Hi folks, I'm trying to get my head around ongoing issues we have with our rental home boiler and central heating system, so I'm coming to you specifically about the boiler, please.

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We have a Boulter Buderus Camray 5 boiler (at least that's what the casing says) and inside it is what says it is a Riello RD3 burner (specifically, the certificate says burner model Dzzt, though I cannot see that on the actual casing, but there is a stuck on label that says 'Riello 502T5K'). On our annual oil installation check certificate (like an annual gas safety check) it says the boiler runs at 89.5% gross efficiency, whereas online sources say lower, 81%.

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https://www.homeheatingguide.co.uk/efficiency-tables?model=004157#:~:text=The Boulter Camray 5 Combi,Oil as its fuel source

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When the plumber visited, I asked him how this was possible, and he said 'it's had some parts.'

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We've been arguing that a 19 yo boiler can't be efficient enough. Even with new parts, isn't that efficiency what it was considered to be when it was new? Can parts even improve it past that?!

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Our house is 1460 square feet, 3 bed, 2 lounges, 270 years old, thick limestone walls with no insulation and no floor insulation. Someone in another thread told me it's probably not a good enough boiler for the house, can anyone confirm?

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Not asking for legal advice, but this is a bit more info on why I am asking:

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https://www.reddit.com/r/LegalAdviceUK/comments/rf1iiq/can_we_get_out_of_our_lease_due_to_ll_not/

Thanks for reading and any opinions.