Heat Pump F-Gas Regulations UK: What Homeowners Need to Know

The refrigerant inside your heat pump could have a global warming impact 2,000 times greater than CO2 — or almost none at all, depending on the type. UK F-gas regulations are rapidly reshaping which refrigerants are available, what servicing costs, and which heat pumps represent the smartest long-term investment.

If you are researching heat pumps, you will increasingly come across terms like F-gas, R410A, R32, and R290. These relate to the refrigerant — the fluid that circulates inside the heat pump and makes the whole system work. UK regulations on these substances are tightening significantly, and this is reshaping the heat pump market in ways that directly affect homeowners.

This guide explains what F-gas regulations mean in plain language, why the industry is moving towards natural refrigerants like R290, and what this shift means for your heat pump purchase, servicing, and long-term costs. If you are planning an installation, understanding refrigerant choices helps you make a better decision.

What Are F-Gases?

F-gases (fluorinated gases) are a family of synthetic chemicals used as refrigerants in heat pumps, air conditioning systems, and refrigeration equipment. The most common F-gases used in heat pumps are:

• R410A: The dominant refrigerant for the past two decades. Efficient and non-toxic, but with a very high global warming potential (GWP) of 2,088.
• R32: A newer alternative with a GWP of 675 — about a third of R410A. Many heat pumps sold since around 2020 use R32.
• R134a: Used in some older and larger systems, with a GWP of 1,430.

The problem with F-gases is their extreme global warming potential. While heat pumps themselves are excellent for reducing carbon emissions from heating, a refrigerant leak from an R410A system releases a potent greenhouse gas.

UK F-Gas Regulations: The Current Rules

Following Brexit, the UK established its own F-gas regulations separate from the EU, though the trajectory is similar.

The Phase-Down Schedule

The UK F-gas phase-down progressively reduces the total quantity of high-GWP F-gases that can be placed on the market:

• By 2027: F-gas supplies reduced to 45 percent of the 2015 baseline
• By 2030: Reduced to 24 percent of baseline
• By 2036: Reduced to just 15 percent of baseline

This does not mean high-GWP refrigerants are banned outright — yet. But as supply is restricted, prices increase dramatically, and manufacturers are compelled to switch to lower-GWP alternatives.

Leak Checking Requirements

Most domestic heat pumps fall below the 5-tonne CO2-equivalent threshold and are therefore exempt from mandatory leak checking requirements. However, checking for leaks as part of an annual service is still strongly recommended.

Engineer Certification

Anyone who installs, services, maintains, or decommissions equipment containing F-gases must hold a valid F-gas handling certificate. This is in addition to MCS certification for installers.

The Shift to R290 (Propane)

The most significant change in the heat pump market is the rapid adoption of R290 (propane) as a refrigerant. R290 is a natural refrigerant with a GWP of just 3 — compared to 2,088 for R410A and 675 for R32.

Why R290 Is Gaining Ground

• Extremely low GWP: At just 3, R290 is future-proof against any tightening of F-gas regulations
• Excellent thermodynamic properties: R290 is actually a very efficient refrigerant, often delivering equal or better COP than R410A
• Widely available and inexpensive: Propane is readily available and costs far less than manufactured refrigerants
• No supply restrictions: Because it has a GWP below 5, R290 is not subject to the F-gas phase-down quota

R290 Safety Considerations

The main concern with R290 is that it is flammable. However, the quantities used in domestic heat pumps are very small — typically less than one kilogram — and modern R290 heat pumps include extensive safety features:

• Sealed outdoor unit: All the refrigerant is contained in the outdoor unit, with only water circuits entering the building
• Leak detection sensors: Built-in gas sensors that shut the system down if a leak is detected
• Minimum placement distances: R290 units must be installed a minimum distance from doors, windows, and ignition sources
• Compliance with standards: R290 heat pumps comply with EN 378 safety standards

What This Means for Homeowners

If You Are Buying a New Heat Pump

• R290 is the safest long-term choice: Completely unaffected by F-gas regulations, and will remain affordable for the entire lifespan of your heat pump
• R32 is still reasonable: With a GWP of 675, R32 is significantly better than R410A, though it could face further restrictions
• Avoid R410A for new installations: Being phased out and servicing costs will only increase

When comparing heat pump costs, consider the long-term servicing implications of the refrigerant type, not just the upfront price.

If You Have an Existing R410A or R32 System

There is no need to panic or rush to replace it. Your system will continue to work normally, and refrigerant for servicing will remain available — albeit at increasing cost. When the time comes to replace your heat pump, the new unit will almost certainly use R290.

Impact on Servicing

• Engineer qualifications: All refrigerant types require F-gas certification. R290 additionally requires specific flammable refrigerant training.
• Refrigerant cost: If a recharge is needed, R290 is substantially cheaper than R410A or R32
• Recovery requirements: When a heat pump is decommissioned, all F-gas refrigerant must be recovered by a certified engineer

The Broader Environmental Picture

The move to natural refrigerants addresses one of the legitimate criticisms of heat pumps. With R290, the environmental case for heat pumps becomes even stronger. A heat pump running on solar-generated electricity with R290 refrigerant achieves near-zero carbon heating — a combination that represents the gold standard for UK home energy.

The UK government views the F-gas phase-down as complementary to its heat pump deployment targets. By ensuring heat pumps use climate-friendly refrigerants, the net carbon savings from the transition away from gas boilers are maximised.

Frequently Asked Questions

Will my R410A heat pump be banned?

No. Existing installations are not affected by the phase-down. Your system can continue operating for its full lifespan. The phase-down restricts the supply of new R410A refrigerant, which means servicing costs may increase over time, but the substance will remain available through reclaimed and recycled sources.

Is R290 safe for domestic use?

Yes. R290 heat pumps are designed with the refrigerant entirely contained in the outdoor unit, sealed from the living space. The quantities are small (typically under one kilogram), and modern units include multiple safety features. Millions have been installed across Europe with an excellent safety record.

Do I need to do anything about F-gas regulations?

As a homeowner, you do not need to take any direct action. Your responsibilities are simply to ensure that anyone who works on your heat pump's refrigerant circuit holds valid F-gas certification, and that if your system is decommissioned, the refrigerant is properly recovered.

Will F-gas regulations make heat pumps more expensive?

The transition to R290 is not expected to increase prices. R290 is cheaper than synthetic F-gases, and the manufacturing processes are well-established.

Can I switch my existing heat pump from R410A to R290?

No. You cannot change the refrigerant type in an existing system. Heat pumps are designed, tested, and certified for a specific refrigerant. Using a different refrigerant would be dangerous, illegal, and would destroy the equipment.

What does GWP mean in practice?

Global Warming Potential (GWP) measures how much heat a greenhouse gas traps in the atmosphere over 100 years, compared to carbon dioxide (which has a GWP of 1). R410A has a GWP of 2,088, meaning one kilogram released equals 2,088 kilograms of CO2. R290 has a GWP of 3 — essentially negligible.