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Shower mixer tap fitting


 
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andek

from United Kingdom

Joined: 31 Mar 2012
Posts: 5
Location: Sheffield,
United Kingdom

PostPosted: Sat Mar 31, 2012 7:06 pm Reply with quote

I am considering replacing a failed electric shower with a set of bath taps with integral shower head. Cold water is off the mains and hot is from a vokera combi boiler. Hot feed to tap is 22mm fitted with a flexible pipe and cold is 15mm, also with a flexible pipe. If I fit the new tap/shower mixer to the bath and the existing pipes will there be any risk that the restriction of the shower head will cause the cold water to enter the hot line and flow back to the boiler. Would it be necessarry or advisable to fit non return valve to the tap inlets. Sorry if this is a dumb question.
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xr4x4

from United Kingdom

Joined: 01 Oct 2009
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Location: Hampshire,
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PostPosted: Sat Mar 31, 2012 7:13 pm Reply with quote

As the shower head can enter the bath water, as far as I know you need check valves.

To stop the potential of dirty bath water entering the mains cold supply via the shower head.
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andek

from United Kingdom

Joined: 31 Mar 2012
Posts: 5
Location: Sheffield,
United Kingdom

PostPosted: Sat Mar 31, 2012 7:19 pm Reply with quote

I intend to fix the head to the wall to be used as an over the bath shower so the head should not come into contact with the bath water. My concern is whether the shower head would cause back pressure in the hot sysytem.
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xr4x4

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PostPosted: Sat Mar 31, 2012 7:54 pm Reply with quote

I'm sure the shower head could still be left in the bath, so I think my point still stands.

As you are on a combi, it's mains pressure on both.
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andek

from United Kingdom

Joined: 31 Mar 2012
Posts: 5
Location: Sheffield,
United Kingdom

PostPosted: Sat Mar 31, 2012 8:00 pm Reply with quote

Thanks Paul, I appreciate I will have to fit a check on the cold as understand this is a legal requirement, correct me if I am wrong, I was unsure whether one was needed on the hot as well.
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xr4x4

from United Kingdom

Joined: 01 Oct 2009
Posts: 2906
Location: Hampshire,
United Kingdom
Thanked: 258 times

PostPosted: Sat Mar 31, 2012 8:03 pm Reply with quote

I would assume the combi will have a check valve built in for the hot, but you may have to wait for more responses on that.

Cold, yes.
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