Home Heat Pump Guide

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

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.

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 in heat pumps for the past two decades. It is efficient and non-toxic, but it has a very high global warming potential (GWP) of 2,088 — meaning one kilogram released into the atmosphere has the same warming effect as 2,088 kilograms of carbon dioxide.
  • R32: A newer alternative with a GWP of 675 — about a third of R410A. Many heat pumps sold in the UK since around 2020 use R32. It is mildly flammable (classified as A2L — lower flammability).
  • R134a: Used in some older and larger heat pump 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. This contradiction has driven regulators to act.

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 key elements are:

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. This is measured in CO2-equivalent tonnes, not by weight. The schedule requires:

  • 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

Heat pump systems containing F-gas refrigerant above certain thresholds must have regular leak checks:

  • Systems containing 5 tonnes CO2-equivalent or more: checked at least once every 12 months
  • Systems containing 50 tonnes CO2-equivalent or more: checked every 6 months
  • Systems containing 500 tonnes CO2-equivalent or more: checked every 3 months (or fitted with automatic leak detection)

Most domestic heat pumps fall below the 5-tonne 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. For heat pump installers, this is in addition to their MCS certification. You should always verify that your installer or service engineer holds current F-gas certification before allowing them to work on your system.

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. This makes it essentially climate-neutral from a refrigerant perspective.

Why R290 Is Gaining Ground

  • Extremely low GWP: At just 3, R290 is future-proof against any conceivable 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 not a synthetic chemical — it 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. Manufacturers can use as much as they need without regulatory limits.

R290 Safety Considerations

The main concern with R290 is that it is flammable. Propane is, after all, the same substance used in camping gas cylinders and barbecues. However, the quantities used in domestic heat pumps are very small — typically less than one kilogram — and modern R290 heat pumps are designed with extensive safety features:

  • Sealed outdoor unit: All the refrigerant is contained in the outdoor unit, with only water circuits entering the building. This means there is no flammable refrigerant inside your home.
  • Leak detection sensors: Built-in gas sensors that shut the system down and trigger ventilation if a leak is detected
  • Minimum placement distances: R290 units must be installed a minimum distance from doors, windows, openable ventilation, and ignition sources. Your installer will ensure these distances are met.
  • Compliance with standards: R290 heat pumps sold in the UK comply with EN 378 safety standards for refrigeration systems

In practice, the safety risk to homeowners is negligible. Millions of R290 heat pumps are now installed across Europe, and the safety record is excellent.

What This Means for Homeowners

If You Are Buying a New Heat Pump

The shift to R290 is well underway. Most major manufacturers — including those popular in the UK market — now offer R290 models, and some have discontinued their R410A ranges entirely. When choosing a new heat pump:

  • R290 is the safest long-term choice: It is completely unaffected by F-gas regulations and will remain available and affordable for the entire lifespan of your heat pump.
  • R32 is still a reasonable option: With a GWP of 675, R32 is significantly better than R410A and is widely available. However, it is still an F-gas and could face further restrictions in the future.
  • Avoid R410A for new installations: While not yet banned, R410A is being phased out and servicing costs will increase as supply becomes more restricted.

If You Have an Existing R410A or R32 System

If your current heat pump uses R410A or R32, there is no need to panic or rush to replace it. Your system will continue to work normally, and refrigerant for servicing and repairs will remain available — albeit at increasing cost — for many years to come. The phase-down is gradual, not a sudden ban.

However, be aware that:

  • The cost of R410A refrigerant has already increased and will continue to rise as supply is restricted
  • If your system develops a refrigerant leak, the cost of repair will be higher than it would be for an R290 system
  • When the time comes to replace your heat pump, the new unit will almost certainly use R290 or another low-GWP refrigerant

Impact on Installation Costs

R290 heat pumps are generally competitively priced with R32 models. In some cases, they are actually less expensive because the refrigerant itself costs less and the charge quantity is smaller. However, installation requirements are slightly different due to the flammability classification:

  • Placement restrictions may affect where the outdoor unit can be positioned
  • Installers need specific R290 training in addition to standard F-gas certification
  • Electrical connections in the vicinity of the unit may need to meet additional standards

These requirements are well-established and should not significantly affect overall installation costs.

Impact on Servicing

The type of refrigerant in your heat pump affects servicing in several ways:

  • Engineer qualifications: All refrigerant types require F-gas certification. R290 additionally requires specific training in handling flammable refrigerants. When booking a service, confirm that the engineer is certified for your specific refrigerant type.
  • Refrigerant cost: If a top-up or recharge is needed, R290 is substantially cheaper than R410A or R32. This makes leak repairs less expensive overall.
  • Recovery requirements: When a heat pump is decommissioned, all F-gas refrigerant must be recovered by a certified engineer and disposed of properly. This is a legal requirement. R290 also needs to be recovered, but the process is simpler.

The Broader Environmental Picture

The move to natural refrigerants addresses one of the legitimate criticisms of heat pumps. While a heat pump dramatically reduces carbon emissions from heating by using renewable electricity, a system using R410A still contains a potent greenhouse gas. A single R410A heat pump with a typical charge of 2 to 3 kilograms of refrigerant contains the CO2-equivalent of roughly 4,000 to 6,000 kilograms of carbon dioxide.

With R290, that figure drops to just 6 to 9 kilograms of CO2-equivalent — effectively negligible. This means the environmental case for heat pumps becomes even stronger as the market transitions to natural refrigerants.

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

Reclaimed and Recycled Refrigerant

As high-GWP refrigerants become scarcer and more expensive, the market for reclaimed and recycled refrigerant is growing. When old systems are decommissioned, the recovered refrigerant can be cleaned, tested, and re-certified for use in other systems. This provides an additional supply source for servicing existing R410A and R32 systems.

Using reclaimed refrigerant is perfectly legitimate and does not affect system performance, provided it meets the required purity standards. Your service engineer can advise on this option if you need a refrigerant recharge.

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 including gas leak detection and automatic shutdown. 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 regarding F-gas regulations. 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 by a certified engineer.

Will F-gas regulations make heat pumps more expensive?

The transition to R290 is not expected to increase heat pump prices. R290 as a substance is cheaper than synthetic F-gases, and the manufacturing processes are well-established. If anything, the removal of reliance on quota-restricted F-gases should provide long-term price stability.

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. When the time comes to replace your heat pump, the new unit will use the appropriate modern refrigerant.

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, meaning one kilogram equals just 3 kilograms of CO2 — essentially negligible.