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Old 06-16-2008, 11:55 AM   #1
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Electric radiant


There is a small bathroom in the basement that I am renovating. The current heat system is hot water baseboard. I am considering installing electric radiant in the bathroom since it's a pretty small space (6' x 10'). Will the electric radiant do the job well enough or should I put in a short piece of slant fin (2' - 3')?

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Old 06-16-2008, 12:40 PM   #2
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Electric radiant


Yes, you can install a low voltage system. Is the 6 x 10 dimension the open sq footage or the entire bathroom? Is the floor a slab on grade or slab below grade?

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Old 06-16-2008, 12:44 PM   #3
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Electric radiant


It's a slab below grade, 6 x 10 is the whole room.
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Old 06-16-2008, 12:46 PM   #4
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Electric radiant


Any exterior walls? Any insulation in the inner walls planned?
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Old 06-16-2008, 01:02 PM   #5
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Electric radiant


There is one exterior wall (block) that's about 70% below grade. One very small window (18" x 24"). The walls will be studs / drywall and the one exterior wall will be insulated with R13 fiberglass. Not planning to insulate the interior walls.
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Old 06-16-2008, 01:11 PM   #6
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Electric radiant


If you don't plan to have heat through out the rest of the basement, with the window in the room and the basement area without (much) heat with no insulation in the interior walls, it's a maybe, at best.

Though radiant is the nicest heat you can use, it seeks cold. If you have a lot of heat loss, using radiant as primary without a heat loss calc, can be iffy.

I did it in my basement but since the rest of the basement maintains 65 degrees, it works great. I also installed the next size up system, spaced the wires closer together, so that I could generate more watts psf. It sounds like you have around 40sf of open floor, so I would use the 50-64sf Floorizwarm low voltage system. Install it per the manufacturers direx.
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Old 06-16-2008, 01:26 PM   #7
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Electric radiant


The rest of the basement is heated and insulated. My concern is that most of the heat will go into the ground not into the room.
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Old 06-16-2008, 01:53 PM   #8
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Electric radiant


Yes, you will probably loose 15-20% downward unless you want to build up another 1-1/2" with a vapor barrier/insulator/backer board design. A small baseboard worked before and is the cheapest way to go but if you want radiant, it's a give and take in this case.

Also, low voltage Floorizwarm system costs about 15% more than custom line voltage mats so you'll pay more for it but get a much longer warranty and versatility to play with the wattage. And, if you have an issue later, they are easier to repair then line voltage.
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Old 06-16-2008, 02:06 PM   #9
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Electric radiant


I just looked at the Floorizwarm manual on the website. I get the impression that "floor warming" is their bread and butter. In fact, my gut is telling me that asking electric radiant to provide real "heat" on an uninsulated basement slab is a bit too much. I appreciate the help, I suspect I'd be disappointed with this type setup.
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Old 06-16-2008, 03:17 PM   #10
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Yes, it is designed for floor warming..thus the name. As I mentioned, in your case, it may be an issue. And again, a Heat Loss Calculation is critical when installing radiant as primary.

We have installed it many times as primary, after knowing the heat loss by installing a higher wattage system in a smaller area, with excellent results.

In your application, without knowing the heat loss...we are in agreement.

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