Where’s the job?

Overview

• Installing gas boilers involves setting up the boiler unit, connecting the gas supply, and integrating the appliance with the central heating system.

• Skill level: 4 / 5 (requires detailed knowledge of gas fittings, flue systems and hydraulic connections).

• Typical duration: 1 – 3 days depending on existing infrastructure and complexity of the installation.

Safety First

• Always isolate the gas supply and electricity before commencing work.

• Ensure the installation complies with gas safety regulations; use a Gas Safe registered engineer for gas connections.

• Check all flue and venting components to avoid combustion risks.

• Never attempt gas pipe adjustments without proper training and certification.

• Conduct a gas leak test and pressure-test on the system before final commissioning.

Tools & Materials

Step-by-Step

1. Survey and plan – verify heating requirements, boiler position, gas supply and flue routes.

2. Prepare the site – ensure the mounting surface is level, and clear access for gas and water connections.

3. Install the boiler – securely mount the unit and connect it to the flue and venting system as per manufacturer instructions.

4. Connect gas and water supplies – these connections must be performed by a Gas Safe registered engineer. Follow electrical safety procedures for any wiring involved.

5. Commission the system – carry out gas leak tests, pressure-check the water circuit and ensure correct ignition of the boiler.

6. Calibrate and set controls – adjust the thermostat settings and ensure the boiler operates at optimal efficiency.

7. Final inspection – confirm all connections are secure, no leaks are present and the system meets all regulatory standards.

Completion Checks

• Boiler ignites with a steady blue flame and reaches the correct pressure.

• No gas leaks, error codes or abnormal noises are present.

• All safety and performance tests have been completed prior to handover.

• System documentation and certification details are provided.

When to Call a Pro Instead

If installing or modifying a gas boiler falls outside your skill set or if the work affects central heating regulations and warranty requirements, it’s essential to seek a Gas Safe registered engineer.