I'm in the planning stages of hopefully bringing heat to my garage. When I plumbed in my boiler I left a T in both the supply and the return for exactly this purpose. I went 1 1/2" on the Tee just so I could do anything I wanted.
Here's what I have:
House:
Wood boiler
T's in place in supply and return
Garage:
30 x 50 Pole barn
WELL insulated
Goodman propane furnace (hasn't had a propane tank in 3+ years).
My "idea" is to keep the shop ~50F to keep the chill out and then crank the heat up when I need to work in there. In the winter that is ~once/week.
The run: ~150' each way The garage is a bit higher in elevation than the house (<10') but the furnace is 9' in the air.
The "plan":
Water to Air heat exchanger in front of the current propane furnace.
My current thoughts:
1. Keep all controls in the garage to eliminate the need to run electric to the house. There is already a thermostat for the furnace, I can use that to trip a relay and run the circulator whenever there is a call for heat.
2. Use a Bumble Bee pump to allow return temp set point to get max efficiency.
Questions:
1. What should I do for the lines? Buy a pre-made setup? Spray foam? What size?
2. I know www.pexsupply.com is a great place for the pump and fittings, but they don't sell exchangers. Where should I get that?
3. How do I size the exchanger? By the rating on the propane furnace? By the physical dimensions of what will "fit"?
Any tips/tricks are greatly appreciated.
ac
Here's what I have:
House:
Wood boiler
T's in place in supply and return
Garage:
30 x 50 Pole barn
WELL insulated
Goodman propane furnace (hasn't had a propane tank in 3+ years).
My "idea" is to keep the shop ~50F to keep the chill out and then crank the heat up when I need to work in there. In the winter that is ~once/week.
The run: ~150' each way The garage is a bit higher in elevation than the house (<10') but the furnace is 9' in the air.
The "plan":
Water to Air heat exchanger in front of the current propane furnace.
My current thoughts:
1. Keep all controls in the garage to eliminate the need to run electric to the house. There is already a thermostat for the furnace, I can use that to trip a relay and run the circulator whenever there is a call for heat.
2. Use a Bumble Bee pump to allow return temp set point to get max efficiency.
Questions:
1. What should I do for the lines? Buy a pre-made setup? Spray foam? What size?
2. I know www.pexsupply.com is a great place for the pump and fittings, but they don't sell exchangers. Where should I get that?
3. How do I size the exchanger? By the rating on the propane furnace? By the physical dimensions of what will "fit"?
Any tips/tricks are greatly appreciated.
ac
). 
