30 Apr 2013
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United Kingdom
Cut a very long story sort. I am upgrading my heating and hot water system as it is an old floor standing gravity fed system without any zone values.

I have 2 bathroom and an on suite. 5 bedroom house with 7 people living here.

The 2 bathroom get used alot and currently have an old cylinder which is very small and old (red jacket one) and most probably full of limescale and sludge.

I have an cold water tank in loft and a shower pump which feeds in only one of the showers from the cylinder.

Both shower will be used at the same time and I would like a powerful shower.

So here the story so far:

I have had some plumbers in and various advise.

One suggestion is to instal a unvented cylinder and new boiler. (problem is the main is old lead pipe and then goes into a 15mm pipe. they have check the pressure at it is fine but the flow rate is under the recommend guidlines for a unvented. So 1 souluton was the upgrade the mains and hope for the best. second was to install a 100 gallon tank in the celler with a pump which will pump to the unvented cyclinder.

the other option is the have a upgraded vented clynider 300l and have a multi shower shower pump installed to the showers.


To have 2 100 gallon cold water tanks in loft and 3.5 pump. and also ungrade the vented cyclinder to a 300l one.

I am very confused and really dont know what to do so your help would be appreciated.

Like I said all I want is a system with is going to give me a powerful shower and enough hot water without having to wait 40mins each time two shower which is what happening currently.

Thanking you in advance
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Unvented cylinder. Accumulator tank to store water
at pressure. Old boiler will be fine assuming it is reasonable.
Upgrade controls and radiators/valves as necessary.
This assumes you have a reasonable mains pressure of approx 2-2.5 bar.

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