On May 18, 12:24*pm, keith wrote:
On May 18, 10:30*am, "Bob F" wrote:





Bob F wrote:
Cindy Hamilton wrote:
...and that water in the return line never gets hot? ...or it never
cools off? You're FOS

Well, look at it this way:

The water in the return line is probably close to room temperature.
He only
has to heat it from room temperature to his target temperature. *If
he was pulling in cold water from underground, his heater would have
a lot more work to do. *Yes, there are losses when he's done using
hot water, but probably not as great as the usage from heating up
all of that
40 F water.

Very good point. I hadn't even thought of that aspect. It probably
doubles the savings I get.

It is nice to see others here that can really think.

I guess we can always add that during the heating season, those losses heat the
house, cutting down furnace usage. Since I don't have A/C, no losses there.

You're losing the heat and heating the house.

I don't think Bob F ever said what his setup is like, but if his
plumbing runs
through the basement, the heating is negligible in practical terms.
Yes,
from a purely physics standpoint it's there, but it's like cooking a
pot of
soup with a candle.

Cindy Hamilton