designing a central heating and hotwater system

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Ducking nothing. Nahhhhh. You are not getting there.

If a whole system is being fitted the whole house will be disrupted.
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More old wives tales! Some combis have pre-hearted heat exchangers and some with small pre-heated hot water vessels to give pronto hot water at taps.

Are you on about cylinders?
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IMM wrote:

And most combis are further from the bathroom than a cylinder would be. hence the wait for hot water.
MBQ
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Then put the combi in a more suitable place, like the loft.
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Yet another shortsighted piece of garbage from dIMM. Next he will be putting the kitchen sink and anything else that uses hot water up in the loft with it.
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Roger

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contains these words:

<snip drivel>
Misinformation not worth reading.
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Brilliant. It will then be as far away from the kitchen as possible. And the kitchen is likely to need hot water the most often.
Do you ever think before replying?
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Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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wrote:

Ah, but IMM probably lives in a bungalow which he cunningly designed to have the bathroom next to the Kitchen, another one of those IMM 'one solution fits all' answers...
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wrote:

Unknowingly you have hit it. Houses designed for passive solar have all the utility and storage rooms on the north side of the house.
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wrote:

Educated guess...
Houses designed for passive solar have all the

Exactly, and it's also exactly why your suggestion is next to useless in 98 percent of British homes.
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wrote:

Put the combi in the loft and have a secondary circulation pump to ensure instant water at all taps.
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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:-
(snip drivel)
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wrote:

<snip drivel>
incomprehensible babble.
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IMM wrote:

Could use all teh waste heat to keep ice off the A5.
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wrote:

Positive thinking.
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wrote:

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 through ideas!
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wrote:

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!
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If you despair, everyone else must be shatting themselves when you come calling then !
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So it's constantly cycling regardless of water use and firing up the combi? Is this where you get your efficiency figures for boilers from - not?

Others might well just despair of your constant knee jerk responses given without the benefit of a single brain cell.
IMM. The last M stands for misinformation.
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Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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wrote:

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 responses given

Hear hear!
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