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Hi, I wouldn't get too worried about your roof falling in on you - it'll be many years before that happens, even if there is a damp/rotting problem. I would want to be confident that there is a ventilation space between the rockwool and the sarking felt, and that there is a route for the air...

Thanks, SimonH2 Here's a (rough) picture of what I have in mind. This was just lashed up dry, the short bit of pipe will be longer, and the joints soldered! You can see, there will be a small air lock either in the elbow if I do it as in the picture, or the crossover if it's the other way...

I want to use a half (or part) crossover in a horozontal pipe run to cross over a pipe which runs parallel to the rafters in a loft (i.e. it slopes). One side of the crossover feeds directly into an elbow connected to a pipe parallel with the one crossed over. (The reason for this is to get the...

You could try buying a couple of cheap thermometers (similar to eBay #320784550136). Put the sensors in unused sensor pockets (if there are any), or strap them to pipework as close to the cylinder as possible (use thermal conductive paste and cable ties). Try one at the top HW outlet, and one...

Thanks, D_Hailsham, that tells me what I needed to know.

Thanks, D_Hailsham, but the ports aren't marked. The ones on a Horstmann valve are.

The answer, I suppose, like the reason for climbing Everest, is because I've got it. If it gives me grief, well, I've been warned. A Horstmann valve I encountered today looks as if the flow tends to open the valve (but it was plumbed in, so I can't be sure).

I'm about to fit a secondhand ("Pre-owned"/"Pre-loved"/Recovered - call it what you will) Lifestyle motorised valve. Question is: which way round does it go? (a) so that the flow tends to close the valve flap (and the motor has to overcome the spring and the flow in order to open the valve), or...

The possible use (at the design stage only, at present) is to get the pipes from a solar panel through a (Uralite) slate roof. I had ideas of using an Alpha Slate Vent...

Thanks, guys. I'd hardly expect the stuff to burst into flames when heated to 100 degC (boiling water temperature) but I wondered if it might melt (maybe giving off nasty fumes as well). Half the idea of using it touching the pipes was to provide insulation without creating a draught hole...

I've recently been close to a (contractor's) job which involved fixing Celotex sheets. A quantity of offcuts remain, and I have a possible use for some. This would involve copper pipes passing through the Celotex. The pipes carry water which may reach 100 degC. Does anyone know how Celotex...

Thanks gents. Yes, newboy, this looks right, and moggett, you've answered my question. I suspect I confused where the overflow kit would be used, since I was looking for a cover for an F&E tank, and stumbled upon this screen warning item in the process. Just wondered what it did.

Whilst trying to locate a new lid for an old CW tank, I encountered "screen warning pipe elbow" as part of a kit of bits for installing a F&E tank. Please can someone tell me what a "screen warning pipe elbow" is, what its for etc. Something to do with Bylaw 32? Please excuse the ignorance.

Going back to the original question .... If you look at several threads about secondary DHW circulation, the question is sometimes asked about alternative pumps to the Grundfoss bronze bodied ones (because they look like a heating circulator, but are 4x the price). So when I see a cheap pump...

Not declared by the manufacturers in their Installation & servicing instructions, but as they make a Solar diverter valve (similar to Combisol) for use with this boiler, that diverts Solar heated water straight to DHW at 60 deg C, but into the boiler if its less, it would seem that it would...

Ridiculous? Explain why?: Here's the history/reasoning: We deliberately chose a combi capable of taking preheated water to replace our ageing (and leaking) oil fired boiler and LP HW system. The preheated water would be from a [new UV] cylinder heated (using its primary coil) by solar panels...

Thanks for the info, Gasguru. It looks as if this pump was never intended to pump water, so its not going to be useful in my application. (which was in a kind of DHW secondary circulation system with one outlet, to get 'instant' solar pre-heated water from a UV cylinder to a remote combi [via...

I'm toying with using a Vaillant 16-0108 pump for an application which is nothing at all to do with a Vaillant boiler ('cos I can get one cheap). As the pump is listed as a spare for several boilers, I scoured this site to try to find out exactly what it does in these boilers. If I knew, it...

As the system warms up from cold (first thing in the morning, for example) check which end of the rad gets warm first. This is the 'flow', or inlet end. If your valve's on the other end, then that's why its thumping. The water needs to flow in the direction of the arrow on the valve body. It...

I'm looking into installing a secondary circulation system, but I can find precious little information or comment about it. Any help, please? Does anyone know where to start looking for a suitable pump? It doesn't need to be capable of much flow (0.5 litres/min ?), but does need to operate under...