"Kevin Campbell" wrote in message
...
Hi,

I am replacing my current 20 yr old HW cylinder and am considering
installing a mains pressure unvented system to remove the need for a
shower pump.

The installation instructions for some of these cylinders describe
particular building regulations to follow etc. and it does not look
overly complex but is the installation something that can be legally
carried out by a proficient diyer or does it require a professional.

Looking at the supplier web sites there seems to be quite a variation in
price between Thermasaver, Heatrae and Albion. Is there a significant
difference between them or does anyone have particular experience of
installing and commisioning them?

Kevin,

Unvented cylinders require a BBA approved fitter. Not a DIY task. A DHW
only heat banks is superior in many aspects and can be DIYed. Some versions
don't even require an overflow pipe to the outside. Unvented cylinders are
at high pressure and require complex pressure reducing and control valves
and kit. Heat banks are at low pressure and still give full mains pressure
hot water.

Unvented cylinders require annual servicing. If one bursts (and when they
go they go with abig insurance job) your insurance company may not pay out
if it is not serviced each year, and certainly if not fitted by a BBA
fitter.

See:
http://www.heatweb.com
http://www.range-cylinders.co.uk (go to thermal storage)



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