How Much Would a New Combi Boiler Cost in Grimsby? A new combi boiler installation in the Grimsby area costs between £1,800 and £3,500 fully installed, depending on the required kW output and system conversion complexity. We execute every combi boiler installation in Grimsby, Cleethorpes, Immingham, Louth, Brigg, Caistor, and Market Rasen on a fixed-quote … Continue reading How Much Does a Combi Boiler Cost in Grimsby?