unvented advice please

[taydo]

Hi all

I am first fixing a three story house with three bathrooms.

Will 15mm pipework for hot be ok or should it still be run in 22mm.

My unvented course is not until september so I am not up on this type of system yet.

Thanks
Brian

 

[oilman]

What is the cold pipework? The cold supply should be taken off after the pressure regulator so it is balanced by the hot for showers etc. and should be the same size for hot and cold.

 

[taydo]

Thanks oilman
cold pipe work will be in 15mm so I will balance the hot with 15mm

 

[kevplumb]

last one i fitted reccomended 22 cold feed or you dont get the flow rate according to mis

 

[ChrisR]

The important one is the one in from the road, to your cylinder. If you're using an internal airspace variety that will smooth out flow difficulties on the HOT a bit. You don't get that benefit with external pv types.

You'll only get out what you can get in. Measure CW flow into loft costern with the funnel etc removed. If you're only getting 12l/min you'll have hopeless showers from your uvhwss unless you do something about it. Consider an accumulator or pump set if that's the case. This is NOT a DIY project!