High Uniformity G-Robust Radiators (GRR) and Hot-Sleeves for 1250°C/1300°C User Applications

Design a GRR Robust Radiator heater with this calculator

Multi-zone capable. Each GRR unit is provided with non-toxic ceramic insulator shell.  Uniquely made with patented nano-material content.

Please contact MHI for dimensions of GRR units or use the table below.  Use with DC or AC current (50/60 Hz).

GRR Model ID (in) L (in) (add 2" for total length) Power (kW) (Nominal) Control Panel Volts**
GRR1(3)-110 1 3 1 IBPAN-110 115/120
GRR2(2)-120 2 2 1.4 IBPAN-110 110120
GRR2(4)-220 2 4 2.5 IBPAN-220 220/230
GRR2(10)-220 2 10 6 IBPAN-220 220/230
GRR 2(8)-220 2 8 5 IBPAN-220 220/230
GRR 3(5)-220 3 5 3 IBPAN-220 220/230
GRR 4.5(2)-220 4.5 2 3 IBPAN-220 220/230/240
GRR 6.3(2)-220 6.3 2 4.2 IBPAN-220 220/230/240

GRR High Uniformity Robust Radiators may be used to approximately 1300°C.
For temperatures higher than 1300°C for the Robust Radiator, please click on Robust Radiators.

Provide the ID and desired length of your heated zone to calculate the maximum power below for GRR™ Robust Radiator.

 Heated Zone ID:
Heated Zone Length:
GRR Power:

GA-XP CoilGRR Robust Radiator with Stainles Steel Enclosure

Schematic of Heated Zone ID and L

** Plug-in voltage indicates closest IBPAN preference. The GRR unit-temperature, the element maximum-temperature, the rated amperage (current) or power, cannot be exceeded in any configuration of use.  The configuration of use will change with end caps, load, flow, placement of control thermocouple and extent of insulation that is ordered.  If not puchasing a MHI control system with the GRR unit/model or if choosing multiple units, please confirm the RR volts of the unit with the sales agent.

Sleeve Heaters

High Temperature Sleeve Heater

Use for individual zone heaters in zone refining operations

Sleeve Heater

Model #

Max Power (Watts) Heated Length (A) Overall Length (B) ID (C) OD (D)
SLH-1.5 350 0.25 in 2 in 1.5 in 5 in
SLH-3.0 800 0.25 in 2 in 3 in 6.5 in


MHI Contact Us

Unlimited Power with Multiple Zones

  • High power density
  • Volume pricing
  • Non-toxic fiber-free enclosure
  • Match to your line voltage if required
  • Full line of electronic controls available
  • Rapid Delivery

Live Customer Support by phone (513-772-0404) or email. . Typical single and Multi-zone configurations are shown below. Terminal connectors are shown for each-zone.  End-caps and all other accessories available - see section on Robust Radiators.

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Connects to the MHI Store

Micro RR
GRR™ Micro Coil Robust Radiator


Multi Zone Stacked GRR modules. 6 Stack Module.


  • Click link above for:
  • Details of Applications
  • Power Calculator above
  • RF/MW applications
  • Non toxic substrates