Shower buying advice

Cardew

ncobo1664 wrote: »

I've read in a few places that my regular boiler wouldn't be compatible with a pressurised HW cylinder and that I'd need a system boiler. Is this not the case?

Also seems to be a risk that the pipes might not be able to handle pressurised water flow. I think we have headroom in the attic so I'll lok into raising the cold water tank.

I believe either boiler(regular or system) can be used with an unvented cylinder see:

https://www.boilerguide.co.uk/articles/vented-and-unvented-hot-water-cylinders

The 'pressurised' hot water flow is no higher than the mains cold water supply, so why would the pipes not handle this pressure?

Mutton_Geoff

ncobo1664 wrote: »

I've read in a few places that my regular boiler wouldn't be compatible with a pressurised HW cylinder and that I'd need a system boiler. Is this not the case?

Also seems to be a risk that the pipes might not be able to handle pressurised water flow. I think we have headroom in the attic so I'll lok into raising the cold water tank.

What sort of boiler is it? Make/model?


I have just converted my house to unvented hot water ("pressurised"). The pipes are fine, it's the toilet ball valves & tap washers etc that start leaking when they are subjected to main pressure water instead of a cold tank in the loft. The install of the unvented system also balances the hot and cold pressures via a valve, so your shower would work better in this case.


I'd be tempted to follow this route and put the £400/£500 cost of installing and redecorating a pumped local shower with an unvented cylinder.

ncobo1664

This is my boiler: https://www.worcester-bosch.co.uk/products/boilers/directory/greenstar-ri-12kw-to-24kw

The cold water pressure from the taps is high so I'd assume the hot water taps/pipes would be able to handle mains water pressure.

Can someone recommend an unvented HW cylinder if I do go with this option please?

Cardew

ncobo1664 wrote: »

This is my boiler: https://www.worcester-bosch.co.uk/products/boilers/directory/greenstar-ri-12kw-to-24kw

The cold water pressure from the taps is high so I'd assume the hot water taps/pipes would be able to handle mains water pressure.

Can someone recommend an unvented HW cylinder if I do go with this option please?

Your link showing your boiler lists the Worcester-bosch cylinders all with a 25 year warranty:
https://www.worcester-bosch.co.uk/products/cylinders/directory/greenstore-unvented-cylinders

I have a Gledhill 180 litre unvented cylinder - also with a 25 year warranty. I will let you know in 20+ years if it is reliable!

matelodave

I've got a Daikin 200l unvented with 25 years warranty but with only 18 years to go.

Most of them are stainless steel, have a decent 25 year warranty and are usually a lot better insulated than your average hot water tank, so in the end you pays your money and takes your choice.