MHI GAXP® Heating Element Worksheet for Furnace Design

High Radiative Power With GAXP®.

If you know the furnace power please proceed directly to Element Calculators. If not please follow the steps below.

Steps for calculating the total length of MHI GAXP® heating elements for a new furnace.

Step 1.  Power Required.

Please size the furnace interior.  Now use the furnace calculator on GAXP® to determine how much power is required for the furnace at the maximum temperature..

Step 2.  Additional Power Required?

Make further power corrections if the planned furnace insulation is weak or a high heat -up rate is required. Adding about 50% more than calculated power in Step 1 may be ideal if the insulation is weak.

Step 3.  Determine the Shape and Size of Individual Heating Element

The Choices are Dumbbell, U- Shaped or Coil Shapes

U-shaped elements are hung from the furnace-roof or from the furnace sides. Dumbbell elements are used in a horizontal position inside a furnace.  Schematics of various configurations inside a box.  Coils may be hung from the roof.

furnace are shown below under step 5 in ‘More Resources’. Calculate the total GAXP® element heater length required by choosing a shape, sizing it to your furnace.

The calculator will also show the total power for the number of heating elements considered. Please ensure that the total power is at least equal to the Step 2 result.

Design for Dumbbell or U-Shaped GAXP® Heating Elements
Design for MagnaCoil™ Heating Elements

With each heating element one will need the ceramic holders (HW3) and connection straps BW200-C).

Element Design for Heater

Step 4. Electrical Connectors.

For electrical connectors please visit GAXP Element Connectors – U or Dumbbell Shape (or use Coil Accessory Packet for MagnaCoil heating elements).   Prices of connectors are also shown for each accessory pack.

Step 5. Tips.

The cold (terminal) section, Lu, should be at least a few inches larger than the insulation in order to connect your electric (braided wires) properly.  Connections must not get hot during use. Good furnace manufacturers use strong fans to keep the terminal area (electrical connections region) in a cold state.

Step 6.  Consult Resources.

Contact MHI for a final check.  MHI can provide advise on the control system you may need (BPAN, XPAN or TRIPAN). BPAN prices are listed in the MHI store. When purchasing a control panel please ensure features like soft start and current limits.  Please use a power transformer that matches the voltage of the furnace.   MHI can also provide a certification-logo for the furnace.

Use GAXP® heating elements

Calculator for power required to maintain any furnace volume at a given temperature

U shape GAXP

Power per element Calculator



GAXP Glow Panel

GAXP®  Plate Heaters 1400°C


Request a quote for Coil Heating Elements

Power Calculator for Coils

 Straight Microheaters
More Choices

IR Heater

IR Bulbs

  1. Nanostructured element. Patented material from a well-respected supplier in business for twenty years.
  2. Typical shapes: Hairpin shape (same as U-shaped), Dumbbell (same as straight) or Coil. (See schematics pictured below).
  3. For use in air (oxidation) carbon (reducing), neutral or combustion atmosphere. (The GAXP® is a patent protected technology product).

For temperatures < 1000°C use of the Dumbbell shape is allowed. For tempeartures over 1000°C use U shaped. For coils contact MHI for assistance.  Coils may be used for any temperature.

GAXP® heating elements are considered for change-out in many SiC heaters especially  where a higher element life and modern controls are required.  MHI warrants its GAXP heating elements.

Picture shows a schematic of the use of U-shaped, dumbbell-shaped and flat coil-shape heating elements inside a box-furnace interior. Request a quote for U-Shaped GAXP® Heating Elements Request a quote for Coil Heating Elements Power Calculator for Coils

*Furnaces should be constructed only by experienced furnace maker. Please observer all safety rules/practices commonly associated with high temperature, high voltage, high current. Always please use only industry approved insulation.    Please use high temperature safety