A heat pump is a device that moves heat from one place to another rather than generating it by burning fuel. It uses a small amount of electricity to extract thermal energy from air, water, or the ground and deliver it at a higher temperature where it is needed. Because it transfers existing heat rather than creating it from scratch, a heat pump can deliver more energy than it consumes, making it one of the most efficient options for low-temperature heating applications.
Relying on heat pumps for industrial heating is holding back your decarbonisation progress
Heat pumps work well for space heating and domestic hot water, but industrial processes often require temperatures well above what heat pumps can reliably deliver. When a sustainability manager builds a decarbonisation roadmap around heat pump technology for high-temperature applications, the plan tends to stall at the engineering stage. The result is delayed emissions reductions, missed internal targets, and an uncomfortable conversation with leadership about why the transition is taking longer than expected. The fix is to match the technology to the temperature requirement. For processes above roughly 150°C, it is worth evaluating alternatives alongside heat pumps rather than defaulting to them.
Assuming electrification solves all industrial heat is costing companies time and money
The assumption that renewable electricity plus heat pumps or electric resistance heating can cover all industrial decarbonisation needs is widespread, and it leads to expensive surprises. Grid connection upgrades, limited local electricity capacity, and the high cost of electrical heating at scale can make full electrification impractical for energy-intensive sites. Companies that commit to this path early often find themselves years into a project before the infrastructure constraints become clear. A more productive starting point is a site-level energy audit that maps temperature requirements, grid capacity, and total cost of ownership before selecting any technology.
What is a heat pump and how does it work?
A heat pump works by compressing a refrigerant to raise its temperature, then using that heat where it is needed. It extracts thermal energy from a low-temperature source such as outdoor air, groundwater, or soil and delivers it at a higher temperature to a building or process. Because it moves heat rather than burning fuel, it produces no direct combustion emissions.
The core mechanism relies on the refrigeration cycle running in reverse. The refrigerant absorbs heat from the source, evaporates, is compressed to a higher pressure and temperature, then releases that heat at the delivery point before expanding and starting the cycle again.
The efficiency of a heat pump is expressed as its Coefficient of Performance (COP). A COP of 3 means the pump delivers three units of heat for every one unit of electricity consumed. This ratio makes heat pumps considerably more efficient than direct electric resistance heating, which delivers one unit of heat per unit of electricity.
How does a heat pump use renewable energy?
A heat pump uses renewable energy in two ways. First, the electricity that drives the compressor can come from renewable sources such as wind or solar, making the process free of fossil fuel consumption. Second, the ambient heat extracted from air, ground, or water is itself a form of stored solar energy, meaning the majority of the energy delivered is renewable by nature.
When powered by green electricity, a heat pump’s full operating cycle produces no direct carbon emissions. The environmental benefit depends heavily on the carbon intensity of the electricity grid supplying the compressor. In countries with high shares of renewable power generation, heat pumps deliver strong emissions reductions. In grids still dominated by coal or gas, the benefit is reduced.
This connection between grid carbon intensity and heat pump performance is one reason the technology is more effective in some regions and sectors than others. For sustainability managers, understanding the emissions factor of the local grid is a necessary step before calculating the actual carbon benefit of a heat pump installation.
What types of heat pumps are used in industry?
Industrial heat pumps fall into three main categories based on their heat source: air-source, water-source, and ground-source. A fourth category, industrial high-temperature heat pumps, is specifically engineered for process heat applications and can reach output temperatures above 100°C, though typically below 160°C.
- Air-source heat pumps extract heat from outdoor air. They are the most common and easiest to install, but their efficiency drops significantly in cold climates.
- Water-source heat pumps use rivers, lakes, or groundwater as the heat source. They offer more stable performance than air-source systems because water temperature fluctuates less than air temperature.
- Ground-source heat pumps extract heat from the soil via buried pipes. They are highly efficient but require significant land area and upfront installation work.
- High-temperature industrial heat pumps are designed for process heat applications and can upgrade waste heat from industrial processes to usable temperatures for steam or hot water production.
For most industrial applications, high-temperature heat pumps are the relevant category. They are best suited to processes that generate recoverable waste heat and require output temperatures in the 80°C to 150°C range.
What are the limitations of heat pumps for industrial heating?
