New Central heating but problems, Please help

[Dale Sanders]

Don't they store water so will push water at max flow through 22mm pipe as they compress?

 

[Harvest Fields]

Don't they store water so will push water at max flow through 22mm pipe as they compress?

I see you logic here but upgrade the pipe and iso's

 

[Gasinspect]

Chap I work with always increases mains to combis in 22mm all the way. He doesn't win jobs on price, but gets a lot from recommendations.
At home I only have 15mm but family have learned not to turn tap on when anyone the shower. Even thought of putting a solenoid valve on mains but managed so far. also we turn dishwasher and washing machine off. You learn to live with it. Worse at 7-8 in the morning when incoming pressure low. Might put in mains boost pump.

 

[Dale Sanders]

I am struggling to understand.
I have spent 5 grand on a new combi boiler to control heating and water from electric storage rads and electric thermostat controlling the water in a cylinder. The hot flow was as good as the cold.
I am prepared to spend more money to get the flow up but what is a guaranteed fix to improve flow on hot?

 

[Harvest Fields]

Upgrade pipe as stated before and as shauncorbs has said change ISO valves to full bore.

 

[Dale Sanders]

Ok will do. Thanks.

 

[ShaunCorbs]

Are you wanting to run more than one outlet at the same time tho ?

 

[Dale Sanders]

I have just been up in loft and was under impression by my plumber that he changed to 22mm up in loft but it runs 15mm from mains in all the way to the boiler.

 

[Dale Sanders]

Yes I would like too run 2 outlets at the same time

 

[ShaunCorbs]

Yes I would like too run 2 outlets at the same time

I have just been up in loft and was under impression by my plumber that he changed to 22mm up in loft but it runs 15mm from mains in all the way to the boiler.

There's your problem you won't get 14+ lpm out of 15mm with elbows etc

Sorry to say you will struggle to have two outlets open at the same time With a combi

Best option would be heat only boiler and unvented cylinder if your flow and pressure are ok