I'm pondering why you're so keen on the 'one box' solution for simplicity
of fitting for useless plumbers and self proclaimed 'heating engineers'
who can't cope with external tanks, pumps and flow share valves, but
recommend using a secondary circulation pump and the extra pipework and
skills this involes?
Of course I don't expect an answer. To save your fingers for better things
I'll include a line for you to just quote:-
*All generalizations are false.
Dave Plowman email@example.com London SW
I'm visualising one of the "commoner" range of combis (not one of dimms
exceptions to the norm) with a circulation pump from the hot water tap
system pumping back round to the cold water inlet thus maintaining a
continuous flow through its water flow detection circuit. We all know what
the combi will do under those circumstances - switch to hot water duty and
refuse to produce heat to the radiators. Another of dimms not thought
Fishface here hasn't a clue, not a clue!!!! You have a pipe stat on the
secondary circulation pipe, so when up to temperature the secondary
circulation pump is switched off and the combi reverts back to CH mode. All
secondary circulation loops must be lagged to retain the heat in the loop.
And this one goes around working on people's equipment!!! I despair!
At least dimm gave it a bit more thought this time. Seems a shame to now
have to add in a non return valve to stop water drawn off from the hot tap
taking a short route via the cold supply and the hot water loop return. Of
course he'll now claim he "meant" to say this all the time<g>
At this rate > Others might well just despair of your constant knee jerk
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