Dedicated HW feed to shower from combi

[pls1]

We are getting a new Worcester Bosch 37CDi installed as part of a complete house refurb along with a new water main to replace the old lead pipe. House is 3 bed, one bathroom upstairs. Combi in utility downstairs.
We are wondering if it is worth installing a dedicated 15mm pipe run to the shower upstairs since using the existing pipework in the current configuration, the bathroom will be at the end of the pipe run (approx 10m from boiler). Everything else will feed off before the shower (i.e downstairs toilet, kitchen sink, utility sink).
If this is worth doing should we run dedicated HW and CW feeds or just HW? Shower will be thermostatic so in theory will regulate temp but would the dedicated pipework help with pressure drop?

 

[JonasX]

We are getting a new Worcester Bosch 37CDi installed as part of a complete house refurb along with a new water main to replace the old lead pipe. House is 3 bed, one bathroom upstairs. Combi in utility downstairs.
We are wondering if it is worth installing a dedicated 15mm pipe run to the shower upstairs since using the existing pipework in the current configuration, the bathroom will be at the end of the pipe run (approx 10m from boiler). Everything else will feed off before the shower (i.e downstairs toilet, kitchen sink, utility sink).
If this is worth doing should we run dedicated HW and CW feeds or just HW? Shower will be thermostatic so in theory will regulate temp but would the dedicated pipework help with pressure drop?

In your situation, that sounds like a very good idea. And maybe the cold as well.

Have you looked at flow regulators? They are an isolation tap and flow regulator all in one. A cartridge pushed in, gives the flow you want. Restrict the flow at taps and appliances. A basin tap only needs about 4 to 6 litres per minute as do washing machines, dishwashers and toilets. The shower can then be full on to get all the flow. Simple and easy.

 

[Dan Robinson]

Why cold as well? I can understand the hot in order to minimise water waste... but cold too?

 

[JonasX]

If other taps are turned on they affect the shower less or not at all. Flow regulators are being used in hotels to ensure adequate showers and to preserve hot water so they do not run out.

 

[pls1]

So are you saying have dedicated HW & CW feeds to the upstairs bathroom (tee'd off from the boiler) and then install flow regulators on everything else downstairs (toilet, kitchen sink, appliances etc) ?

 

[JonasX]

So are you saying have dedicated HW & CW feeds to the upstairs bathroom (tee'd off from the boiler) and then install flow regulators on everything else downstairs (toilet, kitchen sink, appliances etc) ?

I am saying have a dedicated hot and cold to the shower, all other outlets, hot and cold, have flow regulators on them. If the shower is in the bathroom, then no need for regulators for the bath. In-line isolation values are not flow regulators. Although flow regulators are an isolation valve as well. You pick the flow rated cartridge to what you want. Only a few litres a minute for say a basin on the hot and cold, which then does not spurt over you or guests when you turn on.