Not happy with with new unvented system, although it works fine. Shower pressure issue

[SJB060685]

Before I comment further can a pump be used for hot water outlets on an unvented cylinder @ShaunCorbs?

 

[Gasmk1]

this seems to point to your cold water main not being adequate

 

[EvilDrPorkChop]

What your plumber is suggesting is incorrect. You can't pump out of an unvented cylinder, you cannot also pump the cold from the tank and then have the hot supplied from the unvented.

He clearly doesn't know what he's doing, you need to get someone else in who can advise you much better.

As @ShaunCorbs says when need to know you incoming pressures, which you've been asked for a few times yet haven't provided them. You need to know these before you make any decision on what route to take.

 

[kash]

What’s your mains pressure ?

nothing open ?

one tap open ?

I cant remeber if i'm honest and I don't have a guage. However, as i've mentioned before, pressure at the taps is perfectrly fine at the moment, when the showers are not on.
[automerge]1577373831[/automerge]

What your plumber is suggesting is incorrect. You can't pump out of an unvented cylinder, you cannot also pump the cold from the tank and then have the hot supplied from the unvented.

He clearly doesn't know what he's doing, you need to get someone else in who can advise you much better.

As @ShaunCorbs says when need to know you incoming pressures, which you've been asked for a few times yet haven't provided them. You need to know these before you make any decision on what route to take.

I will try to get these readings.

As for what he's suggesting, i've only wrote what I think he think he said - i could be wrong.

 

[Gasmk1]

pressure at the taps being fine doesnt mean you are getting the right flow to cope with 2 showers and all other serices toilets and basins

 

[SJB060685]

This is what I was going to say Pork Chop. Plumbing is not my thing but I always believed no pumps on unvented and certainly not mains hot hot and boosted cold, how would they be balanced? If at all. As we all said the incoming mains pressure and flow rates is the first thing you check before considering mains hot water.

 

[ShaunCorbs]

Before I comment further can a pump be used for hot water outlets on an unvented cylinder @ShaunCorbs?

not for the outlet but you can pump the supply to it eg break tank and pump if pressure is an issue

but it sounds like flow is the problem but until we get some figures we can’t say

 

[kash]

What your plumber is suggesting is incorrect. You can't pump out of an unvented cylinder, you cannot also pump the cold from the tank and then have the hot supplied from the unvented.

He clearly doesn't know what he's doing, you need to get someone else in who can advise you much better.

As @ShaunCorbs says when need to know you incoming pressures, which you've been asked for a few times yet haven't provided them. You need to know these before you make any decision on what route to take.

He told me it was measured at 1.6bar before he started the work. Not sure what it is now - need to re-measure when he is next here.

 

[SJB060685]

1.6 bar is not good for unvented. As I said above, around that pressure you need a breaker tank and pumped mains with accumulator.

 

[ShaunCorbs]

Ok when he’s here next week get him to fill this out

Pressure static (no outlets open eg just the pressure gauge open) is _______ bar
Pressure dynamic (one additional outlet open) is ______ bar
Flow static (one outlet open) is ______ Lpm
Dynamic (two outlets open) is ______ Lpm