Unvented pipe diameters for hot/cold.

[andy.budgell]

I have one bathroom and one kitchen.

The current hot water pipe to the bathroom is 22mm. It splits to the kitchen at 15mm.

Cold water to bathroom and kitchen are both 15mm.

My question is when I get my unvented hot water cylinder installed, I obviously need a 22mm cold to the cylinder, but what about cold to the bathroom and kitchen. Does this need to be uprated to 22mm?

I'm going to have a thermostatic mixer shower in the bathroom.

Thanks
Budgie

 

[WelshMan]

nope the 15mm in place is perfectly fine m8.

 

[andy.budgell]

Thanks taff.

At the moment though, if you're running a cold tap and someone flushes the loo, there is a big drop in flow of the tap.

If I'm showering with the new unvented system, I presume in this case there will be a drop in pressure with the shower? Can this somehow be aleviated?

Can I fit pressure reducing valves on the cisterns so it doesnt refill at full tilt?

 

[sooey]

Whats your water pressure and flowrate like coming into the house.

 

[corgiman]

Thanks taff.

Sheesh how racist, you'll be calling a sheep worrier next

I ask ya

Tut tut

 

[gas4you]

Thanks taff.

At the moment though, if you're running a cold tap and someone flushes the loo, there is a big drop in flow of the tap.

If I'm showering with the new unvented system, I presume in this case there will be a drop in pressure with the shower? Can this somehow be aleviated?

Can I fit pressure reducing valves on the cisterns so it doesnt refill at full tilt?

I always run balanced hot and cold in 22mm and t off to each outlet in 15mm.

You will get a pressure reducing/balancing valve with your unvented cylinder, if yo have more than 3 bar incoming pressure it will reduce pressure to this so eliminating the above problem.

 

[andy.budgell]

Thanks taff.

Sheesh how racist, you'll be calling a sheep worrier next

I ask ya

Tut tut

Theres a knock at the door. I think I'm being taken in for that comment. What is the world coming to.

 

[andy.budgell]

Thanks taff.

At the moment though, if you're running a cold tap and someone flushes the loo, there is a big drop in flow of the tap.

If I'm showering with the new unvented system, I presume in this case there will be a drop in pressure with the shower? Can this somehow be aleviated?

Can I fit pressure reducing valves on the cisterns so it doesnt refill at full tilt?

I always run balanced hot and cold in 22mm and t off to each outlet in 15mm.

You will get a pressure reducing/balancing valve with your unvented cylinder, if yo have more than 3 bar incoming pressure it will reduce pressure to this so eliminating the above problem.

Thanks Dave. Useful info.
Seems to make sense.
Just hope my plumber will do that. I'll ask him.

 

[WelshMan]

granted i off far less experiance than gas4you but i dont see the point in upgrading your 15mm to 22mm. With the 15mm being at main pressure surely this is more than sufficient to run to your bathroom and give you good pressure?.

Dont worry about the Taff comment, been called a lot worse in my time

 

[gas4you]

Pressure will be ok but quantity be be better especially if more than one tap used at a time.

 

[gas4you]

Deleted same as above. Why does this site crash with funny messages so often