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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...

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...

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...

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...