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Personal Finances / Building / Maintaining a Home


Subject:  Re: Radiant Heat System Date:  1/13/2004  2:17 PM
Author:  dcarper Number:  44571 of 137203

If the heat doesn't end up in the floor, where exactly does it go?

Mostly, it remains in the water, and simply doesn't get transferred to the air. So it uses less energy to reheat that water, but less useful energy is transferred to heat the room.

Well, it will eventually be transferred to the room. But the important part is that regardless of the transfer method, BTUs in = BTUs out. Eventually, the water will cool to the same temperature as the room, having transfered all the excess heat to the room.

A small amount of the energy is wasted heating the plastic itself and transition through the pipe walls, but it's a relatively insignificant amount.

Nope, not wasted. True, it will have to heat up (the first time), but as the system cools, this heat will transfer to the floor, although at that point the floor will be pretty cool, so you'll probably want the heat to come back on. But since the pipes are already hot, there is no heat used up to warm them.
The only heat wasted is what goes through the insulation to the downstair's ceiling.

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