On 12/03/2018 22:03, John Rumm wrote:
On 12/03/2018 15:47, Cynic wrote:
Unless you have cause to think the crusty pipe connections may fail
I'd suggest you don't fix what isn't busted. Do note that installing
an unvented cylinder should be done by a competent and certified
installer.


Incorrectly installed it is a potential bomb.

While often stated, I am not convinced this is anything other than a bit
of FUD that serves the makers of combis etc well. Yes you can turn one
into a bomb in theory, but you would have to try *really* hard...

Firstly you are not going to super heat any cylinder with a boiler as
the primary heat source. So you would need to use an immersion as the
primary heat source.

Secondly, they come pre equipped with at least two safety interlocks
(over temperature and over pressure relief valves). You would have to
defeat both.

Lastly the immersion heaters also come with a thermostatic control and
separate overheat protection. You would need to defeat both of those also.

(probably worth keeping in mind that an vented cylinder can kill you as
well)

I think
there's a requirement for building regs approval for swapping a
vented one now as it comes under conservation of energy but iirc
prelagged complies as long as the temperature controls are up to date
and immersion stat is compliant.

It also comes under G3 - where the proper venting requirements,
sanitation protection, and thermostatic mixing requirements are specified.

https://www.planningportal.co.uk/inf...ter_efficiency




What happned to the thermostatic control that limits the temp at the
tap to no more than ?50. Did this ever become a building regs
requirement ?.