Wondering if your boiler needs repairing or replacing? Electric boilers are more efficient than boilers that run on natural. But when is the right time to replace your boiler, and what should you be looking for in a newer model? Start your search by typing in the business name below. Vaillant ecotec pro kw condenser combi boiler, good condition, good working order, before you buy can see working, including all fittings flu.