Trusted HVAC Experts SINCE 2014
Indirect Space Heaters
Our selection of indirect space heaters are designed to deliver fast, clean heat to large spaces. Ideal for use across a variety of industries.
Thermobile
Medium Space Heater Package (Thermobile Indirect)
- 24.8 / 45 / 70kW Portable Indirect Heater
- Multiple Accessories Included
- Integrated Thermostat Control
- Runs on Diesel or Kerosene
- Heats Separate Spaces Simultaneously
- Great Value Package Deal
Thermobile
Large Space Heater Package (Thermobile Indirect)
- 45kW / 70kW Portable Indirect Heater
- Multiple Accessories Included
- Integrated Thermostat Control
- Runs on Diesel or Kerosene
- Heats Separate Spaces Simultaneously
- Great Value Package Deal
Arcotherm
Arcotherm Jumbo 85M Indirect Oil Fired Space Heater - 240v 79kW
- 269,706 BTU/hr Powerful Portable Indirect Heat
- Runs on Diesel, Kerosene or Biodiesel
- 7200m³/h Huge Airflow
- Flue, Thermostat & Ducting Accessories Available
- Ideal For Warehouses, Factories & Construction
- Create Your Own Package
Arcotherm
Arcotherm Package Jumbo 85M Indirect Oil Fired Space Heater - 240v 79kW
- Complete heating solution – all essential components in one package
- Includes Arcotherm Jumbo 85M indirect oil fired heater, Ecoflam diesel burner, Jumbo Tigerloop, 450 mm one-way ducting adaptor, flue pipe, rain cowl & heavy-duty thermostat with 10 m lead
- Powerful 79 kW Arcotherm Jumbo 85M indirect oil fired heater
- Delivers 269,600 BTU/hr with 7,200 m³/h airflow for large areas
- Dual voltage 230/110 V for flexible site use
- Runs on diesel, kerosene or biodiesel
- Free service kit worth £65
Arcotherm
Arcotherm Jumbo 110M Indirect Oil Fired Space Heater - 240v 102kW
- 348,228 BTU/hr Powerful Portable Indirect Heat
- Runs on Diesel, Kerosene or Biodiesel
- 9000m³/h Huge Airflow
- Flue, Thermostat & Ducting Accessories Available
- Ideal For Warehouses, Factories & Construction
- Create Your Own Package
Arcotherm
Arcotherm Jumbo 145M Indirect Oil Fired Space Heater - 240v 137kW
- 467,718 BTU/hr Powerful Portable Indirect Heat
- Runs on Diesel, Kerosene or Biodiesel
- 12,000m³/h Huge Airflow
- Flue, Thermostat & Ducting Accessories Available
- Ideal For Warehouses, Factories & Construction
- Create Your Own Package
Arcotherm
Arcotherm Package Jumbo 145M Indirect Oil Fired Space Heater - 240v 137kW
- Complete heating solution – all essential components in one package
- Includes Arcotherm Jumbo 145M indirect oil fired heater, Ecoflam diesel burner, Jumbo Tigerloop, 450 mm one-way ducting adaptor, flue pipe, rain cowl & heavy-duty thermostat with 10 m lead
- Powerful 137 kW output with 12,000 m³/h airflow for large commercial & industrial spaces
- 46,7463 BTU/hr heating capacity and 94% efficiency for fast heat delivery
- Dual voltage 230/110 V operation for versatile site use
- Runs on diesel, kerosene or biodiesel
- Free service kit worth £65
Arcotherm
Arcotherm Jumbo 185M Indirect Oil Fired Space Heater - 240v 170kW
- 580,380 BTU/hr Powerful Portable Indirect Heat
- Runs on Diesel, Kerosene or Biodiesel
- 13,000m³/h Huge Airflow
- Flue, Thermostat & Ducting Accessories Available
- Ideal For Warehouses, Factories & Construction
- Create Your Own Package
Arcotherm
Arcotherm Package Jumbo 185M Indirect Oil Fired Space Heater - 240v 170kW
- Fully equipped heating package – designed for large-scale performance
- Includes Arcotherm Jumbo 185M indirect oil fired heater, Ecoflam diesel burner, Jumbo Tigerloop, 450 mm one-way ducting adaptor, flue pipe, rain cowl & heavy-duty thermostat with 10 m lead
- Powerful 170 kW output with 13,000 m³/h airflow for large commercial & industrial areas
- 580,064 BTU/hr heating capacity with 92–93% efficiency
- Runs on diesel, kerosene or biodiesel
- Robust design with high-quality 7-blade fan
- Free service kit worth £65
Arcotherm
Arcotherm Jumbo 235M Indirect Oil Fired Space Heater - 240v 218kW
- 743,846 BTU/hr Powerful Portable Indirect Heat
- Runs on Diesel, Kerosene or Biodiesel
- 17,000m³/h Huge Airflow
- Flue, Thermostat,Tigerloop & Ducting Accessories Available
- Ideal For Warehouses, Factories & Construction
- Create Your Own Package
Arcotherm
Arcotherm Package Jumbo 235M Indirect Oil Fired Space Heater - 240v 218kW
- Fully equipped heating package – engineered for large-scale performance
- Includes Arcotherm Jumbo 235M indirect oil fired heater, Ecoflam diesel burner, Jumbo Tigerloop, 450 mm one-way ducting adaptor, flue pipe, rain cowl & heavy-duty thermostat with 10 m lead
- 218 kW output with 17,000 m³/h airflow for large commercial & industrial areas
- Runs on diesel, kerosene or biodiesel
