Every new process heating technology eventually gets pitched as a universal replacement for what came before. Modular electric heaters are not that. They solve a specific set of problems very well, and they’re a poor fit for others. Being honest about that is the difference between a technology that gets adopted on its merits and one that gets oversold, installed in the wrong places, and dismissed.
This post is a practical guide to where modular electric fits — and where it doesn’t.
Where it fits well
Moderate-duty process heating, 200 kW to 10 MW. This is the sweet spot. Below 200 kW, a single conventional circulation heater is usually simple and cheap enough that modularity doesn’t add much. Above 10 MW, the electrical infrastructure required (switchgear, service entrance upgrades, transformer capacity) starts to dominate the economics, and fired equipment often wins on total installed cost.
Process fluids in the 80°C to 400°C range. Thermal oils, glycol mixtures, pressurized water, light hydrocarbons, and chemical intermediates all sit comfortably in this range. Electric heating is clean, precise, and well-suited to fluids that can’t tolerate the temperature swings of fired equipment.
Facilities with active ESG or decarbonization targets. Specialty chemicals, pharma, food and beverage, and contract manufacturing are all under increasing pressure to cut Scope 1 emissions. Replacing a gas-fired heater with electric eliminates combustion at the heater, and modular construction makes phased deployment realistic. You can replace one line at a time instead of committing to a full site retrofit.
Applications where uptime matters more than cheapest kW. Continuous processes — reactors, distillation columns, crystallizers, thermal fluid loops — lose a lot of money per hour of downtime. If an unplanned outage costs six figures, paying a modest premium for a heater you can service without shutting down the process is an easy trade.
Sites with constrained footprint or difficult access. Modular units arrive factory-tested and assembled. Commissioning is days, not months. For revamps, pilot plants, or facilities where the yard is already crowded, this matters.
Where it doesn’t fit
Very high capacity applications. Above ~10 MW, you’re typically better off with a fired tube heater or a steam-driven solution. The economics of electricity vs. natural gas flip at scale, and the electrical service requirements become a project in themselves.
High-temperature processes above 500°C. Most electric process heaters top out below 450°C for practical reasons — element metallurgy, tube material limits, and heat flux constraints. Some specialty applications can push higher, but for high-temperature petrochemical or refining duty, fired heaters remain the right answer.
Cheap fuel, expensive power. In regions with very low-cost natural gas and high industrial electricity rates, the operating cost delta for electric heating can be hard to close. Carbon pricing, demand response programs, or on-site generation can change this calculation, but it’s worth running the numbers before assuming electric wins.
Batch processes with long idle periods. Modular electric shines on continuous or near-continuous duty, where high utilization amortizes the capital cost and the uptime advantage pays off. For batch operations that run a few hours a week, a simple circulation heater is often the right answer.
Applications already well-served by steam. If you have a plant steam header with spare capacity, using it for process heating is almost always cheaper than installing dedicated electric equipment. Modular electric starts to make sense when you need duty the steam system can’t cover, or when you’re trying to reduce boiler load for decarbonization reasons.
The honest middle ground
There’s a large band of applications where the answer isn’t obvious and depends on specifics: fuel prices, grid reliability, maintenance philosophy, decarbonization timeline, capex vs. opex priorities. Modular electric may be the right answer, or a conventional circulation heater may be. The useful questions to ask are:
- What does a failure cost you? If an unplanned outage is a routine inconvenience, the uptime advantage of a modular approach is less valuable. If it stops production, it’s very valuable.
- How stable is your duty? If your load is going to change in the next five years — new product lines, capacity expansion, demand variability — scalability matters. If it’s locked in, it matters less.
- What’s your electrification timeline? If you’re planning to cut fuel use regardless, you’re going to electrify something. Starting with the applications that fit modular electric well is usually easier than starting with the hardest ones.
- Who’s going to maintain it? In-house maintenance teams tend to prefer equipment they can service without specialized contractors. Modular, field-replaceable construction is a real advantage here.
The short version
Modular electric heaters are a good fit when you need 200 kW to 10 MW of clean, precise heat for a continuous or near-continuous process, in a temperature range up to ~450°C, and uptime and flexibility matter more than the cheapest possible capital cost per kW. They’re not a universal replacement — they’re a better answer to a specific and increasingly common problem.
If your application sits in that band, they’re worth evaluating seriously. If it doesn’t, there’s no reason to force it.