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Posted by jtown on March 04, 2004 at 19:37:27:
In Reply to: Sizing residential steam boilers posted by Charles Slyer on March 04, 2004 at 07:19:00:
Severe oversizing can cause short cycling of burner and mismatch to air venting/steaming cycle. An oil boiler fired at the low end of it's range can be a little better sometimes. It will tend to have drier steam with a larger boiling surface and steam chest. Gas boilers can't normally be varied. If grossly undersized, you will send all the water upstairs and then any auto feeder will add enough water to flood the boiler when enough comes back down. Also, you risk the boiler cracking from going dry when too much goes upstairs. It isn't hard to do a radiation count.