I am curious about the use of the WF synergy units radiant side to heat my regular HW- (I was quoted this system)- is this better than using a different unit (like Evision) and a desuperheater? I can't find anything talking about using a split system like this for potable HW.
Also quoted system lists Snnergy as a single stage unit and in the spec sheet that I downloaded it appears to be 2 stage.
Unit is Synergy 3d 049

Also gave estimates of 1289/yr for heat hw and a/c- which I think is way low- any thoughts?
We have a 2500sq' finished space- 1/2 new w/tight ins and 1/2 old- new low e glass windows wrap and siding.
The  calculations I was given are peak heating load 36800btu/hr- cooling 22000btu/hr- HP energy(??) 3679 kwh

Thanks in advance for help in understanding  all the  differences  in all the systems

Code calls for double wall vented heat exchanger to heat domestic hot water. This is to protect potable water from leaks of refrigerant / oil from the heat pump.

Radiant heat does not require double wall.

$1289 / year doesn't sound unreasonable given your fairly low design loads - it does depend on your electricity cost per kwh and where you are located.

I'm not a fan of adding operating hours on to the most expensive appliance in the house, to save a few bills on a water heater. A compressor replacement could cost more than the money saved over operating a conventional water heater. There have been several threads complaining of on demand domestic water heating from geo heat-pumps, Water furnace may think they have the bugs worked out better than their competitors, but I'm skeptical. Ask your contractor for customer references of folks satisfied with this system.
Also ask for operating cost calculation with heat-pump, de-superheater and conventional water heater. You may find it's not much higher tan the $1,289 mentioned.
Good luck,
Joe

I live in Salt Lake City Utah.

I heat and cool my 3500 sqft house for about $500 per year.   We have a 4 1/2 ton heat pump.

You can see my live data by following the link in my signature

your best use of this type of unit is for radiant heating, and rely on the desuperheate to assist in the domestic end of it, synergy can do domestic hot water heating, if you are realy after this then us the WFI EW 20

Joe

I share some of your skepticism about system cycles dedicated to domestic hot water calls only. No one seems to have managed it yet except maybe ECR DX. I believe the desuper option useful - since it skims off 10% or so of heat while compressor cycles per thermostat calls I see no net harm - it'll lengthen heat calls a minute or two and slightly shorten AC calls. Neither should induce significant additional wear and tear.

Still, ability to respond to hot water calls is a worthy goal. Domestic hotwater is the 2nd biggest house energy use after HVAC, so cheapening it is a good cause. Adding a cycle or two per day to an HVAC system shouldn't unduly burden it and the possible cost savings are significant. A colleague pointed out that the effects can be especially synergistic during cooling season as need for hot water pumps heat out of ground loop and that can provide for more cooling at greater efficiency.

Groundloop is right that EW series is correct for domestic hot water, but at significant added cost - EW is separate unit from Synergy