Cleaning Industrial Heat, How Heat Pumps Could Transform India’s Manufacturing Economy
Industry accounted for nearly half of India’s final energy consumption in 2025, much of it still tied to fossil fuels. The story becomes even sharper when we look at process steam. Industrial process steam alone is estimated to have generated 182 million metric tonnes of CO₂ annually in India, along with 595 kilotonnes of SO₂, 520 kilotonnes of particulate matter, and 516 kilotonnes of NOx. This is why cleaning up industrial heat is not just a climate question. It is also an air quality, competitiveness, energy security, and worker health question.
Industrial decarbonisation is often framed through headline-grabbing solutions such as green hydrogen and carbon capture. These pathways are essential, particularly for hard-to-abate sectors like steel and cement, but they are still several years away from large-scale adoption. Meanwhile, a significant share of India’s manufacturing operates under very different conditions—not defined by extreme temperatures but by the widespread demand for low-to-medium temperature process heat. Across sectors such as textiles, food processing, chemicals, pharmaceuticals, and paper and pulp, this heat forms the backbone of production and continues to be largely met through combustion. This article examines how industrial heat pumps offer a practical, available, and efficient solution to clean up this vast segment of industrial energy use.
Part I: The Scale of the Problem – Industry’s Hidden Emissions
When we think of industrial pollution, we often picture towering chimneys belching smoke. But the reality is more mundane and more pervasive. Millions of small and medium-sized boilers, thermic fluid heaters, dryers, evaporators, and hot-water systems burn coal, firewood, biomass, gas, and furnace oil to produce the heat that drives Indian manufacturing.
These systems are everywhere. They are in textile finishing units in Surat and Tirupur. They are in food processing plants in Punjab and Maharashtra. They are in paper mills in Andhra Pradesh and pharmaceutical factories in Gujarat. They are the hidden backbone of India’s industrial economy.
The emissions from these systems are staggering. Beyond CO₂, they release sulphur dioxide (SO₂), nitrogen oxides (NOx), and particulate matter (PM)—pollutants that cause respiratory disease, cardiovascular illness, and premature death. Fossil-fuel-driven air pollution caused an estimated 1.72 million premature deaths in India in 2022, with industrial heat systems being a key source of these emissions.
For micro, small, and medium enterprises (MSMEs), which form the backbone of India’s manufacturing economy, the problem is particularly acute. Spread across millions of units, MSMEs account for a smaller share of total industrial emissions (around 17 per cent), but their emissions are more fragmented and concentrated in sectors such as textiles, food processing, and paper—precisely the sectors where low-to-medium temperature heat is most needed.
Part II: The Technology Solution – How Industrial Heat Pumps Work
Heat pumps enter this conversation as one of the most practical technologies for this specific frontier of industrial heat. Unlike boilers, heat pumps do not create heat by burning fuel. They move and upgrade heat from one stream to another, using electricity. This is why they can deliver more useful heat than the electricity they consume.
The physics is elegant. A heat pump extracts heat from a source (ambient air, water, or waste heat from another process), compresses it to a higher temperature, and delivers it where it is needed. Because it moves heat rather than creating it from scratch, its efficiency can be remarkably high.
Industrial heat pumps often have a coefficient of performance (COP) of 3 to 5, meaning they can provide three to five units of heat for every unit of electricity consumed. Even at higher output temperatures, where performance falls, they can remain more efficient than simple electric resistance-based heating. This efficiency is the core of their decarbonisation value. It reduces the amount of electricity needed to electrify heat and improves the economics of switching away from combustion. If renewable electricity is available at competitive rates, the effective cost of heat from a heat pump becomes attractive even against conventional fuels.
Part III: The Inefficiency of Conventional Systems – A Case Study from Surat
What makes this transition compelling is the way industrial heat is currently produced and used. Consider a medium-sized textile finishing unit studied in Surat. Around 92 per cent of its energy load was thermal, delivered through steam and industrial heat using a mix of Indonesian coal and lignite. The unit consumed roughly 0.42 kg of Indonesian coal per metre of processed fabric, illustrating the material intensity of fuel use embedded in routine operations.
