Straight Combi Boiler Swap Process

Pre-Installation

• Survey the existing installation and confirm specifications

• Isolate water supply and drain down the heating system

• Safely disconnect and remove the old combi boiler

• Check existing pipework and flue routes for compatibility

Installation Work

• Position and securely mount the new combi boiler to the wall

• Connect gas supply pipe and test for leaks

• Connect cold water mains supply with isolation valve

• Connect central heating flow and return pipes

• Install or adapt flue system (horizontal or vertical as required)

• Fit condensate drain pipe to waste

System Connection

• Connect to existing radiator circuit

• Flush the system if required to remove debris and sludge

• Add inhibitor and system cleaner as needed

• Install magnetic filter if not already present (recommended)

Testing & Commissioning

• Pressure test all gas connections

• Fill and pressurise the heating system (typically 1-1.5 bar)

• Power up and fire the boiler following manufacturer's sequence

• Check all heating zones and hot water operation

• Test safety devices and controls

• Balance radiators if necessary

Final Steps

• Complete Building Regulations compliance certification

• Register the new boiler with the manufacturer for warranty

• Demonstrate controls and system operation to the customer

• Provide all documentation, manuals, and certificates

• Clean up and remove old boiler and waste materials

prices may vary upon inspection