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IMO open vented and UFH is just bad practice. Air locks, more risk of dirt in system (Imagine a blocked UFH circuit!), more noisy. TBH running UFH off that boiler anyway wouldn't be ideal, they need a new boiler and system upgrade! UFH running more often, the HW is always going to be on due to the gravity. There's loads of reasons for suggesting an upgrade is due.
I agree with you, I did suggest ages ago but they were adamant on keeping the same system. I just want to tap into the right pipes, get it running and walk away to be honest.