Choosing the wrong induction heater is a more expensive mistake than most maintenance and procurement teams expect. Under-specify the power rating and you wait significantly longer for heating to complete — or worse, fail to reach the target temperature on large components. Over-specify and you pay for capacity you never use on most jobs. Choose the wrong product family entirely and you have a machine that physically cannot do the task. Vivid Metrawatt’s induction heater range spans two distinct product families — the EHS/EHML series for precision bearing and shrink-fit heating, and the MF Quick-Heater (EHF) series for heavy industrial heating of bolts, flanges, pipes, and large components of any shape. This Induction heater selection guide maps every model in both families to the application, component size, and industry it is confirmed for — so you can make the right selection on the first enquiry.
Table of Contents
Vivid Metrawatt’s induction heater range is organised into two product families that serve different primary use cases. Understanding this division before looking at individual models is the most important first step in the selection process.
The EHS/EHML series is purpose-designed for the precision heating of bearings and other shrink-fit components prior to mounting on a shaft. The component is placed on the machine’s yoke — an electromagnetic core that creates the alternating magnetic field — and the induced current heats the component from within. Four models cover a range from small maintenance-shop bearings up to very large industrial bearings weighing up to 700 kg. All models feature intelligent microcontroller-based electronic controls with automatic temperature and demagnetization functions.
The models in this family are: EHS/EHSU:4, EHS/EHSU:8, EHS/EHSU:16, and EHML:25/40.
The EHF series uses medium-frequency (MF) generator technology with fixed or flexible inductors. Unlike the EHS/EHML yoke-based system, the EHF series is not limited to cylindrical components — flexible inductors can be wound around components of any size or shape, making it suitable for bolt heating, flange preheating, pipe end heating, large rotor heating, and other applications where the component cannot be placed on a yoke. Its compact dimensions make it easy to move to the work location. Three power models are available: 22kW, 33kW, and 44kW.
Selection rule #1: If your primary application is bearing mounting or shrink fitting of components that can be placed on a yoke → start with the EHS/EHML series. If your primary application involves bolts, flanges, pipes, large rotors, or any component that cannot be placed on a fixed yoke → start with the EHF MF Quick-Heater series. If you do both regularly, you may need one from each family.
Both product families use electromagnetic induction as the heating principle — but they apply it differently based on the component type being heated.
In both cases, an alternating current passes through a coil or inductor, creating an alternating electromagnetic field. When an electrically conductive (and in bearing applications, ferromagnetic) component is placed within this field, eddy currents and magnetic hysteresis losses are induced inside the material. These losses produce heat directly within the component — not by contact, not by flame, and not from an external element radiating heat onto the surface.
This means the heat is generated inside the workpiece itself, making induction heating significantly faster and more energy-efficient than oil bath heating, resistance heating, or open-flame methods. For a detailed technical comparison of induction heating efficiency versus alternative methods, see our guide on induction heating vs resistance heating.
The practical consequence for component heating is precise temperature control, no contact damage to the component surface, and automatic demagnetization after heating — a critical safety requirement for bearings, which must be free of residual magnetism before installation.
The EHS/EHML series is Vivid Metrawatt’s bearing and shrink-fit induction heater range. All four models share the same intelligent microcontroller-based control system with Temperature mode and Time mode operation, automatic temperature cutoff, and automatic demagnetization. The models scale in power capacity and the maximum bearing weight they can handle effectively.
Model: 4 (3.5/4.0 KVA)
Product page: INDUCTION HEATER – EHS/EHSU:4
The EHS/EHSU:4 is lightweight and portable — designed for workshops and maintenance teams that need to move the unit between machines or between bays. At 3.5/4.0 KVA, it handles bearings and shrink-fit components at the smaller end of the industrial range. It operates in both Temperature mode and Time mode, both controlled through a feather touch keyboard. Both modes can be monitored simultaneously during operation.
A pair of Raiser Blocks (55 × 55 × 125 mm) extend the unit’s capability to bearings of larger bore diameter. The unit can also heat a plate of any magnetic material by placing the plate across the horizontal yoke — making it useful for general shop heating tasks beyond bearing mounting. This is the correct starting point for a workshop that is new to induction heating or whose bearing sizes are predominantly small to medium.
Best for: Small maintenance workshops, first-time induction heater users, small to medium bearings, light shrink-fit components.
Model: 8 (6/8 KVA)
Product page: INDUCTION HEATER – EHS/EHSU:8
The EHS/EHSU:8 steps up to 6/8 KVA capacity with intelligent microcontroller-based electronic controls identical in character to the EHS:4. At approximately 86 kg, it is a heavier unit suited to a fixed or semi-fixed workshop position. It can heat a bearing of 40 kg to 50 kg to a temperature of 100°C in 6-7 minutes — confirmed from the product page.
