Surrey flange questions

5 Oct 2023
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United Kingdom
Morning all,

We've moved into a house which has a Salamander shower pump fitted underneath the bath, supplying the bath mixer taps with shower.

The pump is very noisy as it has been run directly from the hot & cold water feed without any flange fitted on the hot water cylinder.

I am looking to fit a surrey flange but the tee for the bath hot water is inaccessible (under the floor), I only have access to the main hot water pipe leaving the cylinder.

My question is, can I fit the surrey flange so that the air free outlet provides air free hot water to all hot water outlets via the main hot water pipe, and the normal outlet goes straight to the vent in the loft (i.e. I won't have a seperate tee for the shower pump). Diagram below explains:

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I have never seen one but imagine it should work OK except you draw off huge volumes of HW elsewhere while using the shower/pump.
The Surrey flange should stop air getting through and help direct it up and out the overflow.
Limescale can build up around the neck in hard water areas.
The vent pipe take off should be has direct as possible.
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