How to achieve equal water flow when extending bath pipes?

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Hello and thank you for looking at this post, its probably a repeat matter.

Part of my bathroom refit is the installation of a shower above the new bath. There are pipes there for the bath (which is going in the same place as the old bath, two taps).

The shower will be fitted to the wall above bath taps.

Can the existing bath hot and cold water supply pipes just be t-ed to link to both bath and shower and will this achieve equal flow rate if there happened to be both shower and bath taps on at the same time, ie no hot or cold surges to shower if bath taps then switched on.

Thank you for looking at this post.

This is a temporary bathroom for about a year until an extension is constructed and bathroom is fitted professionally.
 
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Tell us a bit more about what plumbing system you have. That would help.

Why would you be running a bath, and having a shower at the same time, anyway?
 
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Thank you for your reply.

The pipes are under the floor boards.

The heating is conventional boiler to hot water storage tank.

Probably would not have bath taps going at same time as shower but would be preferable to install shower appropriately if there is a standard way from tee-ing off from pipes to bath taps.

Thank you again for your reply.
 
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Do you have equal pressures on your bath taps?
Ie: Cold and hot fed indirectly via a cold water storage cistern.
Equal pressures are a must for thermostatic showers. For non thermostatic, not so much so, but a lot easier to blend if you have equal pressures.
 
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Thank you for your reply.

Cold water tank sits above hot water cylinder.

Hot and cold water pressures about the same.

Must be both from cold water tank as when mains tap was switched off, cold water tank needed to run down before old bath could be removed.
 
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You will have a problem with bad flow to your shower head at its highest point in that case. The problem you have, is the height of your head of water. You will get a flow of water through your shower head if you hold it down at bath tap height, but as you raise it up to a level to be able to stand under it to shower.. the flow will decrease to a dribble or nothing at all.
 
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