15mm Water Meter and MDPE Lead replacement

[beaker141]

My water bill states I have a 15mm Water Meter.

I currently have a lead water main, giving me 12 litres/min from the kitchen tap with the aerator nozzle removed and brass stopcock fully open.

I am looking to get a Megaflo and System boiler to replace combi next year and I want to change the water main in readiness to hopefully improve the flow rate to more like the 20l/min minimum that the Megaflo wants.

Q. The bit I stuggle with, discounting pipe length and resistance being lower the bigger the pipe diameter, but with a 15mm meter, if I then fit 25mm MDPE (or even 32mm) I assume the Water Board will just fit an adaptor on my 25mm to their water meter at 15mm. I then have a restriction to 15mm right at the start of the system?

I have searched everywhere and cant find much on this topic of 15mm water meter, certainly nothing suggesting people request a bigger bore water meter from their water board.

Can anyone here advise?

Thanks

 

[Charnwood]

I think you'll find the vast majority of domestic properties have 15mm copper tube where it enters the building complete with 15mm stop cock and - if fitted - a 15mm/½" water meter.

 

[PetePlumb]

Speak to the water board. I'm pretty sure they have meters for 22mm supply.

 

[beaker141]

I should clarify my Meter is in the pavement outside my front garden.

Ive read all about United Utilities free replacement scheme for lead pipes and its what I want to do - its just the connection of a monster pipe to 15mm that I dont figure.

If as a poster said - they can give me a 22mm meter great - but I've not come accross any info on their site to that effect nor seen anything in forums about it either?