15mm cold supply feeding two bath rooms

[Mgrant]

On a house that is plumbed up in 15mm pipe for the cold mains. Feeding a bathroom and an ensuit next to each other. Would the shower in the ensuite not likely struggle when some one is using the bath in the bathroom next door. Are both feed of the same 15mm pipe.

 

[Old Account]

It all depends what sort the of pressure at the mains is and how long the runs of 15mm pipework is ... As well as how old the installation is because of hardened water could scale a lot up.

 

[ShaunCorbs]

in short yes but wouldnt recommend it 22mm if you can

 

[lame plumber]

in short yes but wouldnt recommend it 22mm if you can

come again?

 

[townfanjon]

James, depending on your hot water , gravity / combi etc , that could be more of an issue .

 

[Mgrant]

guessing teeing of the main 15mm run separately for the ensuit and bathroom wouldn't make any difference? Is that correct? Than teeing off once to pick both up if anything that would give a longer pipe run.

 

[ShaunCorbs]

come again?

wouldnt like to run two showers off 15mm but it does happen

 

[Mgrant]

Would be one shower and a bath

 

[plumben]

Ideally would run 22mm from the stop tap although the water main to the external stop tap could be 15mm or equivalent I/D

 

[lame plumber]

unless you are happy to ensure you have a 35mm mdpe cold main into the house and then run a 22mm cold feed around the house, just live with a 15mm set up as it is.

 

[Radioman]

Is this 2 electric showers or 2 gravity showers?

 

[rocketmanbkk]

Supply pipes usually in 22mm reducing to 15mm when needed.

 

[Mgrant]

Why would I need a 35mm mdpe supply. Couldnt a 22mm cold on the.first fix be.used.off a 25mm mdpe supply. And its a 30kw combi so will likely struggle on the hot water.supply anyway.

 

[plumb_know]

Why do you not just take pressure and flow rates from taps and then discuss with customer there usage and make a informed decision on this? If can be replaced from stopcock in 22mm relatively easily without too much damage then recommend this to customer but ultimately give them the relative information and then let the customer decide how they would like to progress?

 

[Mgrant]

guessing teeing of the main 15mm run separately for the ensuit and bathroom wouldn't make any difference? Is that correct? Than teeing off once to pick both up if anything that would give a longer pipe run.

Any anyone explain this teeing off the 15mm cold separately for the bathroom and ensuite wouldn't make any different as its only 15mm pipe you are drawing from. Would make a difference if the main run was 22mm though?

 

[lame plumber]

Why would I need a 35mm mdpe supply. Couldnt a 22mm cold on the.first fix be.used.off a 25mm mdpe supply. And its a 30kw combi so will likely struggle on the hot water.supply anyway.

your the one panicking about cw supply flow rate and pressure, just offered the best option............

 

[rocketmanbkk]

As I said runs should be in 22mm. Then 15mm to fittings if need be. Can't it be changed

 

[ben5192]

id try to get a 22mm supply in