New Central heating but problems, Please help

[Dale Sanders]

Thanks for this.

I have measured all taps and the all cold measured around 14-15 Lpm and all hot is around 9-10lpm. The mains in is on 15mm until it gets to the loft transferring to 22mm it then runs the length of the loft to other side to where the boiler is situated.
Should I be lose 4-5lpm on flow just going via the boiler?

 

[Harvest Fields]

Thanks for this.

I have measured all taps and the all cold measured around 14-15 Lpm and all hot is around 9-10lpm. The mains in is on 15mm until it gets to the loft transferring to 22mm it then runs the length of the loft to other side to where the boiler is situated.
Should I be lose 4-5lpm on flow just going via the boiler?

Check the instruction manual for the boiler. It will tell you roughly what flow rates to expect at what temps. But as stated above this is a rough guide only and may not be spot on.

 

[Dale Sanders]

Max flow on hot is 13lpm at 40 c + 15%.
How can I increase flow as only getting 10lpm

 

[ShaunCorbs]

Under sized pipes if it's run from the mains to the boiler in 15mm also all hot in 15mm

 

[Dale Sanders]

Most of hot is in 22mm but mains in is 15mm from floor to loft then transferred to 22mm

 

[Harvest Fields]

All of this will have an effect.

 

[Dale Sanders]

What will be most effective to Do?
My options are:
Change 15mm main in to 22mm
240litre Accumulator on hot
Pump on the hot line

 

[ShaunCorbs]

change the 15mm to 22mm

accumulator wont work nor a pump

 

[Dale Sanders]

I am being advised by the guy who installed the system an accumulator will give me the max pressure the boiler can cope as effectively it's a storage of water so I can fill 2 baths at max flow.

 

[ShaunCorbs]

I am being advised by the guy who installed the system an accumulator will give me the max pressure the boiler can cope as effectively it's a storage of water so I can fill 2 baths at max flow.

Combi boilers will never fill two baths they struggle with one