I had a look at the actual legislation/approved documents for this recently and found that they have a somewhat stricter deinition of "competent" than other similar regulations, but it still wasn't black and white to my untrained (legally speaking) eyes.
If it was myself, I would approach the building control department and see if they are willing to proceed and follow their advice. Actually, if it were me, I'd do no such thing, as I was in exactly the same position as you, but decided to install a DPS Pandora instead, that doesn't require G3 approval (just L, which doesn't require specific qualifications).
Well, yes and no. I did a DIY install of an unvented HW cylinder (assuming that's what you mean) but I did not seek approval.
a) I know I did it "by the book", and tested it properly "by the book". I used a Telford Tornado - this has excellent instructions, and Telford were very helpful indeed. b) we are intending to stay in the property for many years (5 so far,
4 of them with the unvented cylinder) so are hoping that by the time we sell no one would care if it had a certificate. c) that if we do sell, we have a choice of a retrospective regularisation certificate if the solicitor demands it, or replacing with a standard vented unit if for some reason we can't get a certificate. The work involved in replacing the cylinder is minimal (in my case).
That's the theory anyway - ask me if/when we come to sell whether it works out like that :-)
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.