Gas FAQs

What is the Gas Safe Register?

Gas Safe is the only official gas registration body of gas businesses and engineers in the United Kingdom, Isle of Man and Guernsey. By law, all gas businesses must be on the Gas Safe register.

A gas engineer can only be aligned to a registered business and be issued with a licence to undertake gas work on behalf of a registered business if they hold a valid and current qualification.

Registration is only given on the basis of the business having at least one gas safety qualified engineer.

The register is not a membership body or trade association.

The register (and all services associated with it) is operated on behalf of the relevant health and safety authority for each region in which it operates, i.e. Great Britain, Northern Island, Isle of Man and Guernsey.

Gas Safe register replaced CORGI as the only gas registration body in Great Britain and the Isle of Man on 1st April 2009 and in Northern Island and Guernsey on 1st April 2010.


How do I know if a company or engineer is gas qualified?

You can check any business or engineer by going onto and entering the company’s or individual’s registration number. Each Gas Safe engineer is issued an identification card with their qualifications on and this should always be shown to prove competence when carrying out any gas works. 


What should I do if I smell gas?

If you think you have a gas leak or can smell gas, leave the house and phone the national gas emergencies number immediately on 0800 111 999. If you’re at home, and you can do it safely, turn off your gas supply at the ECV (Emergency Control Valve). The Emergency Control Valve should be next to your gas meter.


Do I need my boiler serviced annually?

Homeowners: It is not a legal requirement for homeowners who DO NOT rent out their property to have an annual boiler service. However, they have a duty of care to ensure that all their gas appliances are safe, and not liable to cause harm to themselves or others.  An annual service will also keep a boilers warranty valid. Failure to do so will potentially validate any warranty existing on the boiler in the property.

Landlords: It is a legal requirement for landlords to have their gas appliances and flues serviced on an annual basis under the Landlord and Tenant Act 1985. You can complain to the health and safety executive (HSE) if your landlord will not carry out an annual gas safety check.  The HSE can prosecute landlords who don’t meet their gas safety responsibilities.


How long does a gas service/Landlord Gas Safety Check take?

There are many factors that can effect the length of a gas service or landlord gas safety check. In general, a boiler service will take between 30-60 minutes, but this can be longer depending on whether additional gas appliances in the property require servicing.


What is not included in a Gas Service?

The cost of replacing any parts or faults not involved in a gas service. If any parts are required or faults identified, we will repair this at an additional cost with your permission. 


How often do I need to top up my boiler pressure?

When the heating system is cool, the system pressure should be between 1 and 1.5 bar on your boilers pressure gauge. If the system pressure drops below 0.5 bar, this would indicate that there is a potential leak on the system or radiators have been vented. The system will need re-pressurising via the systems filling link. If you are unsure on how to re-fill your heating system, it is advised that you contact an engineer to do this for you. 


Can I put too much pressure in my boiler?

Yes. Over-pressurising the boiler can cause damage to the appliance and system in general. Boilers can also over-pressurise in use due to faulty components. If you’re boiler pressure is over-pressurised, you can reduce this by venting/bleeding radiators. Alternatively if this is not possible, it is recommended that you contact an engineer to do this for you safely. 


What is a Thermostatic Radiator Valve (TRV)?

TRV’s allow you to control the temperature of each room individually, thus helping to improve comfort in your home as well as saving money and energy. Most radiators will be fitted with these. Ideally, TRV’s should be well exposed and not obstructed by any curtains or blocked by furniture.


How often should I replace by boiler?

The general lifespan of a boiler is around 10-15 years. Whilst this is an average, your boiler may last longer if you take care of it. Alternatively, failure to maintain your boiler could result in a reduced lifespan. You should decide to replace your boiler when repairs become too expensive or start mounting up. Opting for a new boiler at this point should save you money in the long run. One of our expert engineers should be able to help you decide on the correct time to replace your boiler.


What different types of boilers are available?

There are a few different types of modern boilers on the market, and deciding between them can be difficult.

The boiler you are most likely to have installed is a combi boiler. As the name suggests, these boilers combine a water heater and central heating system in one package. This means you don’t need an external water tank.

A system boiler does require an external tank. However this only stores hot water and all of the heating is carried out by the boiler itself.

The third type of boiler you might come across is a standard boiler. These boilers need hot and cold water tanks and are usually more suited to older homes with existing heating and storage systems. 

Will I receive anything in writing when I have a new boiler installed?

Your local authority must be told when you have a new or replacement boiler fitted. Your installer should do this for you, and you should receive the following certificate:

If your boiler is installed by a Gas safe registered/CORGI-registered or OFTEC registered installer, you will get a “building regulations compliance” certificate from Gas Safe Register/CORGI or OFTEC after the work has been completed. Gas Safe Register/CORGI or OFTEC will also tell the local authority that you have had a new or replacement boiler fitted. You should keep this certificate as you may need it when you sell your home.


What is boiler Plus?

Boiler Plus is a set of standards that were implemented in April 2018 to improve the way people use energy in their homes by giving them a greater choice on how to maximise energy efficiency.

These standards provide households with a level of choice over how energy efficient measures are implemented in their homes.

This set of regulations comes with 3 key requirements:

    1. All gas boilers installed into existing systems in England to have an ERP efficiency of at least 92%
    2. All gas and oil boilers require time and temperature controls to be installed at the same time, if not already present and working.
    3. Combination boiler replacements to include the provision of an additional energy efficiency measure to be installed at the same time
    • Flue gas heat recovery
    • Weather compensation
    • Load compensation
    • Smart controls with automation and optimisation functions.
Have further questions? Get in touch and we will answer them.