Should i go for an Unvented Hot water cylinder?

[marc1977]

Hi,

I am about to have an old asbestos water tank replaced in the loft and also have a new shower pump fitted, however it occurred to me if i switched to an unvented cyclinder i wouldnt actually need either of these.

Ive seen them in screw fix for about £550 which seems reasonable. I obviously wouldn't fit it myself so wanted to know how big a job is it to fit an unvented cyclinder - is it just a like for like pipe replacement in the airing cupboard or is there more to it? Are there any disadvantages over a conventional vented system I should be aware of?

Cheers

Marc

 

[Gasmk1]

it all depends on your water supply if it is only 15mm to the tanks it may need upsizing to an unvented you need a a certified installer to fit one also he can survey and advise

 

[Riley]

You need a minimum flow and pressure and this needs to get to the point of the cylinder install. Also you need to get safety pipework to an outside termination. Best bet is to get a G3 qualified engineer in to do the necessary tests

 

[Chalked]

Hi
Get a G3 registered plumber to come round.
He can measure the water pressure and flow rate and see if fitting one is suitable. Also will need checking for a route to get the safety vent to a suitable outside location.
It's worth getting installed, as it's much better than a noisy shower pump and gives the opportunity to remove the dirty header tanks in the loft.

 

[Chalked]

Hi
Get a G3 registered plumber to come round.
He can measure the water pressure and flow rate and see if fitting one is suitable. Also will need checking for a route to get the safety vent to a suitable outside location.
It's worth getting installed, as it's much better than a noisy shower pump and gives the opportunity to remove the dirty header tanks in the loft.

 

[Stanios]

If you have a gas boiler it will make more sense in most cases to get rid of any cylinders and tanks and fit a combi.
If not you can usually fit unvented right where open vented cylinder was, most manufacturers specify 20 litre per minute mains but unless you are planning on running two showers at once you can get away with less.