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Posted by HeatPro on April 05, 2011 at 10:51:42:
In Reply to: Re: triangle tube boiler and pump posted by Bisseti on April 05, 2011 at 00:09:34:
"The 30 number then is the head loss for my heating circulator (longest (3/4" pex) circuit climbs 25 ft and requires 20k btus"
That is your error in looking for the head pressure requirement.
When the system is filled with water, the circulator doesn't have to push water up 25 feet, it is already full to the top on both sides. That concept remains the same for all filled parts of the system. The concept of 'water seeks its own level is part of that.
The head pressure requirement is solely for the resistance of the water rubbing and turning against the sides of the tubing and much less.
A circulator that is much more than required wears fittings, makes noise in the piping, and beats itself up.