New Central heating but problems, Please help

[ShaunCorbs]

Yes I am aware of that but currently it's doing 10lpm so any more will be an advantage

I would do 22mm to the boiler that should sort it unless your mains flow is 10lpm

Any ISO valves on the hot pipework that arnt full bore get them changed as well

 

[Dale Sanders]

Mains flow is 14lpm.

Do you think the 15mm is restricting it

 

[ShaunCorbs]

yea

 

[Dale Sanders]

Why don't you think an accumulator will benefit my system? Why won't it work

 

[ShaunCorbs]

Why don't you think an accumulator will benefit my system? Why won't it work

because you will have 10lpm coming out, they dont increase the flow

 

[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

 

[Dale Sanders]

Am I getting a new bathroom and want a powerful shower. Can I put a boost for water pressure on the shower?

 

[ShaunCorbs]

Am I getting a new bathroom and want a powerful shower. Can I put a boost for water pressure on the shower?

Nope as your on a combi

You need to think about if your going to need two outlets open at the same time e.g. Kitchen tap and shower etc if you are, you have the wrong system

 

[Dale Sanders]

What system do I need and what can I do too change

 

[ShaunCorbs]

What system do I need and what can I do too change

Three options but both require a new boiler

One heat only boiler with a unvented cylinder
Two heat only boiler and gravity cylinder with a pump
Three storage combi (Viessmann 222) depending on your mains flow maybe an accumulator if less than 20lpm

 

[Harvest Fields]

Also with it being in the loft you will instantly be on a downer as the pressure has to travel up three floors before reaching the boiler. Upgrade the pipes to the boiler. You should get more flow as long as you have the pressure in the mains

Edit. Got to be a cheaper option to start with

 

[Dale Sanders]

Why can't I just put an accumulator on my combi.

 

[ShaunCorbs]

Why can't I just put an accumulator on my combi.

Can't put it on the hot side

And cold side your only getting 14lpm through the boiler

 

[Dale Sanders]

No I'm getting 10lpm through the boiler

 

[ShaunCorbs]

No I'm getting 10lpm through the boiler

Yea but that's because of the 15mm pipe or mains supply not the boilers fault

 

[Dale Sanders]

So how does an accumulator work