I'm thinking about replacing my existing gas-fired water tanks (30 gal & 40 gal) with aa single indirect tank on a priority zone off of my burnham series 2 boiler (164k btu input). I'm in the process of converting to central air / forced air heat, so heating the indirect tank would really be the only thing the boiler is doing, no other heating zones. (though I'm planning on putting a couple of smaller radiant floor zones in, mostly just to warm up tile in a bathroom.)
The question is, with this size boiler, and not worrying about any hydronic heating zones, how large a tank can I put in before I run into problems with the boiler not being able to heat the tank quickly / efficiently? I'd love to put in an 80 gal tank, but I'm concerned the boiler just doesn't put out enough btu's to heat it effectively.
Thanks in advance for any help!