I put in a Central Boiler unit 10 years ago - best thing I ever did. I have baseboard hot water and use my 25 year old combination furnace as my holding tank. One line in to furnace and one out for return. Furnace has hot water coil in it so that's what I still use - no heat exchanger needed. Never run out of hot water.
I have three Grundfos circulator pumps running off of that old furnace, one for each floor. The Central Boiler is a vented-open system but the gauge on my old furnace registers about 10 psi. I pressure filled the indoor system to begin with and then shut off the auto fill valve. My system hold 400 gallons and I haven't added but maybe 2 gallons over the last couple of years.
When I put this system in, I didn't have heat in my detached garage so I ran a line 150 ft. to it. I then installed a heat exchanger blower motor unit and can heat it up really fast with that. Normally I have the Taco 009 pump (for the garage) on a timer so that when its cold, water is circulating through the garage's copper pipe and that alone will always keep the temp above 45 degrees in there. I don't use antifreeze in the system as I have a generator backup, just in case.
My wood is "free" and that's a good thing as it will use wood - however, it's only as good as how well the unit and lines are insulated along with your house's insulation. The more times my indoor circulators run, the more demand for hot water and thus, wood.
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