Boiler 9 October 2026

Gas Safety Certificate vs Boiler Service: Are They the Same Thing?

No, a gas safety certificate and a boiler service are not the same thing, and having one does not give you the other. A gas safety check is a safety inspection of every gas appliance and the pipework in a property, recorded on a certificate; a boiler service is maintenance of one appliance to keep it running properly. They are different jobs with different paperwork, and the mix-up catches landlords and homeowners out every winter, so here is how our engineers explain it on the doorstep.

What a gas safety certificate actually covers

The document most people call a gas safety certificate is properly the Landlord Gas Safety Record, still known everywhere by its old form name, the CP12. A Gas Safe registered engineer inspects every gas appliance the landlord has provided - the boiler, the hob, a gas fire, a gas cooker - together with the flues that serve them and the gas pipework through the property.

The pipework gets a tightness test to prove there is no leak. Each appliance is then checked for safe operation: that it is burning at the right rate, that the flue is carrying the products of combustion outside and nothing is spilling back into the room, that there is enough ventilation, that it is physically secure, and that its safety devices work. The engineer is answering one question: is this installation safe to leave in use today?

What the check does not involve is taking anything apart. If an appliance fails, the engineer makes it safe, which can mean turning it off with the owner’s permission, and the record says why. Every appliance is listed with the checks made, the result and any defects. It is valid for 12 months.

What a boiler service covers

A service is maintenance of the boiler alone, and it goes a great deal further on that one appliance than a safety check does. Our guide to what a boiler service includes walks through the full list, but in short the engineer runs a flue gas analysis to see how the boiler is burning, inspects the combustion chamber and case seal, cleans the burner and heat exchanger where they need it, clears the condensate trap, checks the expansion vessel charge and system pressure, tests the safety devices and looks for seals and components that are starting to wear.

The point is to keep the boiler efficient, keep the warranty valid and catch wear in autumn rather than meet it as a breakdown in January. It produces its own paperwork too: a service record in the Benchmark logbook, which the manufacturer will ask to see before honouring a warranty claim.

Is a gas safety certificate the same as a boiler service?

They overlap just enough to cause the confusion. Both must be carried out by a Gas Safe registered engineer, both involve the boiler, and both include some of the same checks on its flue and safety devices. The differences are in scope, depth and purpose:

• Scope. The gas safety check covers every gas appliance and the pipework. The service covers the boiler.
• Purpose. The check asks whether the installation is safe to use. The service asks whether the boiler is working as well as it should and will keep doing so.
• Depth. The check is an inspection and a set of tests. The service opens the boiler up, cleans and adjusts it.
• Who needs it. Landlords must have the check by law. Nobody is legally required to have a service, but the warranty almost always demands one and the boiler lasts longer for it.
• Paperwork. The check produces a Landlord Gas Safety Record, a legal document the tenants are entitled to a copy of. The service produces a service record for the logbook.

Does a gas safety certificate include a boiler service?

No. A pass on the record means the boiler was safe on the day of the check. It says nothing about whether the heat exchanger is scaling up, whether the condensate trap is half full of sludge or whether the expansion vessel has lost its charge. We attend rental boilers across west and mid Kent with a decade of clean certificates and no service ever, and they are the ones that lock out in the first cold week. Our water is hard, so the scale builds whether anyone is looking or not.

It works the other way round as well. A service does not produce a Landlord Gas Safety Record. A landlord who has the boiler serviced each year and assumes the legal duty is covered has no certificate to show, and the hob and the gas fire in the lounge were never looked at. Our post on what a landlord gas safety certificate costs and covers goes into the legal side in more detail.

Do homeowners need a gas safety certificate?

There is no law that requires an owner-occupier to hold one. The duty falls on anyone letting residential property: landlords of houses and flats, rooms in a shared house, and holiday lets all count. A landlord must give existing tenants a copy of the new record within 28 days of the check, give new tenants a copy before they move in, and keep each record for two years.

Some homeowners sensibly ask us for a gas safety check anyway: when buying an older house with appliances of unknown history, or where an elderly relative lives alone with a gas fire that has not been lit in years. For most owner-occupiers, though, the useful annual visit is the service, and you can book a boiler service with us online or on 01732 792 454.

Can you do a gas safety check and boiler service at the same time?

Yes, and for a let property it is the only sensible way to do it. One engineer, one visit, one set of keys from the agent, and the tenant is disturbed once rather than twice. The engineer checks every appliance, then services the boiler while stood in front of it, and you get both documents.

The boiler service is a flat £95+VAT, and a second gas appliance such as a fire or hob serviced on the same visit is half price. The gas safety check is quoted separately per property, because the price depends on how many appliances there are to inspect, and we will confirm it before anything is booked. Our landlord gas safety certificate page explains how we handle single properties and portfolios.

How long does a gas safety certificate last?

Twelve months from the date of the check. The detail most landlords never use is that you can have the renewal done up to two months before the current certificate expires and keep the original expiry date. Renewing early costs you nothing in time.

That matters now. If your certificate runs out in December, the window to renew it opens in October; January and February expiries open up in November and December. Having it done early, with the service in the same visit, means the property goes into the coldest months with a safe installation and a clean boiler, rather than waiting for a slot in the busiest fortnight of the year. Do it once and the expiry date moves to a quiet month for good.

What our engineers see on Kent lettings

The same few situations come up every winter, and all of them are avoidable:

• The last-minute certificate. An agent rings in the second week of December because the record expires on the 20th. The check is straightforward, but the boiler has not been serviced in years, and the engineer is noting defects rather than fixing them.
• The gas fire nobody uses. The tenants have never lit it, so it was forgotten. It fails its flue spillage test on the day, and now there is an appliance turned off, a tenant to reassure and a decision to make about removal or repair.
• The homeowner with a certificate but no service. They were told the certificate “covered the boiler”. It was safe. It was also so scaled that it failed the week after.

Any work on a gas appliance, whether an inspection or a service, must be carried out by a Gas Safe registered engineer. Plumbing Angels are registered under number 951167 and cover Kent from our Tonbridge base. If you are a landlord with a certificate due this winter, or a homeowner who wants the boiler looked at before the cold arrives, call 01732 792 454 or book through our landlord gas safety certificate page and we will sort both in one visit.