How much does central heating cost to install? we have added to our popular guide to show costs for installing a full central heating system (new boiler and new radiators) in a 1 bedroom flat, 3 bedroom house and 5 bedroom house. Tree roots damaging drains in de1. Calls may be recorded and monitored for quality and training purposes our call centre is open 7 days a week 364 days a year. All our boiler repair options include. The.