Apr. 14, 2025
Are you considering getting a heat pump but concerned about where you'll find the home space? Don't stress because a monobloc heat pump packages all the necessary components to run a heat pump in one compact unit.
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In the article, we'll explore everything you need to know about these renewable heating systems, how they operate, and the price you can expect to pay. We can even help you secure a reliable installer with a good deal for your project.
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Get your best dealQuickly compare 4 FREE quotesA monobloc heat pump is an air to water heat pump made of one unit. This compact system contains all the essential components that make up a fully functional heat pump, including the heat exchanger, evaporator, condenser, compressor, and expansion valve.
: 1 2 3 4 5 : 1 2 3 4From this single outdoor unit, monobloc heat pumps can provide heating, cooling and hot water to your home in the same way as a regular mini split heat pump system, just without the additional indoor unit.
Usually, an indoor unit transfers the heat energy captured by the outdoor unit to your home's central heating system, such as your radiators, air conditioning units, or underfloor heating.
Monobloc heat pumps bypass the need for any indoor components, instead connecting directly to your heating system. Because of this, they should be positioned against the outside wall of your home, as close as possible to the hot water cylinder.
One of the main benefits of monobloc heat pumps is that they save interior home space, making them especially suited to smaller homes.
Given how much power is packed into a monobloc unit, they can be much larger in size than a split system, which is made up of two smaller units. Therefore, you will need to reserve some outdoor home space for the unit itself, and some decent airflow around the unit while it operates to help prevent overheating.
Monobloc heat pumps work in the same way as all air source heat pumps: by absorbing thermal energy from the outside air.
This thermal energy is transferred into a refrigerant via the heat exchanger. The refrigerant is then vaporised via the evaporator, and compressed to increase its temperature and pressure, via the compressor.
The heated refrigerant can then be used to heat up your home's water supply. From here, it can be sent through your home's central heating system and released for heating, cooling, or domestic hot water.
The vapour passes through the expansion valve to reduce the pressure before it's cooled back into a liquid, and the cycle begins again.
: 1 2 3 4 5Both types of air source heat pumps share the same fundamental components, but they differ in how they transfer heat. A split system consists of two separate units connected by pipes that circulate refrigerant between them.
The outdoor unit absorbs heat from the air, while the indoor unit transfers this heat into the home’s heating system. This is also where the compression stage would usually take place.
In contrast, a monobloc unit features a self-contained, closed-circuit refrigerant system and connects directly to the home's water supply, much like a traditional gas boiler.
It's possible to install monobloc ground source heat pumps and even water source heat pumps, although, on a technicality, they can still be considered split since both systems require some additional underground ground loops to extract heat energy.
Ground source heat pumps
Monobloc ground source heat pumps require a connection to a ground loop system which is buried underground. Fluid is pumped through these pipes, absorbing geothermal heat energy as it travels. It will then transport this heat to the outdoor unit, which houses all the components needed to evaporate and condense this heat for your home's needs.
Water source heat pumps
Monobloc water source heat pumps are similar to ground source heat pumps, but instead, they extract heat from a water source like a lake or a river. A mixture of water and antifreeze circulates through coils or heat exchange panels that have been submerged in the water source, absorbing heat energy before being sent to your home via the outdoor unit.
Monobloc air source heat pumps cost an average of £8,000 – £15,000. The average UK home with 3 – 4 bedrooms will require an 8 - 13 kilowatt (kW) heat pump, which will cost £11,500. The table below gives you a closer look at these prices.
Monobloc heat pump costsHousehold size Size Total cost 1 - 2 Bedrooms4 - 6 kW£8, - 4 Bedrooms 8 - 13 kW£11, - 6 Bedrooms8 - 16 kW£15,000This total cost includes the cost of the technology device, the installation costs, and the associated ancillary costs. Estimated costs for high and low-temperature heat pumps, new builds and retrofit installations.
Compared to a split system, monobloc heat pumps are generally cheaper to buy and install since it's far simpler to install one unit than two. That being said, month-to-month energy costs might be higher with a monobloc system because it will require more electricity to power a single-unit heat pump.
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Get your best dealQuickly compare 4 FREE quotesMonobloc heat pump units should be positioned on an outside wall, as close to your hot water cylinder as possible, to allow easy connection between the two.
This positioning is important since it limits the pipework's exposure to outdoor temperatures, which will help prevent water travelling through the pipes from freezing. Anti-freeze may be required to insulate the unit itself, otherwise the water it contains is at risk of freezing.
The entire installation process can be summarised as follows:
Air source heat pump installation: Step-by-stepOnce your monobloc system is installed, you can enjoy some highly efficient renewable heating, reduced energy bills, and the knowledge that you're contributing to a cleaner, greener environment.
