I think is the coldest morning so far).
The ThermGuard also helps keep pipes from freezing in mobile homes. The pipes are typically run in or next to the heating ventilation system. When a pellet stove or wood stove is running, the heater never comes on and the pipes have a high likelihood of freezing. If you program the ThermGuard to turn on the furnace fan, not the heat, just the fan, it will draw air heated by the stove and run it through the vents. In this water you can keep the domestic water pipes from freezing in a mobile home. Ten minutes every half an hour of running the fan would be a good place to start.
My hot water is just another zone on my boiler. I never had problems with the hot/cold domestic lines.....until this year when my dishwasher lines got slushy. It was always my heating lines that ran close to an outside wall or above the garage. We have had -25F (without wind chill) so far this winter. No problems with the boiler pipes!
Yes, typically you need one for each zone. I just built a unit for a member in Alaska that used a relay and controlled 4 zones with one ThermGuard. I used the relay design I have posted here. It was all in a nice plastic enclosure with a separate 24VAC transformer and a 4PDT relay and socket. The parts and labor don't make too much sense unless you are doing it yourself, or if you have more than 2 zones and want me or someone else to get involved.
Righty-o....that is a very typical application. ThermGuard units don't have to be installed by the thermostats. They can easily be installed in the boiler room. You only need to have access to the red and white wires that run up to the thermostat.
That is 100% correct. That is what I do on three zones of my house. The thermostats are turned off. The wood stove heats the area of the house I mostly reside in. The ThermGuards on the other zones periodically circulate water an the heating pipes never freeze. If you had potable water in any area that was completely turned off, might want to leave the thermostat set to 50, and leave the cabinets open, just in case. If the thermostat calls for heat because the temperature dropped below 50, the ThermGuards would reset their timing and not circulate water until the interval had expired (two hours for example) without heat being called for by the thermostat. In my house in Montana, I do have potable water, but the pipes aren't in danger (inside walls and over finished basement) so I leave the thermostats off and ThermGuards on.
I have well water with a cistern. For a while I had the deepest residential well in Montana (so I was told). 920 feet cased with steel all the way down. A fully loaded Lexus with leather interior buried in my yard.
