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Posted by jeremiah on September 02, 2008 at 11:17:12:
In Reply to: Re: larger to smaller pipes posted by HeatPro on September 02, 2008 at 10:33:06:
It's a viessmann vitodens 100. Seems weird to have such a small inlet and outlet to me... 8 gpm is too much for 3/4, is it not? Would pumping 4 gpm be effective? The house is fairly small.
I love your knowledge and help, by the way.
: Which leads to the question of:
: which boiler is it that has a 3/4 inlet and outlet?
: the circuit length charts assume no resistance within the boiler. Some boilers, like copper-tube tankless heaters used for boilers have a high resistance in themselves requiring a high-head pump to pass water through the boiler and then work against the resistance of the circuit size and length with the remaining head.
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