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

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EXHEAT Offshore Portable Fan Heater ATEX

EXHEAT Offshore Portable Fan Heater ATEX

Offshore Portable Fan Heater | Zone 1 or Zone 2 (IIB+H2) or Zone 21 or Zone 22 (IIC)

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 Zone 1 & Zone 2 (Flammable Gas) and Zone 21 & Zone 22 (Dust) hazardous areas and explosive atmospheres according to ATEX Directive in 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


  • Authorised and certified for offshore applications/installations
  • T  Classes Available in T3 and T4 temperature classes for hazardous area zones
  • Temperature range – Suitable for ambient temperatures as low as 40ºC and up to +40°
  • Heater Power Rating – 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
  • Design – Fan heater 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
Wiring diagrams for single phase and three phase MFH heaters fitted with optional local isolator

Wiring diagrams for single phase and three phase MFH heaters fitted with optional local isolator

lease download EXHEAT MFH hazardous area fan heaters O&M manual for full details on installation and maintenance procedures – this includes wiring diagrams, earth connection and pre installation inspection and checks.

offshore portable fan heater


MFH ‘The Bulldog’ Offshore Portable Fan Heaters

MFH ‘The Bulldog’ Offshore Portable Fan Heaters | Dimensions


Hazardous Area CertificationsATEXEx II 2 G D Ex hEx db eb IIB+H2 T3…T4 GbEx tb IIIC T200°C…T135°C Db IP65IECExEx db eb IIB+H2 T3…T4 GbEx tb IIIC T200°C…T135°C Db IP65
1Ex db e IIB+H2 T3…T4 Gb XEx 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 EnclosureAnodised extruded aluminium
Ex e EnclosureStainless Steel
Motor HousingEpoxy coated aluminium
MountingAdjustable 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.
RatingUp to 6kW
Temp ClassAvailable in T3 and T4 temperature classes
VoltageSingle-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
MFH – 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.

Air Heaters | Immersion Heaters | Line Heaters | Thermostats | ATEX & IECEX Certified Electrical Heaters

T&D – Experts in Equipment for Explosive AtmospheresExplosive Atmospheres EX

Trust Thorne & Derrick to specify and supply from stock safe and reliable Heat, Light & Power Products for use in hazardous area locations and explosive atmospheres certified to international standards including ATEX and IECEx – this includes Zone 1 / Zone 2 (Flammable Gas) or Zone 21 / Zone 22 (Dusts) and Class I, Division 1 and Division 2 hazardous area requirements.

Since 1985 as Leaders in ATEX Innovation we can facilitate succession planning for the replacement of obsolete, non-conformant and legacy equipment – we are the provider of innovative solutions to ensure ATEX and IECEx Compliance for Electrical, HVAC & Process Instrumentation systems in the explosive atmosphere industries.