Propylene Glycol

Modern and vintage hand fired coal stove are similar to a wood stove and in some cases can burn either. They need to be regulated and fed by hand usually every 12 to 24 hours depending on your usage. They require no power to operate making them ideal for rural settings with long power outages.
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Robby
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Stove/Furnace Make: Harman & Elmira
Stove/Furnace Model: SF360, TLC2000, PC45

Post Sat. Sep. 13, 2008 2:58 pm

I was shopping in box store today, and noticed they are selling "Pet Friendly" automotive antifreeze. When you read the ingredients, it is propylene glycol with corrosion inhibitors, lubricants,etc. Would this not be perfect for boiler system. My system has steel boiler, copper lines, aluminium lines (Kitec) and brass and copper fittings. Other odds and ends in expansion tanks, pumps, valves etc. Seems that automotive cooling system is very similar. The price was $19.99 per gal. Much less than I have been quoted at plumbing wholesaler. Anyone with information, please let me know.

Robby

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coaledsweat
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Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea
Location: Guilford, Connecticut

Post Sat. Sep. 13, 2008 3:31 pm

Propylene based anti-freeze has a molecule that the body cannot absorb, that is what makes it safe as opposed to ethylene based fluids that will be absorbed and cause tremendous damage.

I'm not sure if it is boiler friendly though, if cheaper, I would look into it if that is what you need.
Nothing is impossible for people who don't have to do it themselves.

sarge
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Post Sat. Sep. 13, 2008 6:15 pm

all I did is left a tote at the local scrap yard and they called me when it was full most yards will give for free since they have to dispose of it but you can just put straight water into your system just don't shut it down in freezing weather most plumbers have a additive for straight water

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Robby
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Stove/Furnace Make: Harman & Elmira
Stove/Furnace Model: SF360, TLC2000, PC45

Post Sat. Sep. 13, 2008 10:34 pm

Yeah, I probably won't use any antifreeze in boiler part of system. I have read that it decreases efficiency by about 18%. I have no choice on the solar portion. It is out in freezing temperatures. Because it then goes into my domestic tank (dual stainless coils) it is highly recommended that non poison antifreeze only. I thought maybe this would work OK.

Robby

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Freddy
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Stoker Coal Boiler: Axeman Anderson 130 (pea)
Hot Air Coal Stoker Stove: Reading piece o' junk in the barn (rice)
Coal Size/Type: Pea size, Superior, deep mined
Location: Orrington, Maine

Post Sun. Sep. 14, 2008 5:56 am

Code says you can't, some people do.

Antifreeze doesn't reduce efficiency, it reduces heat flow. There's a big difference. It might use a teeny tiny bit more fuel, but basically it does not use more fuel if you have antifreeze in the system, but it does make it so the baseboard or radiators give off the heat more slowly. If you were building a new house and knew you were going to use antifreeze, you'd add 20% more baseboard. Conversely, if your heating system is designed very close and on cold days you can just barely keep warm, then you might not be able to keep up if you have antifreeze in the system.

Antifreeze is a maintenance issue. It must be checked and replaced every so often. Bottom line, if you do not NEED it, don't use it.
Orrington, Maine
Fred

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