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Posted by HeatPro on May 23, 2005 at 10:52:10:
In Reply to: Re: Low Loss Header and One-Pipe Circuit posted by PS on May 23, 2005 at 09:30:40:
"My worry is what happens with the direct piping installation if the integrated pump isn't enough to move my system water, or it bottlenecks at the boiler?"
With a good boiler you have chosen, there is no significant resistance to water flow through the boiler, especially at a small flow of 60,000 btuh which would be handled at 6 gpm. Any residential circulator in general use now will handle that flow as long as the circuit lengths and tubing sizes are 'normal.' You can find out what the required flow through a one-pipe system of 3/4 and 1-inch one-pipe mains is here:
(the site has a complete course on selecting pipe sizes.) The charts were originally created by professor Warren Harris through experimentation in the 1940's.
As I said before, most plumbers would install a circulator for each of the circuit and the indirect without concern. Learning not to worry is done by learning how to properly design a simple system like the one you plan using tried-and-true design methods; they have been successfully heating houses for more than half a century with much less math skills than a typical high school grad by following the procedure in the charts taught by the boiler companies for all that time.
A successful installation will happen when the supply and return piping near the boiler differ by about 20F degrees on a thermometer; this will be the same whether the boiler is or is not condensing.
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