Wall insulation is an even bigger money-saver but has to be installed by a professional, and the type of wall insulation will depend on what type of home you live in. Combi boilers are not suitable for larger properties with 3, 4 or more bathrooms. All debit and credit cards accepted. Call today for your free estimate! No matter what type of boiler your household has our team of experts can quickly diagnose and repair your boiler using quality components and parts,.