Boiler Replacement From £1900 Including boiler with 5 year warranty. Boiler Service From £60. Safety and maintenance inspection of domestic gas boiler. Boiler Repair From £50 Diagnosis of fault including up to one hour labour. Final cost will be calculated following diagnosis. Fire Service From £60 Safety and maintenance inspection of domestic gas fire. System Power Flush From £300 Chemically treat and machine power flush heating system. Landlord Safety Certification From £50 Landlord safety certification as per legal requirements. Back Boiler and Fire Service From £80 Safety and maintenance inspection of domestic domestic back boiler and fire. Full Central Heating Installation From £3100 Boiler with 5 year warranty, Stelrad radiators and pipework. Landlord Safety Certification and Service From £70 Landlord safety certification as per legal requirements, plus service/maintenance inspection.