Quote:
Originally Posted by park381
If it had been installed 35 years ago, there would have been 2 circuits from the boiler.
Circuit 1 - Gravity primary hot water circuit including cold feed and expansion. This circuit would have been 1" or 28mm ( will draw it for you if wish)
Circuit 2 - This would be the heating circuit, complete with circulating pump, this circuit would have been 3/4" or 22mm.
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The gravity hot water would only have been used if the pipe runs were not too far from the boiler to the hot water cylinder.
Even worse my cylinder is a primatic one with the magic air bubble