Despite this, steam is often used indirectly—for generating hot water, maintaining vessel temperature, or heating surfaces—rather than directly heating the product. This reflects a central inefficiency. Conventional industrial thermal systems are often designed around the highest heat requirement, with boilers sized to meet peak demand. But many loads require lower-quality heat. In such cases, steam is generated at higher temperature and pressure, then reduced or diverted for lower-temperature applications.
This is like using a rocket engine to toast bread. It works, but it is wildly inefficient.
Industrial heat pumps require a different engineering mindset: start with the lowest-temperature heat demand, then boost heat only where needed. This reverses the legacy boiler approach and can reduce overall energy use by 40–60 per cent in suitable applications. By integrating heat pumps, factories can match heat quality to heat demand, eliminating the waste inherent in generating high-temperature steam for low-temperature tasks.
Part IV: Beyond Carbon – Health, Safety, and Air Quality Benefits
Cleaning industrial heat is not just about CO₂. It is about the air that workers breathe and the communities that live near factories. Combustion-based process heat contributes to emissions of harmful air pollutants, exacerbating respiratory and cardiovascular health risks. The public health dimension is significant.
Workplace heat exposure is emerging as a serious occupational health risk, especially in labour-intensive factory environments where internal process heat compounds rising ambient temperatures. Globally, over 2.4 billion workers are exposed to excessive heat at work, with the highest exposure rates in Asia and the Pacific. Prolonged workplace heat is linked to heat exhaustion, heat stroke, cardiovascular strain, kidney disease, accident risk, and reduced cognitive performance.
Heat pumps can improve worker health and safety in two ways. First, by displacing on-site combustion, they eliminate the emissions that cause respiratory and cardiovascular disease. Second, they can create opportunities for spot and space cooling to improve thermal comfort on factory floors. Some industrial heat pump systems can provide both heating and cooling, integrating what were previously separate systems into a single, efficient unit.
Part V: The MSME Opportunity – Fragmented Emissions, Scalable Solutions
The opportunity is especially important for India’s MSMEs. Spread across millions of units, these enterprises form the backbone of the country’s manufacturing economy. But they also face unique barriers to decarbonisation: limited capital, lack of technical expertise, fragmented supply chains, and difficulty accessing financing.
Heat pumps are well-suited to the MSME context. They are modular, scalable, and can be deployed incrementally. A factory need not replace its entire boiler system at once; it can install a heat pump to serve a specific low-temperature process, then expand over time. The efficiency gains (40–60 per cent energy reduction) mean that payback periods can be attractive, particularly where electricity is reliable and renewable energy is available.
However, MSMEs also need support. Technical assistance to identify suitable applications, financing mechanisms (such as on-bill financing or equipment leasing), and quality assurance for installers are all essential. Without these, the technology will remain out of reach for the smallest units.
Part VI: The Systems Transition – Beyond Technology Alone
What emerges is not just a technology shift but a systems transition. Scaling industrial heat pumps will depend on how well they are embedded into existing industrial ecosystems through better process integration, reliable access to low-cost electricity, and financing models that work for industries, especially MSMEs.
Three enabling conditions are critical:
First, reliable and affordable renewable electricity. Heat pumps run on electricity. If that electricity is coal-based, the emissions benefits are reduced (though still positive, given heat pumps’ efficiency). If it is renewable, the benefits are transformative.
Second, technical expertise and workforce training. Designing and installing industrial heat pump systems requires a different engineering mindset than traditional boiler systems. India’s engineering colleges and vocational training institutes must incorporate industrial heat pumps into their curricula.
Third, policy support and financing. The government can accelerate adoption through tax incentives, accelerated depreciation, and low-interest loans for heat pump installations. State-level energy efficiency programmes can include heat pumps as a eligible technology.
