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Old 10-23-2014, 01:59 PM   #1
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Supplemental Radiant Floor Heating Best Option


We live in Richmond VA and currently have a heat pump which forced air which kicks over to the auxiliary heating strips below about 40F (much of Dec through Mar).

I've been interested in adding supplementation radiant floor heating installed between the floor joists in our closed crawl space to provide additional heating to about 300-400 sq.ft. on the first floor.

I'm thinking it would be a single zone heating system kept at around 68-70F through the winter. A low cost option is key and I've been trying to get my head around all the alternatives (the electric rolls between floor joists seem more expensive than a hydronic system) and am wondering about a simple hydonic system with a tankless electric water heater designed for radiant heating (like the ones sold by EcoSmart) but can't find much information on what a simplistic one zone closed loop system would require. I also have a preference for electric as I currently do not have a gas service and installing gas would mean an annual $300 gas service fee.

Any information on system models for the above or other suggestions on a low cost radiant heating installed between floor joints would be greatly appreciated. Thank you!

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Old 10-23-2014, 05:03 PM   #2
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Supplemental Radiant Floor Heating Best Option


Before I get into the radiant heat.

Are you saying your heat pump is shutting down at 40f outside temp, and your only heating with the electric strip heaters from then on? Thats real expensive. And a waste of electric.

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Old 10-23-2014, 05:28 PM   #3
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Supplemental Radiant Floor Heating Best Option


The heat pump doesn't shut down but it can't keep up below 40F and the electric strips turn on, so they are pretty much our main heating for 3 months, and yes, it's VERY expensive.
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Old 10-23-2014, 05:52 PM   #4
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Supplemental Radiant Floor Heating Best Option


Might have trouble finding a small enough electric boiler.
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Old 10-23-2014, 07:19 PM   #5
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Supplemental Radiant Floor Heating Best Option


Quote:
Originally Posted by kevin2martin View Post
The heat pump doesn't shut down but it can't keep up below 40F and the electric strips turn on, so they are pretty much our main heating for 3 months, and yes, it's VERY expensive.
I would focus on the problem with on your heat pump or house insulation first. Even if it's an older unit it should do well down to 20 degrees or so without needing electric backup.
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Old 10-23-2014, 08:24 PM   #6
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Supplemental Radiant Floor Heating Best Option


nevermind


Last edited by zappa; 10-23-2014 at 08:31 PM.
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