In our radiant floor heating system, the water circulates for very
long periods at approximately 5 GPM; the water goes in at 115 degrees
F and comes out at 95.
We have never seen a heat pump solution for a system like this, but we
keep thinking that it is something that a heat pump might do better
than a propane-burning system.
Does anyone know of a heat-pump solution?
There are systemes available that utilize a heat pump to heat hydronic(s).
I personally feel the maintenance outways the savings in this respect. [But
others tell me no.]
Most are "built up" and not off the shelf.
On the air source side, I've not run into any mfgr specifically for radiant
floor water heating, but there are lots designed for pool heating...
try a search for that.
On the geothermal side almost every mfgr makes a water to water heat pump &
they're relatively bullet proof...
Just remember in either case you will need a buffer tank to insure long run
times, if not used the HP will short cycle & you WILL burn it up quick.
Pool units have the pools water volume & won't require a buffer tank...
I just got a call on one in Iowa,that's going on it's 3rd compressor in 2
This time they're installing the buffer tank, hopefully it'll last a bit
They're replacing contacts & anything else that shows signs of wear, but I
know they're in for future issues as well.
I'm suggesting a totally new unit, but the Utility is balking... (Utility
rebated/incentivised & designed initial system)
Do a search for radiant floor buffer tank & you should find a umber of
mfgr's & others (Terry Love, Dan Hoolihan etc...)
The rule of thumb is 1 Gallon /1000 Btu 80 gallon tank on a 80,000 btu unit
Most pool heaters dont provide for low O/S ambient operation ( there's no
defrost cycling )
IIRC Trevor Martin maybe has a lineup though--and would probly build up
whatever you kinda wanting since appears maybe your perhaps lacking a tad on
the engineering side of things.
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