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Hello, I am one of the experts on Just Answer and pleased to be able to help you with yout question.
Whilst alterations to systems to assist people with disablities can be zero rated a failed heating system scarcely comes into this category.
However the reduced rate, 5%, is available where:
'Installation of energy saving materials; and grant funded heating system measures and qualifying security goods'[VAT Notice 708] so if you can swing this then your bill will be reduced.
That is the best I can do, personally I think you will be chancing your arm trying to swing this repair at the reduced rate, sorry.