In an earlier contribution to this discussion,
IMM wrote:


Having an auto by-pass dumping heat into a cylinder is a no, no,
unless. the cylinder has a boiler high temp cut off and a hot water
draw-off blending valve. Without these, water in the cylidner may
get to scalding level and the cylinder will may get to boiler flow
temperature (not a problem if a blending valve is used).

[So what happens if you have gravity primary circulation in the HW circuit
(with no zone valve and tank stat to convert them to C-Plan systems) - as a
great number of systems still do?]


Back to the main subject, if I can't dump the bypass into the cylinder,
what's wrong with dumping it into the HW return before it merges with the CH
return, as per
http://www.mills37.plus.com/cylinder2.JPG ?
--
Cheers,
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