Industrial heat is traditionally generated using fossil-fuel boilers and other combustion-based systems. As industries seek to reduce energy consumption and carbon emissions, high-temperature heat pumps are emerging as an efficient alternative for the electrification and decarbonization of industrial heat.
Unlike conventional heat pumps, high-temperature industrial heat pumps can upgrade low-grade heat from sources such as industrial waste heat, process water, geothermal energy or other available heat streams and deliver it at temperatures suitable for industrial processes.
Their main advantage is efficiency: rather than converting electricity directly into heat, a heat pump uses electricity to transfer and upgrade thermal energy that is already available.
This makes high-temperature heat pumps particularly relevant for industries that require large amounts of process heat while also having access to recoverable low-temperature heat.
What is a high-temperature heat pump?
A high-temperature heat pump (HTHP) is an industrial heat pump designed to transfer heat from a lower-temperature source to a higher-temperature sink and deliver useful heat at temperatures above those typically provided by conventional heat pumps.
High-temperature heat pumps commonly provide heat in the range of approximately 80°C to 120°C, although the achievable supply temperature depends on the technology, refrigerant, compressor configuration, heat source and required temperature lift.
Very-high-temperature heat pump technologies are extending this operating range further, opening the possibility of electrifying industrial processes that have traditionally depended on steam or fossil-fuel boilers.
A high-temperature heat pump can therefore take thermal energy that would otherwise have little practical value —such as industrial waste heat— and upgrade it to a temperature at which it can be reused in an industrial process or heating network.
High-temperature heat pumps at a glance
| Parameter | High-temperature industrial heat pumps |
|---|---|
| Main function | Upgrade low-temperature heat into useful high-temperature heat |
| Typical heat sources | Industrial waste heat, process water, geothermal energy, seawater and other thermal sources |
| Typical applications | Process heating, drying, washing, pasteurization, hot water and district heating |
| Typical supply temperatures | Approximately 80–120°C, depending on technology |
| Higher-temperature applications | Possible with very-high-temperature heat pump technologies |
| Main efficiency metric | Coefficient of Performance (COP) |
| Key opportunity | Industrial heat electrification and waste heat recovery |
| Main advantage | Multiple units of useful heat can be delivered per unit of electricity consumed |
How do high-temperature heat pumps work?
High-temperature heat pumps operate according to the same fundamental principle as conventional heat pumps: they move thermal energy from a lower temperature level to a higher one through a refrigeration cycle.
The process involves four main components:
1. Evaporator
The evaporator absorbs thermal energy from the available heat source.
Depending on the project, this source could be industrial waste heat, process water, seawater, geothermal energy or another low-grade thermal source.
The refrigerant absorbs this energy and evaporates.
2. Compressor
The refrigerant vapor enters the compressor, where its pressure and temperature are increased.
The compressor is one of the most important elements determining the operating range, capacity and efficiency of an industrial heat pump.
Depending on the application, technologies can include high-pressure screw compressors or oil-free centrifugal compressors with magnetic bearings.
3. Condenser
The high-pressure, high-temperature refrigerant enters the condenser and releases its thermal energy to the process or heating network.
As the refrigerant transfers its heat, it condenses back into liquid.
4. Expansion valve
Finally, the expansion valve reduces the refrigerant pressure and temperature so that it can return to the evaporator and begin the cycle again.
The result is a continuous process that takes heat available at a lower temperature and upgrades it to a useful temperature level.
Additionally, high temperature heat pumps use other advanced technologies such as oil free, magnetic bearing centrifugal compressor or oil flooded high pressure screw compressors, heat exchangers and refrigerants, all able to withstand high critical temperatures to achieve high pressure differentials.
What is COP and why is it important for industrial heat pumps?
The Coefficient of Performance (COP) measures the relationship between the useful heat delivered by a heat pump and the electricity required to operate it.
For example, a COP of 4 means that:1 MW of electrical input → 4 MW of useful thermal output
The additional thermal energy is not created by the heat pump. It comes from the heat source.
This is one of the fundamental differences between a heat pump and direct electric resistance heating.
The COP achieved by an industrial heat pump depends heavily on project conditions, particularly:
- Heat source temperature
- Required supply temperature
- Temperature lift
- Refrigerant
- Compressor technology
- Part-load operation
- Overall system design
In general, the smaller the temperature lift between the heat source and the required heat output, the greater the potential for high heat pump efficiency.
This is why identifying the right heat source is critical when designing a high-temperature heat pump project.
What heat sources can industrial heat pumps use?
One of the main advantages of industrial heat pumps is their ability to recover thermal energy from multiple sources.
Industrial waste heat
Industrial processes frequently reject large quantities of heat through cooling systems, cooling towers, process water or other thermal streams. Instead of rejecting this heat to the environment, a heat pump can increase its temperature and make it useful again.
Waste heat recovery can therefore reduce both the amount of primary energy required to produce heat and the energy or water associated with rejecting excess heat.
