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Where can I buy five core cable in which the conductors have the same colours as most central heating two-port zone valves (i.e. grey, orange, blue, brown, earth). Thus is so that I can re-route some cable runs. I know I could use five core with other colour schemes, and I can get plenty of...

Having given up on the arrival of MJPotts, I have ended up implementing a hemp and boss white solution. There are many things about the other suggested methods which I'd prefer, but I happened not to have fibre or gasket material handy, access was difficult for brazing, and finally I suspected...

In an outcome I was not anticipating, the plumber did not turn up at all! No word responses to my attempts to find out why the no-show. I'm now beginning to wonder if words to the effect of "we can't really fix that without replacing the cylinder" were a sort of code for "we are not going to...

I've tended to keep going back to a company whose past work for me I've been happy with (which has not been the case for the first two plumbers I found after moving to the area, who I think did terrible work). But it's always good to have other recommendations as I am sure that is more than one...

Two weeks ago I noticed a cylinder union was leaking on our vented copper domestic HW cylinder. I booked a plumber to come, and (supposedly) he is due to arrive this afternoon. The long wait was essentially them clearing their new year break backlog. About one week ago I noticed that the leak...

Update: Since posting I have spotted elsewhere on this forum a diagram showing a heat exchanger like the above in a boiler. The link to the diagram is here: https://www.diynot.com/diy/media/untitled.35425/full That diagram calls the hemispherically capped pipes the "gravity flow pipe" and...

I know that many of the modern thin-plate heat exchangers in boilers have four ports -- and I know that on many of these, one pair of ports serves as an in+out for hot water, while the other pair served as an in+out for the central heating. But why do some older boilers which (I presume) have...

I insert the attached solubility graphs, (see foot of post) as I have to admit (ahem!) that I didn't know how very differently the solubility curves of gasses behave compared to those of salts/sugars/ionic-solids. From my school chemistry I had only remembered solubility curve which rose...

Dear @MJN , Yes, you are correct that the gas going off does indeed correspond to the hottest part of the cycle, as the gas turning off is controlled by the boiler detecting its cutout temperature. I don't know what that temperature is exactly in centigrade or Fahrenheit, as I've never...

We have an open vented S-plan system with an old (but ultimately quite reliable) Ideal Classic NF50 gas boiler. This is one of those older systems where a small controller is in charge of the two zone valves, the pump and the power to the boiler. When one (or both) valves are open and the pump...