Hi guys, I'm tired of trying to heat my house with a free standing stove and I've decided its time to add a wood boiler to my existing hydronic system. I'm starting this thread because there seems to be a lot of options and so much information available its a little overwhelming. I'll have questions along the way and would appreciated your feedback/knowledge/direction to resources as I try to put together a system and balance cost with reliability. The installed hydronic system has a Utica Boiler, 4 heating zones with finned baseboard heaters and 1 zone for an indirect hot water heater. I will get the rating for the boiler later but suffice to say its either 95K or 105K BTU size. The system is closed and operates at 10psi. I would like to incorporate thermal storage in the system. I found a forum member nearby me selling a 820 gal unpressurized thermal storage tank with a 100K BTU heat exchanger. My goal is to purchase the tank and install it in my basement. I would use the 100K HTX to provide heat to the house loop. I would like to keep the boiler a closed looped and use antifreeze so I will likely get a HTX for that side of the loop (probably 150K BTU HTX). Questions I have right now are, what size boiler should I be considering, is 150K BTU large enough? There is a used (indoor) ECOBURN 300K BTU boiler for sale nearby for $4500 that was manufactured in 2013, thoughts? Thanks in advance.