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[userdk]

Glycol can become corrosive after a few years. Is there any treatment to run with it?

[slimjim]

Check it regularly, 2-3 years and add when neccesary!

[LittleJohn]

Yes water does transfer heat better and is easier to pumps; but it also tends to start freezing about 32f 

Where as your "typical" 50:50 mix of Propylene glycol you can still pump the fluid down to about 5f, and burst protection to about -20f THESE ARE ESTIMATED FLUID TEMPERATURE, NOT OUTDOOR TEMPS

[userdk]

Keep your pump going and don't worry about glycol.

[mlappin]

Yes water does transfer heat better and is easier to pumps; but it also tends to start freezing about 32f 

Where as your "typical" 50:50 mix of Propylene glycol you can still pump the fluid down to about 5f, and burst protection to about -20f THESE ARE ESTIMATED FLUID TEMPERATURE, NOT OUTDOOR TEMPS

Standing or still water freezes at 32, the water temp has to  be a lot lower than 32 before lets say a drainage ditch or creek freezes.

[slimjim]

I agree, out of all the units I have put in I don't think there are more than 6-8 that run any anti freeze, set it up to drain the boiler and blow out the lines right from the start and you will be fine.

[aarmga]

I know this post is old but incase anyone reads this wondering about what they do if they leave town.  I run my furnace in the house as I would if I didn't have a wood stove. Set my thermostat to 60 degrees and run my pump on low speed. My water temp in my wood stove stays 90-100 degrees even when it is 0 degrees Fahrenheit outside.  Keep the pump running and enjoy your time away.

[Goat Herder]

I think my temp drops more, a good safety check might be to turn the boiler fan off on a day that we are home and temps are at a level of concern and monitor water temps.  This would tell us how the boiler and other heat systems interact. 

We are having the warmest February that I can remember.

[aarmga]

Same here! Going to be in the 50s this weekend and 60s Monday! Going to get some wood cut.