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In a combi or unvented set up, all outlets share the incoming mains water so that has to be your starting point. Get it tested for pressure and flow rate because if it can't supply enough water, neither option will give you what you are after. A cold water tank, vented cylinder and pumps can...

If you want a combi and an unvented to supply hot water at the same time, the mains cold water supply needs to be up to the job. If you currently experience a drop in shower performance if a toilet is flushed or a cold tap opened, then it is likely that you could spend a lot of money for very...

Wrap the pipes in felt or foam insulation and fill the void with a sand cement mix. Hopefully the 15cm is pipe centres.

If the cistern is filling really slowly and its spraying, it is likely to be a Siamp fill valve. Does it look like this one...

Yes, those are the mounts. I'd use copper but plastic should be fine if used correctly and inserts are used. No wiggle room on the 150mm centres as those are the pipe centres on the bar valve. I have a piece of plywood with 2 holes drilled the correct distance apart which I use to hold the...

I would fit a bar mixer using a fixing kit. https://www.screwfix.com/p/swirl-bar-valve-wall-mount-fixing-kit-chrome/8669h Remove tiles to cut out existing mixer and locate hot and cold pipes. Extend pipes and add elbows so they come straight out of the wall. Level and 150mm apart. (hot on left...

PTFE on the olive, not the threads.

If the valve was closed and numerous safety devices failed then that is a possibility. The regulations, however, have to take the worst case scenario into account even if very unlikely.

Its going to constantly spray the inside of the inspection chamber with sewage slurry so I'd say its certainly not a good idea. Almost certainly not allowed by regulations either but I don't know for sure.

It looks like your shower has Mira Airboost. It is supposed to mix air with the water to give the effect of a more substantial shower flow. Not really convinced it works that well but it does mean that you need the correct Mira shower head. You may be able to remove the airboost tube from the...

Yes its a problem. No valves are allowed on the safety vent. If you want to add a valve to the hot distribution pipe, it must go after the Tee on the downwards section of the vertical pipe.

The main black body needs to turn anticlockwise and the white basket base should stay still.

Contact ourbathroom.com They recondition aqualisa processors and should be able to advise on what is compatible and supply as new quality units considerably cheaper than buying new.

A leak down stream of the meter would result in water passing through the meter and a forward movement of the dial. Only reason I can think of for backward movement would be thermal expansion of water in the pipe if its warmer under your floor than in the water main. This would only be a tiny...

I like the Suprima despite the PCB problems in its earlier days. However, given its age and rotted flue, I wouldn't chuck any more money at it. Too many variables to give a definite idea of price but 3k doesn't seem too far off the mark. Get alternative quotes and see how they stack up...

Never a good idea to conceal compression fittings and certainly not iso valves which have a habit of leaking. If you must have the fitting concealed, use a straight pushfit connector from plastic to copper and have the iso valve where you can get to it.

Better to keep both sides open so that it doesn't create a deadleg with stationary water and the possibility of stagnation and bacterial growth.

I didn't look too closely at the pipework in the pictures and didn't notice it was secondary circulation. Its job is to push hot water round a loop bringing it closer to hot outlets so that it doesn't have to come all the way from the cylinder each time a tap is opened. They are expensive as...

Doing it day in day out gives you the confidence to know what should work and that the trickle of water is not going to turn into a torrent. Any pro will also be able to tell you tales of when things have gone wrong. You laugh about them later but not funny at the time. I usually have a wet vac...

The first thing the engineer should do is determine whether the fault lies with the boiler or with an external component. Pumps are a regular cause of tripping electrics. The fact that yours looks like it does points to it being the cause. The wiring looks like a poor diy job and certainly...