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Thank you all. The strainers have now been cleaned and i am now told that the flow issues are due to poor installation and that the balancing valve has been installed incorrectly - have uploaded the pic if it helps.

I got it serviced but none of the valves were changed. Thank you.

I was told that the megaflo balancing valve has gone rubbish and needs replacing which will improve the flow rate. Is that true? By the way, one more advantage of replacing my lead with mdpe is that affinity water are going to replace theirs for free now - initially they quoted around £3k.

I dont know all the answers - but i am a keen student and i like to learn more and reconfirm if my understanding is correct!!

It depends on how much you can see and how far you can think!!!

Can someone please confirm what should be the expected average flow rate at internal stop cock with a 25mm MDPE? I know it depends on other factors but a ball park will be helpful.

Thanks Madrab i have always had this issue but i only moved into this house last year. And i have not ignored anything. I am trying to understand the real problem before getting things done. If you cant help its fine - no one is forcing you to.

I think its harsh to say that upgrading mains is waste of money when accumulator costs as much and is more hassles considering the space it occupies and if there are 2 showers or bath taps open at the same time, the accumulator of a decent size runs out in 10-15 mins. So even though i appreciate...

Thanks. I am still not sure if servicing megaflo will resolve my flow rate issue. With 25mm MDPE coming in from street and with pressure over 3 bar (dynamic), I am not sure why my flow rate is below 10 litres per minute?

No the megaflo pressure doesnt drop when a hot tap is on. On the megaflo it is written that operating pressure should be 3 bar but its only 2 bar. How frequently should megaflo be serviced and how much does it cost? Thanks

No idea when was megaflo last serviced and even if it was, it was def before 15 months. Left the lead pipe in there. There was no reason to pull it out as the contractors could bypass the new line without touching the lead

More update - the flow rate on one of the cold water tap (feeding directly from cold main via softener) is 15 litres per minute - still not enough with 25mm MDPE. However when the pressure is checked from a kitchen cold water tap which feeds from megaflo, the flow rate drops to 6litres per...

Bypass from water softener didnt work.any other ideas what could be restricting internal flow rate despite 25mm mdpe coming in with a 5bar static pressure?

Today, I got the pipe upgraded from the external stop cock to the internal one. The old 15mm lead pipe was left in as redundant and a new 32mm MDPE pipe was installed from external stop cock. The pressure on the internal stopcock is 5bar but flow rate is still low and the pressure from megaflo...

The water flow is 12 litres per minute in an internal tap feeding directly from mains and pressure is 3 bar - confirmed by water company

Hello, I live in a house which has 3 bathrooms with an unvented water heating system (megaflo). Currently the size of water mains coming into property is 15mm lead and hence the problem is when the bath tap is turned on in the first floor bathroom, there is no water in the second floor...