Conclusion: A Resilient, Efficient, and Safer Model of Growth
Industrial heat pumps are not a silver bullet. They cannot replace the extreme-temperature heat needed for steelmaking or cement production. For those hard-to-abate sectors, green hydrogen and carbon capture remain essential—though still years away from scale.
But for the vast majority of industrial heat demand in India—the low-to-medium temperature processes that underpin textiles, food processing, chemicals, pharmaceuticals, and paper—heat pumps offer a practical, available, and economically attractive solution. They reduce energy use by 40–60 per cent. They eliminate on-site combustion and its associated air pollutants. They improve worker health and safety. And they can be deployed today.
Cleaning industrial heat is not just a climate issue. It is an air quality, competitiveness, energy security, and worker health issue. Done right, the transition to industrial heat pumps can unlock not just emissions reduction, but a more resilient, efficient, and safer model of industrial growth for India.
5 Questions & Answers Based on the Article
Q1. How much CO₂ is generated annually by industrial process steam in India, and what other pollutants are emitted?
A1. Industrial process steam alone is estimated to generate 182 million metric tonnes of CO₂ annually in India. In addition to CO₂, it emits 595 kilotonnes of SO₂, 520 kilotonnes of particulate matter, and 516 kilotonnes of NOx. These pollutants cause respiratory and cardiovascular disease, with fossil-fuel-driven air pollution causing an estimated 1.72 million premature deaths in India in 2022. Industrial heat systems are a key source of these emissions.
Q2. How do industrial heat pumps work, and what is their coefficient of performance (COP)?
A2. Unlike boilers that create heat by burning fuel, heat pumps move and upgrade heat from one stream to another using electricity. They extract heat from a source (ambient air, water, or waste heat from another process), compress it to a higher temperature, and deliver it where needed. Industrial heat pumps often have a coefficient of performance (COP) of 3 to 5, meaning they can provide three to five units of heat for every unit of electricity consumed. This efficiency is the core of their decarbonisation value.
Q3. What inefficiency did the case study of a textile finishing unit in Surat reveal about conventional industrial thermal systems?
A3. The Surat textile finishing unit had 92 per cent of its energy load as thermal, delivered through steam using Indonesian coal and lignite. It consumed roughly 0.42 kg of coal per metre of processed fabric. The key inefficiency is that conventional systems are designed around the highest heat requirement, generating steam at high temperature and pressure, then reducing it for lower-temperature applications. This is like using a rocket engine to toast bread. Industrial heat pumps reverse this approach by starting with the lowest-temperature heat demand and boosting heat only where needed, reducing overall energy use by 40–60 per cent.
Q4. Beyond carbon emissions, what are the health and safety benefits of switching to industrial heat pumps?
A4. Industrial heat pumps offer two major health benefits. First, by displacing on-site combustion, they eliminate emissions of SO₂, NOx, and particulate matter, which cause respiratory and cardiovascular disease. Second, heat pumps can improve worker thermal comfort. Globally, over 2.4 billion workers are exposed to excessive heat at work, linked to heat exhaustion, heat stroke, cardiovascular strain, kidney disease, accident risk, and reduced cognitive performance. Heat pumps can provide both heating and cooling, enabling spot and space cooling on factory floors.
Q5. Why are micro, small, and medium enterprises (MSMEs) particularly important for heat pump deployment, and what support do they need?
A5. MSMEs account for around 17 per cent of industrial emissions, but their emissions are more fragmented and concentrated in sectors where low-to-medium temperature heat is needed (textiles, food processing, paper). Spread across millions of units, they are the backbone of India’s manufacturing economy. Heat pumps are well-suited to MSMEs because they are modular, scalable, and can be deployed incrementally. However, MSMEs need technical assistance to identify suitable applications, financing mechanisms (on-bill financing or equipment leasing), and quality assurance for installers. Policy support through tax incentives, accelerated depreciation, and low-interest loans is also critical.
