Why Summer Is the Best Time to Service Your Boiler

In short

A gas boiler should generally be serviced annually by a Gas Safe registered engineer. Summer is a convenient time because heating demand is lower and any issues can be addressed before colder weather arrives.

On this page

• What a boiler service checks
• Service vs repair vs gas safety check
• Warning signs not to wait for
• Warranty and landlord responsibilities
• Pre-autumn heating checklist
• Frequently asked questions

What a professional boiler service typically checks

An annual boiler service is more than a quick visual inspection. A Gas Safe registered engineer will typically:

• Check the flue and combustion readings to ensure the boiler is burning gas safely and efficiently.
• Inspect the main components — heat exchanger, burner, ignition system and seals.
• Clean key parts where accessible and check for signs of wear or corrosion.
• Verify the system pressure and check the expansion vessel.
• Test safety devices such as the pressure relief valve and flame supervision device.
• Check that the boiler controls and thermostat are working correctly.
• Provide a service record that you can keep for warranty and reference purposes.

Service vs repair vs gas safety check — what is the difference?

These three terms are often confused but serve different purposes:

Warning signs you should not wait for the annual service

Some symptoms mean you should contact an engineer sooner rather than waiting for your annual appointment:

• The pilot light or flame keeps going out or looks yellow/orange rather than crisp blue.
• You smell gas — this is an emergency (see below).
• The boiler is making unusual noises — banging, gurgling or whistling.
• Pressure keeps dropping or rising outside the normal range.
• Hot water is not reaching temperature or the radiators are not heating evenly.
• The boiler frequently locks out and needs resetting.
• Soot or scorch marks are visible around the boiler.

If you notice any of these, contact Adrian for boiler repairs or call 07899 728506.

Warranty and landlord responsibilities

Manufacturer warranties: Many boiler warranties require an annual service by a qualified engineer to remain valid. Missing a service can void your warranty, so it is worth checking your warranty terms and keeping your service records. Booking in summer helps ensure you do not miss the annual window.

Landlords: If you rent out a property, you have separate legal duties. These include an annual gas safety check by a Gas Safe registered engineer and a gas safety certificate (CP12) for each tenancy. A gas safety check is not the same as a full boiler service, though they are often done at the same time. Always follow current gas safety regulations and seek professional advice if you are unsure.

Practical pre-autumn heating checklist

Here are some safe things you can do yourself before the heating season — none of these involve opening the boiler casing or DIY gas work:

• Turn your heating on briefly in late summer to confirm it fires up correctly.
• Check your boiler pressure is within the range stated in your manual (often around 1–1.5 bar when cold).
• Bleed any radiators that feel cold at the top (with the heating off and fully cooled).
• Check that all radiator valves turn freely and are not stuck.
• Clear any obstructions around the boiler and flue terminal outside.
• Book your annual service with a Gas Safe registered engineer — Adrian can help with boiler servicing.
• Keep your previous service records together for warranty reference.

Disclaimer: This article provides general guidance only. Always follow your appliance manufacturer's instructions and use an appropriately qualified professional for gas, electrical and plumbing work. Gas work must be carried out by a Gas Safe registered engineer.