Heat pump underfloor heating: The facts for UK homes
If you’re planning a new heating system, heat pump underfloor heating might already be on your radar. It sounds efficient, modern, and space-saving, but is it the right choice for your home?
In many cases, yes. Heat pumps and underfloor heating can work very well together, especially when the underfloor heating is water-based rather than electric. The key is getting the system designed properly for your property.
Heat pumps work best when they provide steady warmth at lower temperatures. Underfloor heating supports this because it spreads heat evenly across the floor. It warms the room gently. It doesn't rely on short bursts of high heat.
The result can be a home that feels consistently warm while helping your heat pump run efficiently.
At SGS Energy, we help homeowners see if underfloor heating with a heat pump suits their home, budget, and daily life.
In this guide, we’ll explain how heat pump underfloor heating works, where it performs best, and what to think about before installing it.
Continue reading to learn more.
Why heat pump underfloor heating works so well
The main reason heat pump underfloor heating works so well comes down to temperature.
Traditional boilers often heat water to high temperatures before sending it around a radiator system. In contrast, heat pumps work best when they can heat water to lower temperatures over a longer period.
Underfloor heating suits this style of heating because the whole floor acts as a heat emitter. So, instead of using smaller radiator panels, the system uses a much larger surface to warm the room evenly.
That can bring several benefits:
- More even warmth across the room
- Lower flow temperatures
- Better heat pump efficiency
- Less reliance on visible radiators
- A cosy feeling underfoot
- More usable wall space
How air source heat pumps with underfloor heating work
An air source heat pump extracts heat from the outside air and transfers it into water for your heating system. That warm water then flows through pipes under the floor, where it releases heat and slowly warms the room above.
The system usually works like this:
- The heat pump extracts heat energy from outside the property
- It raises that heat to a usable temperature
- Warm water flows through the underfloor heating pipes
- Heat is released evenly across the floor surface
- Controls manage temperatures across different zones
This setup isn't like a traditional boiler system that heats water to higher temperatures and turns on and off all day. By comparison, a heat pump underfloor system runs continuously to keep indoor temperatures stable.
Wet vs electric underfloor heating
This is one of the most important points to understand. When people talk about heat pumps and underfloor heating, they usually mean wet underfloor heating:
Wet underfloor heating
As we've already hinted at, wet underfloor heating uses pipes filled with warm water. These pipes are connected to a heat source, such as a heat pump or boiler. This is the type of underfloor heating that usually pairs best with a heat pump.
Electric underfloor heating
Electric underfloor heating uses cables or mats beneath the floor that are powered directly by electricity. You can still use these systems in a home with a heat pump. But, installers don’t usually connect them like a wet system.
Instead, they run on mains electricity, not heated water. So, they don’t boast the same efficiency as a heat pump system.
Energy Saving Trust notes that electric underfloor heating is often cheaper to install. However, it often costs more to run than a wet system. This is especially true in larger areas of the home.
For that reason, electric underfloor heating is best for small spaces, like bathrooms. Wet underfloor heating is more common for whole-home heating with a heat pump.
Why flow temperature matters
Flow temperature refers to how hot the water is as it moves through your heating system.
Heat pumps perform best when they can operate at lower temperatures. Underfloor heating supports this by using a larger surface area to warm a room, so it doesn’t need water to be as hot as a traditional radiator system.
This alignment is what makes underfloor heating a strong partner for a heat pump when the system is designed correctly.
Is underfloor heating better than radiators with a heat pump?
Although underfloor heating is a strong match for a heat pump, radiators can also work well when they're correctly sized.
This is because a heat pump still relies on heat emitters to warm each room. Underfloor heating uses a large surface area to do this at lower temperatures, while radiators need to be larger to deliver the same level of heat without increasing the flow temperature.
In many homes, this leads to a mixed approach. Underfloor heating is often installed on the ground floor, where there's more space and easier access during renovations, while larger radiators are used upstairs.
Energy Saving Trust notes that this type of setup is common, provided the radiators are sized correctly so they can emit enough heat at lower flow temperatures.
A typical system might include:
- Underfloor heating in open-plan living areas
- Larger or upgraded radiators in bedrooms
- Smart heating controls
- Zoned temperature settings
- A hot water cylinder or an alternative hot water solution
The right design depends on your property, insulation levels, floor construction, and how heat is distributed throughout the home.
