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[mlappin]

For a basement, two stories, and two air handlers I’d run a primary loop, then a secondary loop with a smaller pump to each air handler. Then set it up so you only have hot water to the air handlers on a call for heat.  For your domestic hot water if more than a few people in your household I’d go with a 20 FPH with a mono flo T to direct part of your flow to the FPH. In either case of a sidearm or FPH run your hottest water to that first then the air handlers.


Links to the things I mentioned.

http://www.supplyhouse.com/Honeywell-VU54S2024-Three-way-Fan-Coil-Valve-1-NPT-7-0-Cv

http://www.supplyhouse.com/Legend-Valve-Monoflo1x3-4-1-x-3-4-Copper-Monoflo-Tee-6314000-p

I like the 20 plate from Z supply as it already has two ports reduced to three quarters for connection to your water heater.

http://www.z-supply.com/brazed-plate-heat-exchangers.html

[Farmer Blue]

 The H4 will supply plenty of hot water. As far as how many pumps, I don't know capacities of each pump. The H4 will heat my house during below zero weather and the return temp. stays around 140. The hardest work the stove does is heating the swimming pool. The water will be cool going back to the stove.

[wonderwhy?]

Farmer Blue,  how much wood are you burning in a normal winter?  You actually heat a pool?

[Farmer Blue]

  My best guess is I use 2-3 cords a month. Since I am heating the DHW year round, heating the pool is no big deal. It is a 21' pool. I only heat it when someone wants to use it. Trying to keep it in the low eighties to keep Mrs. happy all the time takes to much wood. The heat enchanger is the size of a brick and it will make the stove work. I have made my own manifold using the pool pump to cycle the water through the heat exchanger. I can take the pool from 55 degrees to 80+ in 24-36 hours at the beginning of the season. During the summer you only have to go up from the mid 70's. That can easily be done overnight. I have a good solar cover and during 90 degree daytime temps the pool can get to warm.