Water Heater Heat Pump?

[JCsPlumbing]

Can anyone educate me a little on what I think is called water heater heat pumps? I think the coil dumps heat into the water heater. But I'm pretty ignorant in HVAC so all info-positives & negatives-are appreciated. Websites or books too. Thanks.

J.C.

[HVAC HAWK]

i will be putting in something like this for radiant heat in a couple weeks ,never did one before

[gear junkie]

http://www.apollohydroheat.com/

This is a very popular system up here. The biggest disadvantange is we need a 80 gal gas at a minimum since it's pulling double duty. We run pex from the W/H to the coil.

[JCsPlumbing]

Thanks Gear. I've worked on Apollo's before. BTU's important. The kind I'm trying to learn about work with the heat pump dumps the heat from the heat pump coil into the water heater. This increases the heat pump cooling efficiency while heating the water in the water heater. (I think!) But it is slow to heat the water so that has to be factored in.

Companies like Nyletherm, E-tech. Any experience with any of these systems?

J.C.

[gear junkie]

Guess I misunderstood. I'm not familar with this system. I am curious about this but can't understand how the heat pump will reject heat into a 140 deg tank.

[boillerman]

Are these the same kind of things the dairies use as preheaters before their regular WH tanks? I don't know that they use heat pumps per se, but they cool their compressors by running the water through them, then running it through 100 or 120 gallon tanks. It preheats to about 120 degrees, but is a very long recovery. They don't care, cause they usually dump about 3 times a day anyway.