DIY Doctor

15mm HW Cylinder Outlet to Shower Pump - Can I Make a Join?

Postby Guinea Pig » Sat Nov 08, 2014 10:15 am


I wonder if anyone can help as I've spent hours scouring all of the posts and responses and am still not sure I've found the answer.

I've bought a S Turner Showermate Eco 2 bar twin pump. Needs 22m inlets on both H&C. Cold is fine as have separate feed from CWS in loft (just need to remove last bits of cold feed pipe as it reduces down from 22mm to 15mm in airing cupboard for some reason).

My issue is with the HW feed from the cylinder. There's an Deleted flange already fitted which runs off at 22mm before disappearing under the floorboards. This supplies the shower in our en suite. Before it drops down, there's a tee off and reducer to 15mm. This then runs as 15mm pipe to feed the shower that was originally in our bathroom (which I'm replacing 'cos it was rubbish flow etc).

My question is as follows: can I simply make a join to the 15mm pipe (keeping it 15mm for as short a run as possible from the HWC) and then increase to 22mm and run onto the pump, without seeing a serious drop off in flow? I'm a bit of a novice at these things as you can tell (!) but was wondering whether I'm wasting my time i.e. if there is any 15mm "upstream" then won't this dictate the flow I get to pump (regardless of how long or short that run of 15mm happens to be ?.

I know the simple answer is to probably replace the tee at the flange to 22mm but there is zero room to work in + I'm worried about upsetting the join of the flange to the HWC (which looks a bit dodgy possibly anyway!)

Would really appreciate anyone's help.

Guinea Pig
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Simply Build It

Postby proptech » Sat Nov 08, 2014 6:26 pm

Hi Guinea Pig

You really need to drill the cylinder and install an Deleted flange, or use a surrey flange at the top in order to create an entirely new and separate supply.
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