Because you read regulation and don't think. You have not come up with one reason why it is technically not safe. Nor one. Even the reg you stated was meaningless.
That is why he is uprating the pumping. The keeting I'm pretty sure is scale left over from mains pressure operation.
Quoting regs again, and using no brains. BTW, men made the regs, they never came down with Moses.
Not in engineering. I don't see a reasoning engineering mind here, just a reg quoter.
Yep.
The mans said it was a temporary measure until money is available for a condensing boiler. He doesn't want to touch the gas part, so only worked on the water. The condenser he says will be installed by professionals.
He originally asked question re: condenser, and then thought about keeping the multi-point for a while, as that is what they do in the USA, and asked relevant questions. He was intelligent enough to see there was no safety risk whatsoever, so went ahead. No one thought he would but he did, and it works. Once he de-scales the kettling will go away.