This model is provided with a manual or automated Roll-Sliding Arrangement for the standard yoke (80 × 80 × 490 mm). The roll-sliding system is engineered so the yoke lifts mechanically or rolls off automatically from the vertical supports without rubbing, damaging, or scraping mating surfaces — providing additional safety, ease of operation, and improved productivity over manual yoke removal.
Best for: Established motor repair shops, industrial maintenance departments with medium-range bearing sizes (up to 40–50 kg), facilities upgrading from the EHS:4.
Model: 16 (11/16 KVA)
Product page: HEATER – EHS/EHSU:16
The EHS/EHSU:16 carries the same intelligent microcontroller-based electronic control as the EHS:4 and EHS:8, at 11/16 KVA capacity. At approximately 86 kg, the instrument has the same physical weight class as the EHS:8 but significantly higher power output. It can heat a bearing of 40 kg to 50 kg to a temperature of 100°C in 6-7 minutes — and its higher KVA rating means faster heating cycles and the ability to handle heavier or more thermally demanding components.
Like the EHS:8, this model is provided with a manual or automated Roll-Sliding Arrangement for the standard yoke (80 × 80 × 490 mm) — the same safety and productivity benefit: the yoke lifts mechanically or automatically rolls off without damaging contact surfaces.
This is the correct choice for facilities that regularly handle bearings at or near the upper limit of the EHS:8’s comfortable operating range, or that need faster cycle times on medium-to-large bearings.
Best for: Heavy maintenance departments, motor overhaul facilities, industrial plants with large bearing populations, facilities where cycle time is a productivity priority.
Model: 25/40 (25/40 KVA)
Product page: INDUCTION HEATER – EHML:25/40
The EHML:25/40 is the highest-capacity model in the EHS/EHML bearing heater family. At 25/40 KVA and approximately 300 kg, it is a floor-standing heavy industrial machine designed for facilities that regularly work with very large bearings. It can heat a bearing of up to 700 kg to the required temperature in a customised time — confirmed from the product page. This is a specification that no smaller model in the range can approach.
The EHML:25/40 is provided with manual or automated Roll-Sliding Arrangement for the standard yoke (105 × 105 × 590 mm) — a larger yoke configuration than the EHS:8 and EHS:16 to accommodate the larger component sizes this model is designed to handle. The roll-sliding system operates on the same safety principle: the yoke lifts mechanically or automatically rolls off from the vertical supports without contact damage.
Controls are intelligent microcontroller-based electronic controls, consistent with all other models in the EHS/EHML series. Custom solutions are available from Vivid Metrawatt for non-standard component sizes.
Best for: Power generation plants, wind energy maintenance, heavy industry, railway maintenance depots, large motor overhaul facilities, any facility regularly working with bearings above 50 kg.
The EHF MF Quick-Heater series uses medium-frequency generator technology with fixed or flexible inductors to heat metal components of any size or shape — not only cylindrical components that can be placed on a yoke. This makes it the correct product family for bolt heating, flange preheating, pipe end heating, large rotor heating, and any application where the component must be heated in situ rather than placed on a bench-mounted machine.
The MF Quick-Heater consists of a generator and a fixed or flexible inductor. Its compact dimensions make it easy to move to the work location. VIVID MF Quick-Heaters result in significant time savings: fewer setup actions than conventional methods, faster heating due to direct electromagnetic energy transfer to the workpiece, and much more efficient energy use than oil baths, open flames, or resistance heating.
One of the major advantages of the EHF series is that flexible inductors can be wound around any size or shape of component — making it possible to heat very large and heavy components that cannot be placed on any fixed yoke system. For further detail on how MF induction heating handles large components, see our guide on induction heating for large rotors.
All EHF models support three inductor configurations, confirmed from the product pages:
Model: VIVID MF Quick-Heater EHF-22
Product page: 22kW Induction Heater
The 22kW EHF-22 handles bearings up to 100 kg and bolts M8–M20 — confirmed from the product page meta description. It is the entry point into the MF Quick-Heater range — suited to maintenance teams and workshops that handle smaller to medium-sized industrial bolts, flanges, and components not suitable for a yoke-based bearing heater. Its compact dimensions and portable design make it easy to deploy at the work location rather than bringing the component to the heater.
Best for: Smaller bolts (M8–M20), medium-weight components up to 100 kg, maintenance teams working in multiple locations, facilities new to MF induction heating.