Process water
Warm process water can provide a stable heat source, particularly in facilities where industrial activity generates continuous thermal loads. The stability and temperature of the source are important because they directly influence heat pump performance.
Seawater and other water sources
Large-scale heat pumps can also extract thermal energy from seawater, lakes, rivers or other suitable water sources. These sources can be particularly valuable for district heating and industrial installations located close to large bodies of water.
Geothermal and renewable heat sources
Geothermal energy and other renewable thermal sources can also be upgraded using heat pumps to provide higher-temperature useful heat.
The best heat source is not necessarily the one with the highest theoretical energy potential. Temperature, availability, distance, variability and simultaneity between heat supply and demand must all be considered.
Why are high-temperature heat pumps important for industrial decarbonization?
Industrial heat is one of the most challenging areas to decarbonize because many production processes require large and continuous amounts of thermal energy.
Traditionally, this demand has been met using natural gas, coal, oil or other fuels. High-temperature heat pumps offer an alternative by combining industrial heat electrification with heat recovery.
Instead of producing all the required thermal energy from a fuel, the heat pump can recover energy already available within or near the industrial facility and use electricity to upgrade it.
When the electricity used by the heat pump has a low carbon intensity, the potential emissions reduction becomes even greater.
What are the benefits of high-temperature heat pumps?
The business case for an industrial heat pump goes beyond replacing one heating technology with another.
High energy efficiency
Because heat pumps transfer existing thermal energy rather than producing heat exclusively from electricity, they can deliver multiple units of useful heat for each unit of electricity consumed.
The actual COP must always be calculated for the specific operating conditions.
Industrial waste heat recovery
Heat that would otherwise be rejected through cooling towers or other heat rejection systems can potentially become a useful energy source.
This can transform waste heat from a liability into an energy resource.
Reduced fossil fuel consumption
Heat pumps can replace or complement boilers and other combustion-based heating technologies for processes within their operating temperature range.
This reduces the facility's dependence on fossil fuels.
Lower carbon emissions
Electrification combined with heat recovery can significantly reduce emissions associated with industrial heat production, particularly when the electricity supply has a low carbon intensity.
Integration with renewable energy
Heat pumps can use electricity from renewable sources while also recovering renewable or waste thermal energy. This allows greater integration between electricity and thermal energy systems.
Simultaneous heating and cooling opportunities
Some industrial facilities require cooling in one process while requiring heat elsewhere.
A properly designed heat pump system can connect both requirements, recovering energy from the cooling side and delivering it to the heating side. This can substantially improve the overall energy efficiency of the facility.
The future of high-temperature heat pumps in industry
As industrial decarbonization accelerates, heat pumps are moving beyond traditional building heating applications and becoming an increasingly relevant technology for large-scale industrial energy systems.
Developments in compressors, refrigerants and system design continue to extend achievable temperature ranges and capacities. At the same time, the growing focus on waste heat recovery creates an important opportunity.
Industrial facilities frequently consume energy to remove heat from one part of the process while simultaneously consuming fuel to generate heat somewhere else.
High-temperature heat pumps can connect these two requirements. Rather than considering heating and cooling as separate energy systems, industrial operators can increasingly evaluate them as part of the same thermal energy strategy.
For this reason, the most successful industrial heat pump projects begin not with the selection of a specific machine, but with a detailed analysis of where heat is available, where it is required and at what temperature levels.
Want to learn more about high temperature heat pumps and their potential for revolutionizing and decarbonizing the industry?
At Araner, we can help you. Download our free technical ebook about heat pumps or get in touch with us to speak directly to our team.
Frequently asked questions about high-temperature heat pumps
What temperature can an industrial heat pump reach?
High-temperature heat pumps commonly supply heat at approximately 80–120°C, although achievable temperatures depend on the refrigerant, compressor technology and system configuration. Very-high-temperature heat pump technologies can reach higher temperature levels.
What is the COP of a high-temperature heat pump?
COP varies according to operating conditions. A COP of 4 means that the system provides 4 units of useful thermal energy for every unit of electricity consumed.
Can heat pumps recover industrial waste heat?
Yes. Industrial waste heat is one of the most valuable heat sources for high-temperature heat pumps because thermal energy that would otherwise be rejected can be upgraded and reused.
Can high-temperature heat pumps replace gas boilers?
They can replace gas boilers in suitable applications where the required temperature, heat source and operating conditions allow it. Hybrid configurations can also reduce boiler consumption when full replacement is not feasible.
Why does temperature lift matter for heat pump efficiency?
The greater the difference between the heat source temperature and the required output temperature, the more work the compressor must perform. Lower temperature lifts generally result in higher efficiency.
Can industrial heat pumps be combined with Thermal Energy Storage?
Yes. TES can store heat produced by the heat pump and make it available later, helping decouple heat production from demand and increasing system flexibility.
Are high-temperature heat pumps suitable for district heating?
Yes. Large-scale heat pumps can upgrade industrial waste heat, seawater and other low-temperature sources to temperatures suitable for district heating networks.
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