other without moving my thermostat wires. My question is, how would I connect a switch so I could easily toggle the tstat between the two units? My thermostat wires are two wire. My thinking is that I could use a SPDT switch but I may be way off on that. A wiring diagram would be most helpful!



Minister of Fire
Oct 16, 2008
North Alabama
I'd think a DPDT 6 terminal switch would work. Search ebay for those - there may be a wiring schematic. Or big box store will have them.
Eg: Tstat 2 wires go to center 2 leads. Oil heat 2 wires go to Left 2 leads, Pellet heat 2 wires go to Right 2 leads. The toggle is centered = nothing happens, Thrown L = oil, thrown R = pellet.
When you get a switch, check terminal continuity with a multimeter - and ask does juice flow the way I want it to?


Burning Hunk
Apr 20, 2015
I like the DPDT 6 terminal switch idea. I wouldn't have thought of that. I don't have the same setup as you, but I have a wood/fuel oil combination furnace with two seperate thermostats. I have just a regular household switch hooked up to my oil portion so I can keep the oil from kicking on while I add wood so I don't burn myself. You could always put a switch on each device, effectively turning one off when you want it, and the other one on. Just pick a wire to splice into with a switch. I don't believe it matters which one.
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