电地板加热可以在托梁空间中的木地板下安装吗？
我需要加热一间浴室，估计热量为6,000 BTU/h。在此阶段，我还没有准备好更换瓷砖地板，但是我可以从爬行空间到木制地板下的托梁空间。由于尺寸很小，我想使用电加热源，但是看起来人们只在瓷砖下安装加热线，而从不在木制地板下，通常使用PEX管。
If anybody has tried using heated wire (or anything similar) under the subfloor, how was your experience?
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Hydronic heat is commonly installed under the subfloor. Electrical fixtures have to be installed in accordance with the manufacturer's instructions. One product I know that the manufacturer says can be installed from below is Step Warmfloor.
Installation video is here:https://www.youtube.com/watch?v=9SQ2KunoQBM
Most other systems are 18" wide and can't be trimmed for width, which would be a problem with 16" joists.
They recommend having more insulation below than above the heat element.
为什么不只是获得小型电墙加热器，踢脚板或天花板加热器和/或浅色组合。
I'm planning on installing this mat by suntouch for spot heating in bedrooms and near windows. I'm using it mainly so I can use it under nailed down hardwood on my main floor.https://www.homedepot.com/p/SunTouch-Floor-Warming-4-ft-x-16-in-Underfloor-Radiant-Floor-Heating-Mat-1200416U2R/100607080.
That's pretty pricey.
我对此感到满意：
https://www.amazon.com/gp/product/B07MZ5F5NQ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
我戴上了智能开关，每天打开大约4个小时，因为天气很冷。但是 - 在绝缘地下室后，它没有足够的帮助来证明它的时间合理。
Also - you won't get much value out of it unless you put at least R10 below it.
杰伊·托马斯（Jay Thomas），
Late getting back on this: the one I linked was specifically for putting under a subfloor and indeed is more expensive. It appears the only difference is they add an (assumed) aluminum sheet. That does pose the question on whether that’s required.
I doubt it. Heat is quite even when I use it... on it camera too. Just make sure to insulate below it.
>"I need to heat a bathroom with an estimated heat loss of 6,000 BTU/h."
What is that, an uninsulated outhouse located in Whitehorse Yukon?
Seriously, that's a huge heat load for a normal sized bathroom in an insulated house. How was that load estimated?
Dana, I haven’t punched any numbers out yet, but I am wondering if you accounted for the heat generated from the aerobic digestion :-)
Hi Dana, this is a rough guesstimate - bathroom space / house space x furnace BTUs/h x furnace efficiency. The bathroom is 14 x 14 x 10 feet, with 3 out of 4 walls being exterior walls, crawl space underneath and attic above. 2 windows 3 x 3 feet.
在平均冬季温度的一天中，热量损失可能为2-3k BTU/H（在此范围内不同的在线计算器的数字不同）。
Electric wire can produce this amount of heat, the question is can it be done from under plywood subfloor?
关于电的东西如果你供应the juice, it will supply the heat. This is in contrast to a hydronic system where it's possible for the water to return uncooled and no heat has been released.
First issue is whether that heat going where you want it -- up into the floor rather than down or sideways. Second issue is whether enough heat will escape, or will the wire or the area around it get dangerously hot. Third issue is whether at that heat load the floor will be comfortable and not too hot to stand on.
Insulation should solve the first issue, and it's something you can assess with your hands with the system running and add more insulation if you're not satisfied.
第三个问题应该可以解决。您正在要求地板提供30 BTU/SF。从加热地板中最大加热的普遍接受的数字为35 BTU/SF。因此，您接近范围的顶部，但在其中。
The second one I don't know how to address. I guess you could estimate the r-value of the floor and calculate what the temperature of the bottom of the floor would have to be to give 30 BTU/SF/hr at a floor temperature of 100F. Then see if the manufacturer's literature has a maximum safe operating temperature. I image it has some sort of thermostatic safety, but you don't want to be tripping it because you'll end up with a cold floor.