You’re looking at an average boiler installation cost of £2,300 for a combi, including vat and installation below you’ll find some typical direct from the manufacturer unit only prices for popular brands. Please respect my work, recipes and photographs if you do use a recipe in your own writing, please give proper credit and link back to the original post. Fill out our form below to get in touch with our team! We will contact you by phone to. If you are interested.