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Plumbing / Adding a branch to heat a workshop

« on: January 15, 2018, 06:18:59 AM »

I have a CB E-Classic 3200 that is heating my house and my Dad's house with no issues.  It was installed professionally a few years ago and there are two Taco 007 circulator pumps out at the boiler pushing water to both houses through 1 1/4" underground, insulated PEX that then ties into both indoor boilers.  I am now going to extend an underground 1" insulated PEX line that will go out the other side of my Dad's basement and run about 80 feet to another building that I would like to supply some heat to.  My question(s) are related to how to plumb that line from where the 1 1/4" pex currently comes into my dad's basement and enters his furnace.  I plan to take a branch off the 1 1/4" PEX at some point after the thermostatic valve that is just inside my dad's basement wall (which returns the water back to the OWB if it drops below a certain temperature (150 maybe?).

1) Do I just split off the 1 1/4" with a tee to run the 1" out to the workshop?

2) Do I bring the 1 1/4" into a header (or manifold) in my dad's basement and then run it to both his furnace and the line that goes out and to the workshop?

3) Ultimately, I think i would feel better about running into a plate heat exchanger for my Dad's furnace instead of going straight into his furnace and having to de-pressurize his system every winter.  If I did that, should I first go to the HX for his furnace and then go to the workshop (running them in series), or should I still split the line having it go to both the HX for his furnace and the workshop (in parallel)?

4) Depending on which option is chosen, would I need another circulator pump to move the water through the workshop and back?

Thanks in advance for any advice.