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That's a worth while post... thank you for making the time to do it... =] Mike

Only thing I can think of is the difference in net input... 45k for "051" and 50k for "055". In some circumstances (very low calculated heat loss) a person might want the lower turn down. (But I am thinking about high mass radiant... as opposed to low mass types... where condensing boilers get...

Probably too late with this... The difference is in how water is heated. "051" has water in the tubes... "055" has water around the tubes (a "fire tube" boiler very similar to Triangle Tube condensing boilers). The high head pressure comes from the wall restriction of the small tubes in...