What happens during a boiler service?

Sep 26, 2025

What happens during a boiler service?

Regular boiler servicing is essential for keeping your heating system safe, efficient, and reliable. Many homeowners in Godalming and Guildford book their annual service to prevent unexpected breakdowns, lower their energy bills, and protect their warranty. But what actually happens during a boiler service, and why is it so important?

A Step-by-Step Look at a Boiler Service

A boiler service is more than just a quick check. It’s a thorough inspection carried out by a qualified heating engineer to make sure your boiler is working properly and isn’t putting your household at risk. Here’s what you can typically expect during a professional gas boiler service in Guildford:

Visual Inspection

The engineer starts by inspecting the boiler and surrounding pipework. They’ll look for any visible damage, leaks, or corrosion. This step is important because even small signs of wear and tear can lead to bigger issues if ignored. For example, spotting a minor leak early could save you from a costly repair later.

Safety Checks

Safety always comes first during a boiler service in Godalming or Guildford. The engineer will test all the safety controls, including the pressure relief valve and thermostat. They’ll also check ventilation and flue routes to ensure harmful gases like carbon monoxide are leaving your home safely. This is one of the most crucial parts of the service, as carbon monoxide is a serious health risk.

Cleaning of Key Components

Over time, dust, soot, and debris can build up inside the boiler. During the service, the engineer will clean important parts such as the burner, heat exchanger, and condensate trap. Cleaning keeps your boiler running smoothly and prevents dirt from causing efficiency problems or damaging internal components.

Efficiency Testing

Using specialist equipment, the engineer will test how efficiently your boiler is burning fuel and whether it’s producing safe emissions. If the boiler isn’t performing as it should, they can make adjustments to improve efficiency. For homeowners in Guildford and Godalming, this not only means a safer boiler but also lower energy bills.

Service Report and Recommendations

Once the checks and tests are complete, the engineer will provide you with a service report. This outlines everything they’ve inspected, cleaned, or adjusted. If any repairs or replacement parts are needed, they’ll explain what’s required and give you advice on the best course of action.

How Long Does a Boiler Service Take?

A typical gas boiler service in Guildford usually takes between 45 minutes to an hour, depending on the type and condition of your boiler. It’s a small amount of time for a big return in safety and performance.

How Often Should You Book a Boiler Service?

Most engineers recommend booking a service once a year. For homeowners in Godalming and Guildford, the best time to arrange this is in late summer or early autumn. This way, your boiler is fully prepared before the colder months set in.

Book a Boiler Service in Godalming or Guildford

We offer thorough and reliable gas boiler services in Guildford and Godalming. Our qualified engineers will carry out a full inspection, clean your system, and ensure everything is running safely and efficiently. Call us today or complete our online contact form to book a service.

Have a question? We can help.

Our blog is a great starting resource but we understand that sometimes it's best to talk to a real person. Please feel free to get in touch and we'll be happy to help.

Get in touch

Button Icon
CTA Image