ATEX Fan Heaters – Offshore Portable Fan Heater – EXHEAT MFH “The Bulldog”

EXHEAT Offshore Portable Fan Heater ATEX

EXHEAT Offshore Portable Fan Heater ATEX

ofFshore portable fan Heaters

atex certified

EXHEAT MFH “Bulldog” offshore portable flameproof fan heaters provide safe portable, hazardous area certified heating and air warming for offshore hazardous areas.

The Bulldog offshore portable fan heater is the world’s first truly portable hazardous area fan assisted heater. The ATEX heaters feature a patented design (GB1614657.3) which utilises salt-water resistant materials to provide a portable heating solution for use in offshore environments where the potentially explosive atmosphere is classified as hazardous area Zone 1 or Zone 2 (IIB+H2) or Zone 21 or Zone 22 (IIC).

Offshore “Bulldog” flameproof fan heaters are certified to meet ATEX equipment directive and are tough and durable with a casing made from steel reinforced polymer. The unit has adjustable feet allowing for the heater to be angled into position and the compact design means it can be easily stored or transported.

Typical heating applications include offshore containers, production platforms, paint curing and stores, spray booths, oil refineries and drilling and fabric maintenance.

The Offshore “Bulldog” can be used with or without ducting to provide a warm stream of air that can be felt up to five metres away, in ambient temperatures as low as -40°C or as high as +40°C.

The hazardous area portable fan heater comes ready to plug and play with the option of fitting a plug, or hard wiring to an isolator unit and can be optionally fitted with an additional safety device above and beyond the requirements of the certification.

The bulldog offshore portable fan heater


  • Authorized and certified for offshore applications/installations
  • Available in T3 and T4 temperature classes for hazardous area zones
  • Suitable for ambient temperatures as low as 40ºC and up to +40°
  • Up to 6kW. The heater can be directed at an engineer working in a larger space, or at the same time, warm a mid sized room to a comfortable operating temperature for all within
  • Offshore design includes a standard local isolator, anti-static castors and two side handles
  • Portable and lightweight, allowing for single user manipulation / operation. Can be supplied on a long flying lead to get heat where you need it
  • The Bulldog’s design increases efficiency, providing a warmer flow of air for the operator at up to 5 metres

offshore portable fan heater


MFH ‘The Bulldog’ Offshore Portable Fan Heaters

MFH ‘The Bulldog’ Offshore Portable Fan Heaters | Dimensions


Hazardous Area CertificationsATEX
Ex II 2 G D Ex h
Ex db eb IIB+H2 T3…T4 Gb
Ex tb IIIC T200°C…T135°C Db IP65
Ex db eb IIB+H2 T3…T4 Gb
Ex tb IIIC T200°C…T135°C Db IP65
1Ex db e IIB+H2 T3…T4 Gb X
Ex tb IIIC T200°C…T135°C Db X
Approval Upcoming
MeasurementsLength – 475 x Width – 470 x Height – 530 mm
Base Weight28 kg
Main Materials
CasingPA66 30% with EMI shielding
CablingBS6883 certified, salt resistant and suitable for marine use
ImpellerPA66 30% with EMI shielding with epoxy coated aluminium hub
ElementsFinned Stainless Steel tubular elements
Ex d Enclosure
Anodised extruded aluminium
Ex e Enclosure
Stainless Steel
Motor Housing
Epoxy coated aluminium
Adjustable feet at each corner allow for a stable standing on uneven surfaces. Wall mounting bracket option available (will require remote isolator for heater access/operation). Anti-static castors available.
Up to 6kW
Temp Class
Available in T3 and T4 temperature classes
Single-Phase: 110V to 277V
Three-Phase: 380V to 690V, 50/60Hz
Offshore Substations

Providing comfortable workspace heating in offshore substations.

EXHEAT MFH offshore portable Fan Heater

Product Range

Fan heater suitable for hazardous area Zone 1 & Zone 2 (IIB, IIC) gas groups.

