Help & Advice for fitting new bathroom

4 Apr 2006
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United Kingdom
I am planning on making some changes to our bathroom over the easter weekend and any help/advice would be greatly appreciated.
Firstly in the ensuite I am replacing the toilet and basin for a wall hung toilet, basin and shower
In the main bathroom I am replacing the bath & basin & shower over bath (that has no pressure) for a bath, basin, toilet and separate shower
Whilst I have done basic plumbing before, moved a radiator, put in an outside tap, I have never done anything on this scale
I believe I want thermostatic power showers (simply because you cant beat a good shower), I have a "normal" boiler (not combi), do I need the shower feeds to come from the tank or cylinder, because they are back to back would 15mm feeds from a bath to both showers be sufficient or would I need separate feeds. What about the electric supply, is a normal plug feed OK or do I need a separate breaker
Which order would you tackle this in or does it depend on the bathroom layout etc
What about the shutting down and removal of the old system, I was thinking about turning the water off capping off the pipes then switching back on so that the family can still use the downstairs bathroom.
How long would you suggest a competent DIYer should take?
Thanks for any help and advice given
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if its a power shower, a normal plug feed will definitely be out of the question. You will need to get a dedicated cable from the fuse box/consumer unit to the shower. I would suggest you get 10mm^2 as this will cover pretty much any power shower you can buy.

I would suggest if you can that you get hold of a load of isolating valves and use them to cap off, its easier to do that than unsolder end caps.

Some of the questions your asking I can't answer without actually looking at the install.

Good Luck

It's illegal to wire up your own bathroom.

BTW a power shower is just a pump and doesn't need 10mm cable. That's for a 10.4 KW Instant shower.

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The isolating valves are a good tip, except that the ones with little screw-head or plastic lever inside have a tight reduction inside which restricts the flow; just what you don't want for a good squirty shower. however, you can buy the next larger size, and use a compression reducer to fit them to the pipe. Gate valves don't look as good, but, when open, they do not obstruct the water flow.
Isolating valves are now a legal requirement.

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