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Posted by HeatPro on March 05, 2007 at 14:21:35:
In Reply to: Re: Old weil-Mclain boiler posted by Andrew on March 05, 2007 at 13:48:05:
couldnt find anything about a subloop.
It isn't in words. It is IN THE INSTALLATION MANUAL DRAWINGS for boilers like the Phd. Two pipes close together, boiler inlet and outlet with pump, coming from the main with a pump.
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