For UK manufacturers, food processors, hospitals and large commercial sites, the boiler house is often the single largest source of on-site carbon emissions. As the country moves toward its net-zero targets, the question facing facilities and engineering managers is no longer whether to decarbonise process heat, but how — and which fuel pathway makes commercial and operational sense.
Unlike domestic heating, where heat pumps have emerged as the clear front-runner, industrial heat is a far messier problem. Process temperatures, load profiles, fuel availability and capital constraints all pull in different directions. This guide breaks down the three boiler technologies most often weighed up in UK industrial settings — gas-fired, electric and hydrogen — and the practical trade-offs behind each.
Why Industrial Heat is a Different Decision to Home Heating
Around a fifth of the UK’s carbon emissions come from heating, and the Climate Change Committee has been consistent on one point: hydrogen should be reserved for the sectors where electrification is genuinely difficult, such as heavy industry and dispatchable power, rather than spread thinly across applications where electric alternatives already work.
That single piece of policy guidance reshapes the whole conversation. For a home, the answer is usually a heat pump. For a factory needing high-pressure steam at consistent volumes, the calculus is entirely different. The right choice depends on four questions:
- What process temperature and steam pressure does the site actually need?
- How large and how variable is the heat load?
- What fuels can realistically be supplied to the site, now and in five years?
- What is the balance between upfront capital cost and long-term running cost?
With those framing questions in mind, here is how the three options stack up.
Gas-fired Boilers: The Proven Workhorse
Natural gas remains the default for most UK industrial steam and hot water systems, and for good reason. Modern gas-fired units deliver high output, handle large and variable loads comfortably, and carry the lowest capital cost of the three options. The supporting infrastructure, the service networks and the engineering know-how are all mature.
The strongest case for gas today is in high-temperature, high-volume process applications where electrification is impractical and hydrogen supply is not yet available. A well-specified, high-efficiency unit such as an EPCB Gas Fired Boiler can deliver reliable industrial steam while keeping fuel consumption — and therefore emissions per unit of output — as low as current gas technology allows.
The obvious limitation is carbon. Even the most efficient gas boiler still burns a fossil fuel, so it is increasingly viewed as a transition technology rather than a long-term endpoint. The smart move for many operators is to specify equipment that is efficient now but can be adapted later — which is exactly where dual-fuel and hydrogen-ready designs come in.
Best suited to: high-temperature process heat, large or fluctuating loads, sites where capital budget is tight and rapid deployment matters.
Electric Boilers: Clean at the Point of Use, but Watch the Load
Electric boilers produce zero emissions at the point of use, and when powered by renewable electricity they offer a genuinely low-carbon heat source. They are compact, quiet, require no flue or combustion management, and are simple to install and maintain.
The challenge is twofold. First, electricity costs significantly more per kWh than gas in the UK, so running costs can be punishing for high-demand sites. Second, very large industrial loads can strain — or exceed — the available grid connection, sometimes requiring expensive upgrades.
For these reasons, electric boilers tend to make most sense for smaller industrial and commercial loads, for sites with their own renewable generation, or as part of a hybrid setup that handles base load electrically while another source covers peaks.
Best suited to: lower-to-moderate loads, sites with on-site renewables or favourable tariffs, applications where on-site emissions and air quality are priorities.
Hydrogen Boilers: Promising, but Still Maturing
Hydrogen burns with zero carbon emissions and, crucially for industry, can reach the high temperatures that heat pumps and electric systems struggle with. This is precisely why the Climate Change Committee points to industry as one of hydrogen’s most logical homes.
The reality on the ground is that the technology is still early. There is no national hydrogen pipeline network, green hydrogen production at scale is some years away, and current costs sit above natural gas. What is emerging, however, is the dual-fuel approach — boilers that run on a hydrogen/natural gas blend and can shift toward higher hydrogen content as supply matures.
This is not theoretical. In a notable UK example, consumer goods manufacturer Kimberly-Clark is installing dual-fuel hydrogen/natural gas boilers at its plants in Barrow-in-Furness and Northfleet, with the units expected to cut natural gas consumption by around half and reduce emissions by tens of thousands of tonnes a year once operational. Projects like this show how industrial operators can begin the hydrogen transition without abandoning the reliability of gas.
Best suited to: forward-looking sites with high process temperatures, operators who want to future-proof against decarbonisation deadlines, and facilities positioned near planned hydrogen infrastructure.
A Practical Way to Decide
There is no single winner — the right answer is the one that fits your site’s specific load, temperature requirement and fuel reality. A useful sequence for the decision is:
- Define the process need first. Temperature and steam pressure narrow the field faster than anything else. Very high temperatures effectively rule out heat pumps and limit electric options.
- Map your fuel reality. Check your grid connection capacity for electric, and your proximity to current or planned hydrogen supply.
- Model total cost of ownership, not just capital. A cheaper gas unit can cost more over its life if running costs or future retrofits are not accounted for.
- Build in flexibility. Where full electrification or hydrogen is not yet viable, a high-efficiency gas or dual-fuel boiler that can adapt later protects the investment.
For most UK industrial sites today, the pragmatic route is a high-efficiency gas or hydrogen-ready dual-fuel boiler as the near-term workhorse, with electrification deployed where loads and tariffs allow. As green hydrogen scales and grids decarbonise, the balance will shift — but the operators who plan for flexibility now will be the ones who avoid stranded assets later.
Specifying a new industrial boiler is a long-term commitment. Engaging an experienced boiler engineer early — and choosing equipment built around both efficiency and future adaptability — is the single best way to keep both your emissions and your running costs under control. Manufacturers such as EPCB offer a full range of industrial steam and hot water boilers spanning gas, electric and dual-fuel designs, which can be a useful starting point when comparing options across the different fuel pathways discussed above.
