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Except ... Few systems actually work like that except at relatively high load. Especially when the boiler is grossly oversized because it has to be to act as a moderately effective combi, it cannot handle the low flow rates when the TRVs are throttling back. Hence while the return temperature...

I would agree with that. I'm sat now in a house that was previously a council house (been a number of owners since the original council tenant bought it). Around here I think there's something like around 1/3 of the houses still under HA ownership, with 2/3 now being privately owned. - which is...

Tsk, that would be 2.27kWHr kW is a measure of power flow, kWHr is a measure of energy. It's a very common mistake. And 2.27kWHr over 24 hours is about 95W. But, some combi boilers can have higher standing losses. About 13 years ago now I fitted a thermal store in our rental flat, and had just...

If you have the skills to do it safely, as mentioned before you can do : IR tests. If there's anything on the low side you can investigate that and deal with it. Continuity tests. r1+r2 on everything, and of course, check all the rings are actually rings. Plus one not mentioned - check for...

If you take that strawman to it's logical conclusion then every part of every installation is C2. What has changed over the years (and wiring regs revisions) is attitude to risk. So just sticking with RCDs, go back long enough and just having stuff earthed so as to create protection by blowing...

When doesn't matter, what matters is what condition it's in now. If it had been a nice metal cased CU with RCDs (quite pricey back then) then it would (assuming no faults) still be complaint now. Since it doesn't have any RCDs then it's not compliant. IF the parts are still available then it...

Not an expert by any means ... If it were me, I'd be looking to keep the lift pump and filter arrangement as is. As Madrab says, seal the header tank(s) so the only ventilation is via a filter to stop "things" getting in, and insulate them well so that a) they don't freeze in winter, and b) they...

It would stop the boiler condensing as well. For maximum heat transfer (and hence fastest recovery time for the cylinder), you want maximum flow rate - delta-T across the boiler and coil will be low, but delta-T between coil and cylinder contents will be maximised and so power drawn from the...

Hmm, not quite that simple - is tax ever simple - if a business is involved. See https://www.gov.uk/government/publications/chattels-and-capital-gains-tax-hs293-self-assessment-helpsheet/chattels-and-capital-gains-tax-2021-hs293#wasting But not likely to be an issue for someone trading stuff on...

Now now gentlemen (though I use that term loosely given the evidence of the last few posts), let's keep this civilised.

Yes !

Stirrup pump and suitable adapter ?

One question you haven't answered yet (unless I've missed it). If you partially close the tap, i.e. significantly reduce the flow rate, does the water get warmer ? A fundamental problem with any instant water heater is the limited power. Basically flow rate times temperature rise times specific...

Stand by for some earache for daring to mention that. Been there :( I used to joke that in an office with 10 women, you'd get 11 opinions as to desired temperature. Not only that, but demands that there be no air movements - nor when cooling, any cold air. I'll also add the tendency fir the...

I would suggest that it's not very important in terms of heating costs. After an initial warm up, it's just stored heat. Where it does come in is when considering how much energy can be saved by backing off the heating in unused rooms. If you have massive thermal masses and good insulation, then...

The thing is, if that's what's needed to heat the house, then that's what's needed. If the heat pump can't cope then something isn't sized right for the installation - or it's just one of those 0.1% of the time that the right sized system isn't design to handle. That means, a lot of the time, a...

While agreeing, I would suggest that the manufacturers don't want a reputation for faulty or unreliable boilers. I have seem manufacturer liveried vans turn up when an installer has clearly been struggling - in one such case the neat install turned into a bit of a mess by the time they'd swapped...

Getting back to the original discussion of where some myths come from ... I'm sure some it comes from misunderstanding. (cough) years ago when I was adding an IMC rating to my pilot's licence, I had a 'bit od a disagreement' with my instructor. It concerned limitations of DME (distance...

Doesn't need much research - it wouldn't work ! It can help make a system work better (by varying rad temps with outside temp, it can minimise the problems of 'all or nothing' hot rads in mild weather and not enough heat in cold weather), but without internal sensors/controls it can't work...

Rather than put it into the boxing, I'd suggest chasing in a plaster box and bringing the cables into the back of that. Mount it a little higher up the wall, it'll stick out a lot less than the pipework boxing and be less prone to damage. You'll have a but of damaged wall around the box for a...