EXHEAT ModelVoltage (*)Phase (**)Nominal Output (kW)Air flow (m³/hr)Air Temp. Delta (°C/°F) (***)Max Current (A) (****)
50 Hz60 Hz50 Hz60 Hz
MFH – T3 Class
MFH-5.5-22022015.51050126016.2 / 29.213.5 / 24.325.6
MFH-6-230230617.7 / 31.814.7 / 26.526.7
MFH-5.5-2402405.516.2 / 29.213.5 / 24.323.5
MFH-6-254254617.7 / 31.814.7 / 26.524.2
MFH-6-277277617.7 / 31.814.7 / 26.522.3
MFH-5.5-38038035.516.2 / 29.213.5 / 24.39.0
MFH-6-400400617.7 / 31.814.7 / 26.59.3
MFH-5.5-4154155.516.2 / 29.213.5 / 24.38.3
MFH-6-440440617.7 / 31.814.7 / 26.58.5
MFH-6-480480617.7 / 31.814.7 / 26.57.8
MFH-6-600600617.7 / 31.814.7 / 26.56.4
MFH-6-690690617.7 / 31.814.7 / 26.55.6
MF- T4 Class
MFH-2.5-11011012.5105012607.4 / 13.323.3
MFH-3-12012038.8 / 15.925.6
MFH-2.75-2202202.758.1 / 14.613.1
MFH-3-23023038.8 / 15.913.6
MFH-2.75-2402402.758.1 / 14.612.1
MFH-3-25425438.8 / 15.912.4
MFH-3-27727738.8 / 15.911.4
MFH-2.75-38038032.758.1 / 14.64.8
MFH-3-40040038.8 / 15.94.9
MFH-2.75-4154152.758.1 / 14.64.4
MFH-3-44044038.8 / 15.94.6
MFH-3-48048038.8 / 15.94.3
MFH-3.7-6006003.710.9 / 19.64.2
MFH-3.7-6906903.710.9 / 19.63.7
* Voltage tolerance +0/-10%.
** Minimum SWA multicore cables required: 3Ph 380V–690V heaters require 4mm², 1Ph 220V-277V T4 heaters require 4mm², 110V-120V T4 & 220V-277V T3 heaters require 6mm², 110V-120V T3 heaters require 10mm².
*** ΔT (Delta T) refers to the air temperature difference at the inlet and outlet. For example, if the ambient is +6°C and the ΔT (temperature rise) is 15°C, then the outlet will be +21°C.
**** The maximum current includes the maximum motor inrush.
All values based on 25m cable lengths and an acceptable voltage drop of 4% at +40°C ambient.
Hazardous Area Portable Fan Heaters - Zone 1 Zone 2

EXHEAT MFH Portable ATEX Fan Heater: The world’s first truly portable hazardous area fan assisted heater for hazardous area location heating.

EXHEAT Electrical Heaters - Hazardous Area Zone 1 Zone 2 ATEX

EXHEAT Heaters: temperature maintenance, space heating and air warming for enclosures, cabinets, rooms and stores in hazardous area locations. Flameproof heaters can be certified for use in Zone 1 & Zone 2 or Zone 21 & Zone 22 hazardous areas.


Thorne & Derrick International distribute Electrical, Mechanical, Process & Instrumentation Equipment to the global hazardous area industries and are approved vendors to most leading oil, gas and petrochemical companies and their EPC’s.

T&D supply ATEX & IECEx Certified equipment for the detection, metering, flow measurement and heat tracing of potentially explosive gases in hazardous areas Zone 1 and Zone 2.

Hazardous Area - Gas Detection, Metering, Lighting & Flow Measurement


➡ Did you know? T&D have a dedicated Exports and Hazardous Area Sales Team, send an enquiry.

➡ Did you know? T&D are Thermon, The Heat Tracing Specialists, largest UK stockist.

➡ Did you know? T&D are Trained by Crowcon in the specification and sale of Gas Detectors.