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Can you recommend a quality brand I should look at replacing it with?
Idk where your boiler is located, but it's also worth checking if changing the make/model will change installation costs.
Our heating engineer seemed decent and honest, and said that if we wanted to change model the installation would cost more due to flu(?) and pipework. So we replaced our WorcesterBosch like-for-like. Cost was £2100 all in.
Obvs I no real way of validating his statement, but it seemed logical and £2100 felt about right.
I personally wouldnt have spent any money on that but that's where your at now.