We are contemplating on converting half of our double garage for extra living space. The existing boiler is a system boiler (with unvented Megaflo cylinder for HW) which is located in the space which I want converted so I’m thinking of relocating it to the unconverted part of the garage. I’m wondering if it’s worthwhile replacing the boiler altogether at the same time as I will be paying for most of the labour to move the boiler anyway. The boiler is a 7 year old Potterton Suprima 80L which reading about it online is known to have some fundamental issues. I’ve not had any major issues with it myself, though we only moved into the house only a few months back. I do notice however, because our bedroom is directly above the garage, hearing the boiler firing quite frequently i.e. once every 3-4mins. So every time it fires it doesn’t run for any long periods of time. It is on BG Homecare and the service didn’t pick anything up. I see the efficiency rating is 78% whereas most boilers these days are +90%, will this difference warrant some substantial savings?