Model: VIVID MF Quick-Heater EHF-33
Product page: 33kW Induction Heater
The 33kW EHF-33 sits at the mid-point of the MF Quick-Heater range. It delivers higher power output than the EHF-22, enabling faster heating cycles on medium-to-large components and greater capability on components at the upper end of the EHF-22’s range. For maintenance teams and workshops that frequently handle a wide variety of component sizes, the EHF-33 offers the most operational flexibility within the MF Quick-Heater family.
Best for: Mixed bolt and component heating across a wide size range, faster cycle times on medium components, general-purpose industrial heating for maintenance and fabrication.
Model: VIVID MF Quick-Heater EHF-44
Product page: 44kW Induction Heater
The 44kW EHF-44 is the highest-power model in the MF Quick-Heater range. Confirmed from the category page FAQ: for bolt removal applications, 22kW, 33kW, and 44kW induction heaters are optimal — with larger industrial bolts (M20–M48) benefitting from 33kW or 44kW systems. The EHF-44 is the correct choice for the heaviest bolt heating, largest flange preheating, large pipe end heating, and large rotor heating applications where maximum power output and the shortest possible heating cycle time are required.
Best for: Large bolts (M20–M48), heavy flanges and pipe ends, large rotor and shaft heating, applications where maximum power and shortest cycle time are the priority.
| Model | Series | Power | Max Component | Key Feature | Best For |
|---|---|---|---|---|---|
| EHS:4 | Bearing Heater | 3.5/4.0 KVA | Small–medium bearings; magnetic plates | Lightweight portable; Temp + Time mode; Raiser Blocks for larger bore | Small workshops; first induction heater; light bearing maintenance |
| EHS:8 | Bearing Heater | 6/8 KVA | 40–50 kg bearing to 100°C in 6–7 min | Roll-sliding yoke 80×80×490 mm; manual or automated | Motor repair shops; mid-range industrial bearings |
| EHS:16 | Bearing Heater | 11/16 KVA | 40–50 kg bearing to 100°C in 6–7 min; faster on heavy loads | Roll-sliding yoke 80×80×490 mm; manual or automated | Heavy maintenance; faster cycles; upper range of EHS:8 |
| EHML:25/40 | Bearing Heater | 25/40 KVA | Up to 700 kg bearing | Roll-sliding yoke 105×105×590 mm; ~300 kg unit; manual or automated | Power generation; wind energy; heavy industry; large rotor bearings |
| EHF-22 | MF Quick-Heater | 22 kW | Bearings up to 100 kg; bolts M8–M20 | Fixed or flexible inductor; heats any shape; compact and mobile | Bolt heating; flanges; portable field maintenance; mixed applications |
| EHF-33 | MF Quick-Heater | 33 kW | Medium–large components; mixed bolt range | Fixed or flexible inductor; highest operational flexibility in EHF range | General-purpose industrial heating; maintenance and fabrication |
| EHF-44 | MF Quick-Heater | 44 kW | Large bolts M20–M48; large rotors; heavy flanges | Maximum power; fastest cycle time in EHF range | Heavy industry; large bolts; wind turbines; pressure vessels; power plants |
This is the primary application for the EHS/EHML series. Heating expands the bearing bore so it slides onto the shaft without hammering or pressing — protecting the bearing’s internal geometry and extending its service life. The correct model depends on the weight of the bearing being regularly mounted.
For a detailed guide on the shrink fitting process, see our complete resource on induction heating shrink fitting.
The EHF MF Quick-Heater series is confirmed for dismounting — applying heat from outside the component to expand bearing rings, labyrinth rings, pipes, and rings for removal. Fixed inductor around the workpiece configuration is used for this application. Select the EHF model based on the size of the component to be dismounted.
The EHF MF Quick-Heater series is the confirmed product family for bolt heating. Flexible inductors are wound around the bolt body to heat and expand it for precise tensioning on flanged joints in pressure vessels, wind turbines, and heavy equipment. Bolt size guides the model selection:
For the full bolt removal application guide, see our blog on how to use induction heating for bolt removal.
The EHF MF Quick-Heater series handles flange preheating — bringing flanges to the required preheat temperature before welding, per ASME or AWS standards. The flexible inductor is wound around the flange body at the weld joint location. Select the EHF model based on the flange size and required preheat temperature: EHF-33 and EHF-44 for larger flanges.
The EHF MF Quick-Heater series is confirmed for pipe end heating before field welding on pipelines. The flexible inductor wraps around the pipe end at the joint location. EHF-33 and EHF-44 are suited to larger diameter pipes.
