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Yes, there's quite a variety out there and I think I've found something close enough in terms of dimensions in some Camdenboss ones at Farnell: A bit steep when you factor in the P&P and low-value handling charge but could be an option. Potentially even better though; I emailed Honeywell...

I'll give that a try - thanks. That said, someone here that sees these day-in-day-in might well pipe up and say something along the lines "Honeywell use them in all their products - just buy a cheap so-and-so and cannibalise it!"... or is that overly wishful.

This is a long shot... almost worth not typing but you never know! I've just bought a Honeywell T6 smart thermostat - sold as 'untested; spares or repair' and I can see why! The receiver doesn't have any terminal blocks to wire to as seen (or not!) below: I have managed to lash up some...

Understood, and it was the use of the same term to describe flow/return difference that has the potential to cause confusion hence me urging caution: It's no big deal though; I could just see the confusion creeping in.

It's not so much that the water/vapour can't escape (although this is of course true), it's more the case that once sufficient water has evaporated to saturate the air space (to 100% relative humidity i.e. the point at which it cannot hold any more water) then condensation starts to form...

Be very careful with this terminology. Whilst the term 'delta T' in the generic sense can refer to any difference in temperature values, in the heating world (and radiators in particular) it usually refers to the difference between the temperature of the room and the average temperature of the...

Middle would be 55mm </pedantry> ;-)

When you say 'an awkward gap for getting a silicone nozzle in' do you have the long cartridge guns in mind? If so, you can also get silicone in toothpaste-type tubes which ought to be fine for manoeuvring around the inside of the sink. If it's not clear how the sink comes out I think I'd be...

Totally understand, and you don't have to explain. For what it's worth, they (we) meant well. There was a *lot* of effort put in by many to try and resolve your issue(s). I'll leave it at that. Finger's crossed for you; I'm sure you'll get there.

Is that you Zoot?

Did you say it was 7 months old? If so, could you get the installers back and get them to take a look?

I'm no expert so just thinking out loud here, but perhaps the answer is 'with difficulty'! If the root cause of the common failure mode of flexi tails is compromise of the outer braid (resulting in the inner rubber tube unable to contain the pressure) then this strikes me as an issue of...

I'm just guessing but it wouldn't surprise me if noise created within a pipe might well appear to come from the radiator. Or even if the noise really is coming from the radiator, the cause might still be in the pipe. This must be a common issue so hopefully one of the pros will be along with...

What's the remedy?

Do the radiator pipes feed come down vertically (i.e. from the floor above)? If so, I've seen (heard?!) similar before and have put it down to what might be some sort of air lock in the pipes (or valve?) that allows water to pass but in a fashion that is noisy and doesn't actually shift the...

It's because a device located next to a radiator and bolted to a hot water pipe is not well placed to measure an absolute temperature of the room. What you therefore need is just a relative measurement (hence the 1 to 6) and you can adjust it up and down until the desired comfort level in the...

I don't have the practical experience to back this up but from my recollection of physics at school I would expect the pressure in a sealed system to *increase* if hydrogen was being produced, not decrease. (Edit: Or have I just assumed the pressure has been decreasing itself, not just as a...

If plumbers aren't plumbers what are they? (I fear it's going to have the word engineer in it... ;-))

The reason the water flows through a radiator is down to the pressure differential that the pump creates between flow and return. If you connect both ends of a radiator to the same branch (eg the flow in #3 and the return in #4) then there'll be no pressure differential hence no flow. It's like...

An IR thermometer or pipe clamps will tell you the flow and return readings - the average of those will equal the average temperature across the radiator.