Installing a monobloc heat pump for your home can be much simpler than installing a traditional heat pump, thanks to having fewer components to install and connect. Thus, you can expect to pay less in fitting costs.
Another smart way to keep installation costs down is by comparing offers from the best heat pump installers around. This way, you can be sure that you're handing your project over to a qualified professional while benefitting from the best rates.
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Get your best dealQuickly compare 4 FREE quotesA monobloc heat pump is the same as a regular heat pump system, except it operates from one outdoor unit, rather than with an indoor unit.
Monobloc heat pumps are easier and more affordable to install since there are fewer units to install and connect to your heating system. They are also especially advantageous for smaller homes trying to save on home space.
Monobloc heat pumps are just as efficient as regular heat pumps. However, since they are so compact, they generally have a lower heating capacity. This makes them less suitable for larger homes with high heating demands.
Monobloc heat pumps are single unit heat pumps that contain all of the parts; like the heat exchanger, main pump, evaporator, condenser and compression valves in a single system. The single unit normally sits outside of your home.
Monobloc heat pumps are quite large and require outdoor space against an external wall so they can be installed correctly.
Monobloc heat pumps need professional installation but are simpler to install than air conditioning or ground or water source heat pumps.
The monobloc heat pumps outdoor unit will connect directly with your home’s conventional heating systems to provide heat through radiators or underfloor heating from external air.
Here’s What is a heat pump which explains the basics of heat pumps.
The pros and cons of a monobloc heat pump system include;
Some of the benefits of a monobloc heat pump system include;
Here are the disadvantages of monobloc heat pumps;
Monobloc heat pumps only heat water to pump around your central heating system which goes directly to your radiators or underfloor heating.
To get running hot water you will also need to install a separate hot water storage tank. The only element of a monobloc heat pump that will be located within your home is the connected hot water cylinder.
Split heat pumps conversely are different to monobloc heat pumps because they have two separate units. The split system usually has an internal unit and an outdoor unit which works as a heat exchanger and compressor.
Split heat pumps are better for situations where more complex installations are necessary or when there’s no obvious place for a monobloc heat pump unit and they can also be very quiet.
They can be preferable if you only have a small outside space as the outside unit is generally smaller.
Split systems are often referred to as HVACs. Find out more about split HVAC heat pump systems.
Monobloc air source heat pumps include all of their essential parts and equipment within a single unit that can be installed outside your home.
The majority of monobloc air source heat pumps, don’t require traditional gas to work instead they use refrigerants so monobloc heat pumps do not require F gas qualifications (fluorinated gas) to install.
This makes many monobloc heat pump systems cheaper and easier to install than air conditioning units or ventilation systems.
Most monobloc heat pump systems will need to be installed by professional heating installers.
Air source monobloc heat pumps will need external air so the majority of systems are designed as a single outdoor unit that is installed outside the property.
The external unit will need to be installed at ground floor level and somewhere that is easy to access for ongoing maintenance and servicing.
Many people choose to have their heat pump unit situated outside their utility or boiler room is a popular choice because it is easy to connect the heat pump to the heating system.
The outside unit is generally reasonably large due to housing all of the components necessary to get your home’s heating up and running.
Monobloc heat pumps can work well on large properties where you have plenty of outdoor space to house the system and let it operate successfully.
You can get monobloc ground source heat pumps and water source heat pumps. However, they will need to connect to a suitable heat source, through boreholes, aquifers, lakes, rivers or waste heat through a series of pipes.
A monobloc ground source heat pump can still be considered a split system because ground and water source systems require underground or underwater pumps in boreholes to access heat from the ground or a body of water to generate heat.
You will also need an internal hot water tank to store hot water from your heat pump to feed hot water taps in your home.
Most monobloc heat pumps can work effectively in temperatures as low as -25° C. Many heat pumps designed for lower temperatures feature enhanced vapour injection (EVI) technology that helps to maintain the pressures of the refrigerant even at low temperatures.
In a much colder climate, a ground source monobloc heat pump could be a better option as ground temperatures are more stable throughout the year than air temperatures.
Air sealing and insulation, as well as correctly sizing the heat pump for your home are also important considerations.
If you’re replacing a traditional boiler with a heat pump, you shouldn’t have too many changes to make. However, you may wish to;
Improve your home’s insulation; this will help your home retain more heat so your heat pump won’t have to work so hard to keep your home at a comfortable temperature. Many UK homes are currently poorly insulated.
Upgrade your radiators; heat pumps work best when they have a larger surface area to distribute heat. So upgrading your radiators can help your home feel warmer more quickly. Replacing existing radiators with aluminium radiators can also help distribute heat from your heat pump quickly and efficiently as aluminium is an effective conductor.
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