Both families can contribute to large rotor heating, but the EHML:25/40 and EHF-44 are the primary models for very large components. For applications involving large turbine or generator rotors, see our guide on induction heating for large rotors.
The EHS/EHML series covers shrink fitting of gears, couplings, and hubs on shafts — any component that can be placed on the yoke for heating. The EHML:25/40 covers very large gears and couplings. For non-yoke-compatible shapes, the EHF series with flexible inductor is the solution.
| Component / Specification | Recommended Model | Product Link |
|---|---|---|
| Small bearings; light shrink-fit components; magnetic plates | EHS/EHSU:4 | View Product |
| Bearings 40–50 kg; standard workshop bearing range | EHS/EHSU:8 | View Product |
| Bearings 40–50 kg; faster cycle time required | EHS/EHSU:16 | View Product |
| Large bearings up to 700 kg; large gears and couplings | EHML:25/40 | View Product |
| Bolts M8–M20; components up to 100 kg (any shape) | EHF-22 (22kW) | View Product |
| Mixed bolt range; medium–large flanges and pipes | EHF-33 (33kW) | View Product |
| Bolts M20–M48; large rotors; heavy flanges; maximum power | EHF-44 (44kW) | View Product |
Vivid Metrawatt’s induction heaters are trusted across 500+ industries globally. The following are confirmed from the product and category pages:
As confirmed on the Vivid Metrawatt website: larger bore diameter and heavier component = higher KVA needed for faster, uniform heating. Match the model to the heaviest bearing you regularly work with. EHS:4 for small and portable applications; EHS:8 and EHS:16 for bearings up to 40–50 kg (EHS:16 for faster cycle time); EHML:25/40 for bearings up to 700 kg. Contact Vivid Metrawatt’s team if unsure.
The EHS/EHML series is a yoke-based bearing heater — the component is placed on the machine’s electromagnetic yoke for heating. It is designed for bearing mounting, dismounting, and shrink fitting of components that can be placed on the yoke. The EHF MF Quick-Heater series uses a generator with fixed or flexible inductors — not a fixed yoke — and is designed for heating components of any size or shape in situ, including bolts, flanges, pipes, and large rotors. If your primary need is bearing mounting, start with the EHS/EHML series. If your primary need is bolt heating, flange preheating, or large component heating in the field, start with the EHF series.
Yes — all EHS/EHML series models feature automatic temperature control that monitors and cuts off heating once the target temperature is reached. This prevents overheating of bearings, which can alter their metallurgical properties. The EHS:4 confirmed intelligent microcontroller-based controls with Temperature mode and Time mode, both operable via feather touch keyboard.
Yes — automatic demagnetization is a confirmed feature of the Vivid Metrawatt induction heater range. After heating, the system removes residual magnetism from the component. This is critical for bearings: residual magnetism can attract ferrous particles during operation, leading to premature wear and failure.
Yes — this is one of the major advantages of the EHF MF Quick-Heater series, confirmed on the product pages. Flexible inductors can be wound around any size or shape of component, making it possible to heat very large and heavy components that cannot be placed on a fixed yoke. This applies to bolts, flanges, pipes, irregularly shaped castings, and large rotor or shaft assemblies.
Confirmed from product specifications and the category FAQ: the 22kW EHF-22 handles bearings up to 100 kg and bolts M8–M20. Larger industrial bolts (M20–M48) benefit from the 33kW EHF-33 or 44kW EHF-44 systems.
Induction heating is significantly safer than oil baths or open-flame heating. Key confirmed safety advantages: automatic temperature cutoff prevents overheating; automatic demagnetization; cool exterior casing — only the workpiece heats, not the machine; no open flame, no heated oil, no combustion risk. Standard PPE (heat-resistant gloves, safety glasses) is required for handling heated components.
Yes — custom solutions are confirmed available from Vivid Metrawatt, from specification to finished instrument. If your application or component size falls outside the standard model range, contact the Vivid Metrawatt team to discuss your requirements.
Find the Right Induction Heater for Your Application
Whether you need a portable bearing heater for a maintenance workshop or a 44kW MF Quick-Heater for large bolt and flange heating on site, Vivid Metrawatt’s range covers every requirement. Trusted by 500+ industries globally. CE certified. Custom solutions available. Contact the team for a recommendation matched to your exact application and component specification.
→ View EHS/EHSU:4 Bearing Induction Heater
→ View EHS/EHSU:8 Bearing Induction Heater
→ View EHS/EHSU:16 Bearing Induction Heater
→ View EHML:25/40 Bearing Induction Heater
→ View 22kW MF Quick-Heater (EHF-22)
→ View 33kW MF Quick-Heater (EHF-33)