Capping cold water tank off!!

[beesley121]

Hi guys,

Just been to a house as the new electric shower they have install has really poor pressure. Almost non existent.

The customer has plumbed the shower into his bathroom cold water pipe so it now cannot be changed as the bathroom is tiled.

To cut a long story short, what stops me capping the cold water off from the tank in the loft to the bathroom pipe work and connecting the bathroom cold water pipework to the mains supply?
The tank will have to be left in place as its the feed for the hot water cylinder

Any advice appreciated?

 

[Rickster123]

So the electric shower is off the tank?? Easy to swap over to mains mate but you will still find a pressure drop depending on how much of the cold supply is run in 22mm.

 

[stevetheplumber]

you can do that but if there are any mixer taps the supplies will be unbalanced

 

[beesley121]

So the electric shower is off the tank?? Easy to swap over to mains mate but you will still find a pressure drop depending on how much of the cold supply is run in 22mm.

yes mate shower is supplied from tank

Im stil relatively new to the plumbing game and always learning but can i ask why the cold water in this house is fed from a tank rather than the mains? understand why the hot is fed from the tank but dont understand why the cold is!! surely cold is better under mains pressure

 

[Destroyer2813]

Theres loads of houses out there where the cold water is feed of the tank keeps supplies balanced

 

[Best]

Gives you stored cold water if from a cold tank. Nothing wrong with gravity cold & hot if the taps suit the lower pressure.
Just remember the pressure may massively increase to the cold gravity pipework that you are thinking of swapping to mains, so hopefully it is sound.

 

[GasmanxxxR1]

If toilets are tank fed, you will need to change to high pressure ball valve

 

[petercj]

This thread might be worth a read - in particular post 13 by salamander rep.

http://www.ukplumbersforums.co.uk/showers-wetrooms/38578-decent-pressure-poor-flow-pressure.html