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pliok
Registered Users
New Member
Posts:2
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| 01/25/2009 6:36 PM |
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Hello, I'm in the process of building a floor heating system (well...not personally), and I already saw on many websites that it is recommended, in order to avoid freezing, to mix 50% water with 50% propylene glycol. But I was wondering, if propylene glycol is so good, why not fill the pipes with only that and no water at all? Does anyone of you know if this would do any damage or have some other drawbacks?
Any help is greatly appreciated :)
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heatoftheearth
Registered Users
New Member
Posts:44
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| 01/25/2009 7:53 PM |
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| the more propylene glycol .the higher pumping cost. wear and tear even pump size |
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arkie6
Registered Users
Basic Member
Posts:153
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| 01/25/2009 11:16 PM |
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You want to run as little glycol as possible because it reduces the heat transfer properties of water. The higher the percentage of glycol in the system, the less efficient the system will be.
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BadgerBoilerMN
Registered Users
Basic Member
Posts:311
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| 01/26/2009 7:43 AM |
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Anti-freeze in residential hydronic systems is almost always a bad idea for the reasons stated above. It must be properly specified and maintained annually by a competent professional.
Stay away from the websites that recommend it and avoid taking advice from your peers. |
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MA
www.badgerboilerservice.com |
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jklingel
Registered Users
New Member
Posts:48
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| 02/05/2009 11:33 PM |
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| This is true for ethylene (?) glycol, the stuff for cars, and I suspect it applies to propylene, too. Your best protection (lowest freeze point) is w/ a 67% glycol/33% water mix. Not that your slab is going to get to -70 F or anything, but just for general knowledge I figured I'd throw in a car-related fact. Fair? |
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pliok
Registered Users
New Member
Posts:2
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| 02/05/2009 11:52 PM |
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| yep, thanks a lot everybody! |
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joe.ami
Registered Users
Veteran Member
Posts:1418
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| 02/07/2009 9:19 AM |
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FYI in closed loop geothermal we use <25% in systems designed to operate wilth fluid temps below freezing.
To great a concentration would be similar to pumping honey.
J |
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Just a Mechanic;
Geothermal; Savings Underfoot |
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