Am I mad? Here's my reasoning: The current boiler is 10 years old, on it's last legs, and will probably struggle with the extra radiators we added (hope it gets through the winter) The hot water storage tank fills an entire cupboard, which could be put to better use. We don't have baths, only showers. The shower pump is extremely noisy and we've had problems with it (I'm assuming this won't be needed with a combi) A combi will be more efficient and reduce my gas bill