"Tim Downie" wrote in message
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Doctor Drivel wrote:
"Tim Downie" wrote in message

You've said it's possible with BCO checking in another post. You
seem a bit confused.

That is not DIY as such.

Is that the sound of backpedalling I hear?

Not at all. You can install it with BCO approval, if he decides he wants to
take it on. You can install it all and leave it dry and have an approved
man check, fill, test and sign off. Either way it is not DIY as in
installing a gas boiler, as a professional is involved with the unvented
cylinder installation.

You clearly cannot service any part of the cylinder as a DIYer and they need
one every year. They are a waste of expensive time, use a vented heat bank,
far, far better and does the CH too and can be DIYed and no expensive annual
service.