Can you retrofit underfloor heating with a heat pump?
Yes, but the level of work depends on your home.
Retrofitting underfloor heating is usually easiest during:
- Renovations
- Extensions
- Kitchen upgrades
- Ground floor refurbishments
- New flooring projects
It can be more disruptive if finished floors need to be lifted. For that reason, many homeowners choose to install underfloor heating in selected areas rather than across the whole property.
For that reason, if you’re installing underfloor heating now but may add a heat pump later, it’s worth planning ahead. Using larger pipes and placing them closer together allows the system to deliver enough heat at lower water temperatures, which is how heat pumps operate most efficiently. Adding good insulation beneath the pipes also helps direct heat upwards into the room rather than losing it into the floor below, improving overall performance.
Are heat pumps and underfloor heating suitable for older homes?
Yes, they can be suitable for older homes, but design matters.
Older properties often lose more heat through walls, floors, roofs, windows, and doors. That doesn’t rule out a heat pump, but it does mean the system needs to be designed around how the home actually performs.
The first step is a heat loss report. This is a room-by-room assessment that calculates how much heat each space loses and how much heat is needed to keep it warm. It provides a clear picture of the system size and heat output required, rather than relying on estimates.
Without this, there’s a risk of installing a system that can’t keep up in colder weather or one that runs inefficiently.
From there, the installer uses this information to design how heat will be delivered throughout the home, taking into account:
- Insulation levels
- Room-by-room heat demand
- Floor construction
- Pipe spacing
- Floor coverings
- Existing heating system
- Hot water requirements
- Available outdoor space for the heat pump
- Controls and zoning
What floor coverings work best with heat pump underfloor heating?
Some materials transfer heat more easily than others. Tile, stone, and some engineered wood floors are often well-suited to underfloor heating. Carpet can work too, but the tog rating of the carpet and underlay matters. A combined tog rating of 2.5 or lower is generally recommended to allow heat to move more efficiently into the room.
Pro Tip: Before choosing flooring, ask your installer or flooring supplier whether it's suitable for underfloor heating and heat pump flow temperatures.
Common myths about heat pumps and underfloor heating
Myth 1: You must have underfloor heating to install a heat pump
This is false. When sized correctly, air source heat pumps can work with radiators. Some homes use underfloor heating in some rooms and radiators in others.
Myth 2: Heat pumps don’t work in cold weather
Modern heat pumps can work effectively in cold and even freezing conditions. This is because heat energy remains in the air, even at low temperatures, and the heat pump can extract it and use it to warm your home.
Myth 3: Heat pump underfloor heating heats a room instantly
Underfloor heating is designed for steady, even warmth. That said, it usually takes longer to warm up than a radiator. But it can create a more consistent indoor temperature when properly controlled.
Is heat pump underfloor heating right for your home?
In summary, heat pump underfloor heating may be a good fit if:
- You're renovating or replacing floors
- You're building an extension
- You want to reduce reliance on fossil fuel heating
- You want fewer visible radiators
- Your home has good insulation, or can be upgraded
- You want steady, even heat
- You're planning a long-term heating upgrade
It may need more planning if:
- Your home has high heat loss
- Floors can't be lifted easily
- You have thick carpet throughout
The best way to find out is through a proper home assessment. At SGS Energy, we can assess your property and hot water requirements before recommending the right system. That means you get practical advice based on your home, not generic guidance.
Thinking about an air source heat pump with underfloor heating? Contact SGS Energy today to discuss your options.
FAQs
Does heat pump underfloor heating work in winter?
Yes. A correctly designed heat pump and underfloor heating system should keep your home warm in winter. Heat loss, insulation, flow temperature, and controls all affect performance.
Are underfloor heating heat pumps a special type of heat pump?
No. People sometimes use the phrase underfloor heating heat pumps to describe heat pumps connected to wet underfloor heating. The heat pump itself may be an air source, ground source, or water source system.
Will heat pump underfloor heating save money?
It can, but savings depend on your current heating system, electricity tariff, insulation, floor type, and the system's design. A tailored assessment is the best starting point.
