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thanks for your prompt replies. I will seek more information about the project and post again later.

Underfloor heating is being installed as part of job that includes a ground floor located boiler. It has been proposed that in addition to a manifold for the zone adjacent to the boiler a second manifold (requiring a dedicated pipe from the boiler running to it) is required for the second zone...

Thanks for the direction. I've found what I needed. V. prompt reply, good job.

I want to replace one ceiling light with two lights fed from the same junction box both operating from the existing light switch (so they both come on at the same time) I can replicate the wiring for one of the lights but for the other is it ok simply to add it to the junction box with the...

you are right, of course, I didn't understand it. That's why I asked the question. Pity you could not help as I still don't understand.

thx for reply. I'm thinking that my non maxi boiler has a set of gas burners and two pipes flowing through them - one CH, one hot water. one or both could be on at any one time and the same amount of gas is burnt to heat one or both. or is this not the case. Even with the thermostats...

Hi, I know that the water for both the CH and hot water is pumped around and through the boiler where the gas heats the water as it flows through. My question is: when the hot water is being heated but the CH off does the same amount of gas burn as when both CH and hot water is turned on...