Large continuous furnaces are part of an integrated line. If the furnace stops, downstream production stops.

So, the real question becomes:

How do you start the transition to electric heating without bringing the entire operation to a halt?Arthur Moslow, Electrification Project Manager, Kanthal.

Arthur Moslow, Electrification Project Manager at Kanthal, begins by explaining the physical realities of the system.

“When a customer wants to electrify, we start with the hard constraints,” Moslow remarks. “What does the electrical system actually allow? How much additional load can the plant take today? And how is the furnace configured?”

From there, the discussion becomes specific. Some zones carry lower temperatures and lower power demand. Those are often the logical starting points. Other modifications, such as adding electric heating to the recirculating exhaust system, can increase overall heat input without requiring a complete redesign.

If a full conversion requires a substantial increase in electrical capacity, that becomes part of the longer-term infrastructure plan. It does not stop the transition.

“You don’t have to solve everything at once. Take the first technically sound step within the limits of the facility. Then you build from there,” Moslow explains.

Converting in stages instead of all at once

In recent years, Kanthal has seen a clear shift toward partial electrification.

“More customers are asking to convert a portion of the furnace first,” Moslow shares. “They don’t want to wait for a full rebuild, and they can’t justify a prolonged shutdown. So, we look at what can be done now.”

Large continuous furnaces make that possible. Because they are divided into zones, conversion does not have to happen all at once.

“We focus on the areas with lower electrical demand. Preheat zones are often suitable. Soak zones as well, where the temperature is stable rather than aggressively ramped. From a power perspective, those are easier starting points,” Moslow elaborates.

The advantages of electrification don’t depend on whether you convert 30 percent or 100 percent. They’re built into the physics of electric heating.

The work is typically aligned with scheduled maintenance. One or two zones are converted, the furnace returns to operation, and the next phase is planned.

With this approach, the upgrade becomes a measured progression rather than a single disruptive event.

Using existing heat more effectively

Electrification does not have to start in the primary heating zones. In many cases, it begins in the exhaust system.

“In typical furnace designs, exhaust gases are recirculated to maximize heat recovery. Adding electric heating to that recirculation loop increases the energy returned to the furnace, effectively boosting capacity without redesigning the primary heating system.”

Air heating cassettes and duct heaters can often be integrated into existing duct runs with limited structural modification.

“You’re not replacing the furnace. You’re increasing the enthalpy of the recovered heat. That reduces the load on the burners and improves overall heat balance.”

For many operations, this becomes a practical first step. It delivers measurable impact while avoiding major interruption to production.

Selecting the appropriate heating technology

The heating technology is determined by temperature level and process conditions.

“In lower temperature zones, metallic elements are often the practical choice. Heating elements made of Kanthal® (FeCrAl) or Nikrothal® (NiCr) alloys and tubular solutions like Tubothal® or Kanthal® APM are generally straightforward to integrate when you’re converting in stages,” Moslow adds.

Higher temperature sections require a different approach. Globar® silicon carbide (SiC) or Kanthal® Super molybdenum disilicide (MoSi₂) heating elements are typically considered in those environments.

“Once you move into higher operating temperatures, the design constraints change. Mechanical layout, safety, power density — all of that has to be evaluated carefully. You don’t apply the same installation logic across the entire furnace.”

Conversion, in other words, is not about selecting a product. It is about matching the heating technology to the thermal profile and the electrical capacity of each zone.

The long-term advantages remain the same

Whether electrification is full or phased, the long-term advantages remain the same.

• Improved energy efficiency - Electric systems can approach nearly 100 percent thermal efficiency compared to combustion-based systems.
• Higher thermal efficiency inside the furnace - Heat remains within the chamber rather than being lost with exhaust gases.
• Precise temperature control - Electric systems respond quickly and allow tighter regulation of process temperature.
• Excellent temperature uniformity - Even heat distribution improves repeatability and product quality.
• Cleaner, quieter, and safer operation - No combustion gases are emitted inside the facility.
• Zero CO₂ emissions at the point of use - When powered by fossil-free electricity, the heating process operates without direct emissions.
• Reduced maintenance - The absence of combustion byproducts limits oxidation, fouling, and cleaning requirements.

“These advantages don’t depend on whether you convert 30 percent or 100 percent. They’re built into the physics of electric heating,” Moslow assures.

A controlled transition

“We work with the furnace builder and the end user. We look at the process requirements, the temperature profile, and the available electrical capacity. Then we define what can be converted first, and how to do it during normal maintenance periods.”

Kanthal designs the electric heating system to fit within the plant’s existing constraints. The goal is controlled progression by introducing electric heating in a way that protects throughput and aligns with long-term infrastructure plans.

Production continuity does not become less important once a furnace is electric. In many cases, it becomes even more critical.

“Hot replacement is a common question,” Moslow explains. “If an element fails, customers want to replace it without cooling the entire furnace and stopping production.”

In many configurations, that is achievable when access and safety are considered during the design phase. It is not universal, and higher temperature systems require stricter procedures, but it can be engineered into the solution from the start.

Whether transitioning from gas to electric or optimizing an existing electric furnace, the priority remains consistent: maintain production while improving the heating system.

Electrification, done properly, is not a disruption. It is a progression.