Combi AND Unvented. Good idea or not?

[webbster]

I've just had a Worcester B 37 fitted. My wife isn't happy about the loss of pressure when anyone flushes a loo or runs at tap while in the shower.

I'm considering adding an unvented cylinder to offset the loss of pressure when running two things at once but would it be worth first getting a wider pipe out to the street mains before going down the Megaflo route?

 

[Agile]

An unvented cylinder will give exactly the same problem.

The solution is to upgrade the water supply.

One wonders what muppet installer fitted a combi to an inadequate water supply!

Tony

 

[ALEC1]

tony is only partly correct...the issue could be pipe sizing in the house and obviously a toilet that has an unregulated supply..

I have a 4l/m flow restrictor on my wc...solves that sort of problem to an acceptable level..

alternatively you could just put the right injector in the ball valve for high pressure

 

[dcawkwell]

As per the other post a restrictor on the toilet to stop a peak demand.

A cold water accumulator tank will happily keep a store of pressurised water for the house.

An unvented cylinder would be exactly the same problem so the accumulator tank is necessary.

Failing this upgrade water supply to house but you may be in a bad area and this may not cure the problem if there is poor pressure.

Fitting tap aerators will also help.

 

[oph]

if I was redoing my place agin I wouldn't have bothered with an unvented.

Its a big ' if ' but if we do end up loosing our water supply as a result of lack of water this summer then the citizens of 2012 are going to be whining a dam sight more than the ones of 1976. The reason? So many unvented and combi fed systems resulting in WC s being direct fed off the main whilst back in '76 , I was 3 in case you were wondering , 95% of the housing stock had a 50 gallon tank so there was SOME back up at least

 

[webbster]

Thanks for the replies all. dcawkwell - so this accumulator tank; how does that connect into the boiler if it's not being fed directly from mains?

And presumably it can go anywhere? (am thinking up in the eaves of our loft)

 

[dcawkwell]

Thanks for the replies all. dcawkwell - so this accumulator tank; how does that connect into the boiler if it's not being fed directly from mains?

And presumably it can go anywhere? (am thinking up in the eaves of our loft)

It just needs to connect into the mains cold pipe in the house.
I would have said 100 to 200 litre tank.
There will also need to be a check valve after the mains stop cock to hold
the water pressure in the house.

 

[Agile]

An upgraded mains supply is by far the best solution. Not favoured by installers as they cannot make so much money out of it.

But before doing anything you need to measure the static pressure and the dynamic flow rate at say 1.0 bar.

Tony