On Jan 5, 9:23*am, "
wrote:
On Jan 5, 8:36*am, TimR wrote:

You're all thinking deep inside the box.

You're fixated on "I have hot water, and I want hot air coming from my
airhandler, so I have to put hot water in my airhandler, how do I do
it?"

There's a better way.

You're making that hot air with a heat pump, which is extracting heat
from the surroundings.

Did he say that it's a heat pump system? *I didn't
see that.

*Put your hot water around your heat pump, and
it becomes much more efficient.

How exactly would he do that? *Sounds even less
practical.



Then you have another benefit. *Your ductwork and airhandler are
designed (if done correctly) for volume of air at a given
temperature. *So the controls will still work and you won't short
cycle.

I seriously doubt the excess heat from a system sized to
for a water heater is going to create short cycles. *I'd
first get a handle on how many additional BTUs it will
provide and I would not be surprised to find that it's just
not worth it.



Then in the summer, when you're dumping excess heat from your heat
pump to cool the house, you dump some of that heat into your hot water
system. *You get efficiency improvement year round.

And how do you get just the right amount of water
around the heat pump versus the air that it's made
to work with? * The approach of adding a heat exchanger
in the cold air return is at least straightforward.

This morning about 6AM I got a call from him.Thanks son Im working
evenings this week. He decided to apply the hot water to a second
system, He is going to put the radiator , in whatever form it takes,
in the fireplace. The fireplace is in the den located in the center of
the house and the HVAC unit has an air return there. He thinks he can
have a working if not pretty system installed in a day after getting
the radiator.

Jimmie