I've been burning EPA high efficiency stoves and ZC fireplaces for almost a decade now. I've been a member just about as long. But boilers are a new world to me and I could use some guidance in how to best set my system up. So if you don't mind, take a look at what I have and tell me how YOU would set it up if it was yours. I currently have ground-source geothermal heating/cooling and I only plan to supplement home heating with the boiler. IE, if I feel like starting a fire I'll start a fire, if I don't, I won't. House is 5600 square feet but 1200 of that is not conditioned (storage space). It has 2 water-heaters, 1 in the garage, 1 in the utility closet in the house. What I have: My dad is giving me his Econoburn boiler. I believe it is an EB-200 but it may be a 150 (can't recall for certain). With that he has a 200 gal hot-water heater tank he has been using for storage. If I can fit it into my crawlspace I plan to utilize that as well. What I want to do: Heat the in-ground swimming pool to extend the swimming season (not a lot, just get it up to comfortable temp a month or so earlier in the spring and maybe keep it at temp a month or so later in the fall). Heat domestic hot-water any time the boiler is running. Supplement existing home heating Critical information: I do not currently have a good place to house the boiler, I plan to add on a small boiler-room to the garage. Directly behind this boiler room is the pool closet which sits on a crawlspace that I think is large enough to house the 200 gallon storage tank. The pool pump equipment is approximately 60 feet away from the boiler room and lines could be run underground (would have to be hand-dug) or could be above-ground and exposed to the elements. The main furnace and hot-water heater are approximately 65 feet from the proposed boiler room, all routing will be through crawlspaces. This run passes through 3 different crawlspaces, through 2 masonry walls. There is a 14 length between the 2 masonry walls (under the floor of the breezeway between the garage and house) that is not accessible. I'm hoping I can core-drill some 5" holes into the masonry walls, then slide a 4" PVC pipe in to make a "conduit" of sorts that will help guide the pipe under that breezeway floor. Specific questions: #1 Should I take hot boiler water to a heat exchanger near the pool-pump, or bring pool water to an exchanger in the boiler-room? #2 I plan to have everything zoned with valves so I can turn heating to the pool, domestic water, and home heating on/off independently. I know how to set up a manifold, but how/where do I incorporate that into my boiler/storage tank plumbing? #3 What kind of lines do I run to the furnace & hot-water heater? That's a long run to go uninsulated. Do you just buy pex and put that black foam insulation stuff on it? That may be challenging with the "conduit" I plan to push under the breezeway floor. Any thoughts/suggestions? More musings from me (you can skip this if you already feel like I've written a book): My envisioned burn style goes like this... as fall temps come and I want to extend swimming season a bit for the kids I'll fire up the boiler. This can heat the pool as needed, heat the domestic hot water, and if necessary for any cold snaps that happen along, at just a little heat to the house without kicking on the geo heating. As temps go down and it's not practical to heat the pool anymore I'll shut that valve off. The freed up BTU's the pool were using will now go to heating the house as needed (still heating domestic hot-water). Burn through winter as I feel like it and definitely burn through cold-snaps when the geo can't keep up. Then in spring, cut back on home heating and start bringing the pool up to temp. As summer approaches the valve for home heating will be shut off and eventually, when weather is warm enough that the pool stays warm the boiler will be shut down. From there we may fire it up occasionally if we get a lot of rain on the cover of the pool it cools it off so we may want the occasional warm-up throughout the summer.