The main limitation of heat pumps for industrial heating is temperature. Most commercial heat pumps deliver heat in the range of 60°C to 120°C. Many industrial processes, including sterilisation, drying, chemical reactions, and paper production, require temperatures between 200°C and 1,000°C or higher. At those temperatures, heat pumps are not a viable option with current technology.
Beyond temperature, there are practical constraints worth considering:
- Electricity demand: Heat pumps require a reliable, high-capacity electricity supply. Industrial sites with limited grid connections may face costly infrastructure upgrades before installation is even possible.
- Capital cost: High-temperature industrial heat pumps require significant upfront investment, and the economics depend heavily on the local electricity price relative to the fossil fuel being replaced.
- Waste heat availability: The most efficient industrial heat pump applications rely on recovering waste heat from within the process. Sites without accessible waste heat streams see lower performance and worse economics.
- Space and installation complexity: Ground-source systems in particular require considerable land and civil engineering work, which is not always feasible at existing industrial sites.
For sectors such as food and beverage or pulp and paper, where high-temperature steam is central to the production process, these limitations mean heat pumps alone cannot cover the full decarbonisation requirement. They are often part of a broader solution rather than a standalone answer.
How do heat pumps compare to other clean heating technologies?
Heat pumps are most competitive for low-to-medium-temperature applications below roughly 150°C. Compared with hydrogen combustion, electric resistance heating, biomass boilers, and iron fuel technology, heat pumps offer high efficiency at lower temperatures but lose their advantage as process temperatures rise. Each technology has a different cost profile, infrastructure requirement, and temperature ceiling.
Hydrogen combustion can reach very high temperatures and produces no direct CO₂ emissions, but it requires hydrogen supply infrastructure, which remains limited and costly in most regions. Electric resistance heating covers a wide temperature range but is energy-intensive and expensive to run at scale. Biomass can deliver high-temperature heat but raises questions about fuel supply sustainability and local air quality.
Iron fuel technology occupies a different position in this comparison. It produces flame temperatures of up to 2,000°C, making it suitable for the high-temperature industrial heat that heat pumps cannot reach. It is designed as a drop-in complement to existing boiler infrastructure rather than a replacement that requires a full site redesign. For industries where high-temperature heat is the core challenge, Iron Fuel Technology addresses a gap that heat pumps and many other clean technologies leave open.
When is a heat pump the right choice for industrial decarbonisation?
A heat pump is the right choice when the process temperature requirement is below 150°C, the site has access to reliable renewable electricity, and there is a recoverable heat source available to feed the system. Under these conditions, a heat pump delivers strong efficiency and meaningful emissions reductions at competitive operating costs.
Specific situations where heat pumps tend to perform well include space heating and cooling in industrial buildings, low-temperature process water heating, and heat recovery from refrigeration or cooling systems already present on site. Food and beverage operations with pasteurisation steps in lower temperature ranges and facilities with substantial waste heat available are good candidates.
When the process demands temperatures above 150°C, when the electricity grid connection is constrained, or when the site cannot accommodate the infrastructure requirements, other technologies are likely to be more practical. The honest answer is that heat pumps are one tool among several, and the right choice depends on a clear-eyed assessment of the specific site, process, and energy profile.
For sustainability managers evaluating options, the most productive approach is to map the temperature profile of all heat demands across the site first, then assess which technologies can meet each requirement technically before comparing costs. Many industrial sites will end up with a combination of technologies rather than a single solution. You can explore the full range of clean heat solutions for industrial processes to understand where different technologies fit.
How Iron Fuel Technology helps with industrial heat decarbonisation
We developed Iron Fuel Technology specifically to address the industrial heat challenge that heat pumps and other low-temperature solutions cannot fully solve. Where heat pumps reach their ceiling, our technology begins to deliver.
- Produces high-temperature heat with zero direct CO₂ emissions and ultra-low NOₓ
- Achieves energy efficiency of up to 95%, outperforming many traditional fossil fuel boilers
- Integrates with existing boiler infrastructure, so you do not need to redesign your site
- Operates on a circular fuel cycle: iron powder burns cleanly, iron oxide is collected and regenerated using hydrogen, and the cycle repeats
- Backed by long-term fuel supply agreements, giving your operations the reliability they need
If your site has high-temperature heat requirements that electrification or heat pumps cannot cover practically or affordably, we are ready to talk through what Iron Fuel Technology could look like for your operation. Get in touch with our team to start the conversation.