Posted on: 30 July 2026
If you’re looking for a heating engineer, you’ve probably come across the terms Gas Safe and OFTEC. But what do they actually mean, and how do you know which one you need?
The answer depends on the type of heating system in your home.
Gas Safe and OFTEC are the two main registration schemes for heating engineers in the UK. They help ensure work is carried out safely, legally and to recognised industry standards.
In this guide, we’ll explain the difference between the two and when you should look for each accreditation.
What Is Gas Safe?
The Gas Safe Register is the official register for engineers who are legally qualified to work on natural gas and LPG appliances.
If you have a gas boiler, gas fire, gas hob or any other gas appliance, the engineer carrying out installation, servicing or repairs must be Gas Safe registered.
Gas Safe engineers are regularly assessed to ensure they remain competent to work safely with gas appliances.
What Is OFTEC?
OFTEC (the Oil Firing Technical Association) is the trade association and registration body for technicians who work on oil-fired heating systems.
If your home is heated by an oil boiler, you should choose an OFTEC-registered technician for:
- Boiler installations
- Annual servicing
- Repairs
- Commissioning
- Oil storage tank work
Like Gas Safe, OFTEC registration demonstrates that an engineer has been trained and assessed to work safely and competently.
What’s the Difference?
The main difference is simply the type of fuel.
| Gas Safe | OFTEC |
|---|---|
| Gas appliances | Oil-fired appliances |
| Natural gas & LPG | Heating oil (kerosene) |
| Gas boilers | Oil boilers |
| Gas fires | Oil heating systems |
| Gas cookers & hobs | Oil storage tanks |
Which One Do I Need?
It depends on your heating system.
If you have…
- A gas boiler → choose a Gas Safe engineer.
- An oil boiler → choose an OFTEC technician.
Some companies, including solv, have engineers qualified under both schemes, allowing us to work on both gas and oil heating systems.
Why Does Registration Matter?
Heating systems should never be worked on by someone who isn’t appropriately qualified.
Using a registered engineer helps ensure:
- Safe installation and servicing
- Compliance with industry regulations
- Manufacturer requirements are met
- Your warranty remains valid (where applicable)
- The work is carried out to recognised standards
Whether your boiler needs servicing, repairing or replacing, choosing the right professional gives you peace of mind that the work is being completed correctly.
How Can I Check an Engineer?
Before booking work, it’s always worth asking which registration the engineer holds.
Registered engineers carry an identification card showing the types of work they’re qualified to undertake.
You can also verify registrations online through the official Gas Safe Register or OFTEC website.
Do I Need My Boiler Serviced Every Year?
Yes.
Whether you have a gas or oil boiler, annual servicing helps:
- Keep your heating system operating efficiently
- Identify potential problems before they become major repairs
- Maintain manufacturer warranties where applicable
- Improve reliability during the colder months
Regular servicing is one of the simplest ways to help extend the life of your boiler.
Why Choose solv?
At solv, our experienced heating engineers work on both gas and oil heating systems, giving homeowners across Northern Ireland access to qualified professionals regardless of the type of boiler they have.
Whether you need a boiler service, repair or replacement, we’ll ensure the work is carried out by an appropriately registered engineer.
Frequently Asked Questions
Is Gas Safe the same as OFTEC?
No. Gas Safe covers engineers working on natural gas and LPG appliances, while OFTEC covers technicians working on oil-fired heating systems.
Can a Gas Safe engineer work on oil boilers?
Not unless they also hold the relevant OFTEC qualifications.
Can an OFTEC engineer work on gas boilers?
Only if they’re also Gas Safe registered for gas work.
Is boiler servicing a legal requirement?
For homeowners, annual servicing isn’t generally a legal requirement, but it’s strongly recommended to protect your warranty, ensure safety, and maintain efficiency. yLandlords have additional legal responsibilities for gas appliances.
How do I know if I have a gas or oil boiler?
If you’re unsure, check your boiler’s documentation or contact your heating provider. Our team can also help identify your system.