- Robust design with high-quality 7-blade fan
- Free service kit worth £65
Thermobile
Thermobile IMA 61 AX / IMA 61 RAD Indirect Oil Fired Heater - 230v 65kW
- 221,910 BTU/hr Portable Indirect Heat
- Runs on Diesel or Kerosene with External Tank
- 4000m³/h Airflow
- Flue, Thermostat & Ducting Accessories Available
- Ideal For Construction, Warehouses, Factories & More
- Choice Of High Pressure Internal Fans Available
Thermobile
Thermobile IMA 65 EC - Indirect Space Heater - 240v 65kW
- 221,910 BTU/hr Portable Indirect Heat
- Runs on Diesel or Kerosene with External Tank
- Duct Warmth Over Long Distances
- Flue, Thermostat & Ducting Accessories Available
- Ideal For Construction, Warehouses, Factories & More
- Fan-Only Mode & Tigerloop Included
Thermobile
Thermobile IMA 111 - Indirect Space Heaters - 230v/400v 110kW
- 375,540 BTU/hr Powerful Portable Indirect Heat
- Runs on Diesel or Kerosene with External Tank
- Duct Warmth Over Long Distances
- Flue, Thermostat & Ducting Accessories Available
- Ideal For Construction, Warehouses, Factories & More
- Choice Of Internal Fans & Voltages Available
Thermobile
Thermobile IMA 150 - Indirect Space Heaters - 230v/400v 150kW
- 512,000 BTU/hr Portable Indirect Heat
- Runs on Diesel or Kerosene with External Tank
- Duct Warmth Over Long Distances
- Flue, Thermostat & Ducting Accessories Available
- Ideal For Construction, Warehouses, Factories & More
- Choice Of High Pressure Internal Fans Available
Thermobile
Thermobile IMA 200 - Indirect Space Heaters - 230v/400v 200kW
- 682,800 BTU/hr PowerfulPortable Indirect Heat
- Runs on Diesel or Kerosene with External Tank
- Duct Warmth Over Long Distances
- Flue, Thermostat & Ducting Accessories Available
- Ideal For Construction, Warehouses, Factories & More
- Choice Of High Pressure Internal Fans Available
Master Climate Solutions
Master BV 310FS Airbus - Jumbo Indirect Oil Fired Space Heater - 240v 75kW
- 256,000 BTU/hr Portable Indirect Heat
- Runs on Diesel or Kerosene
- 4400m³/h Airflow
- Flue, Thermostat & Ducting Available As Accessories
- Ducting Connection for Directing Warmth
- Ideal For Warehouses, Construction & Events
Master Climate Solutions
Master BV 471 FS Airbus - Jumbo Indirect Oil Fired Space Heater - 240v 136kW
- 464,300 BTU/hr Portable Indirect Heat
- Runs on Diesel or Kerosene
- 8500m³/h High Pressure Airflow
- Ducting Connection for Directing Heat
- Ideal For Construction, Warehouses & Events
- Unique ‘Cold Start’ Feature
Master Climate Solutions
Master BV 691 FS Airbus - Jumbo Indirect Oil Fired Space Heater - 240v 225kW
- 68,150 BTU/hr Powerful Portable Indirect Heat
- Runs on Diesel or Kerosene
- 12,800m³/h Huge Airflow
- Ducting Connection for Directing Warmth
- Flue, Thermostat & Ducting Accessories Available
- Unique ‘Cold Start’ Feature
Arcotherm
Arcotherm Titan 185T Indirect Combustion Heavy Duty Space Heater 185kW - 235kW
- 63,1246 BTU/hr Portable Indirect Heat
- Runs on Automatic Oil or Natural/LPG Gas
- 16,000m³/h Airflow
- IP55 Rating & Robust Metal Safety Cover
- Reinforcement Cross Pleat Removable Panels
- NEW Heat Exchanger 96% Efficiency
Safe, Clean Heat With An Indirect Space Heater
Indirect oil fired space heaters are designed to deliver safe, temporary heat to large areas. These units are the ideal solution for industrial, commercial and construction environments.
Indirect space heaters are versatile and have a wide range of applications, from being commonly used on construction sites, to use in marquees, warehouses, event spaces and sometimes used to assist in pest control heat treatment.
Indirect oil fired space heaters are portable units that are designed to sit on the outside of a premises and feature ducting which vents the warm, clean air produced by the unit into the desired area. Heat is produced by passing air over an open flame within the unit, where the fumes are expelled and the clean air safely ducted away from the device.
Make sure not to get confused with direct oil fired space units, as direct space heaters are designed to be operational within large, well ventilated space as they do not get ducted. Read more about the differences between both direct and indirect fired space heaters.
Robust Indirect Heaters From Trusted Brands
At National Heater Shops, we have a wide range of units from a selection of trusted and reliable brands and manufacturers such as Arcotherm, Thermobile, Master and Sealey amongst others. These units are robust and created with safety, efficiency and effectiveness in mind.
Many models feature large tanks, and can be used with extra fuel tanks to prolong run times. They are also scalable, meaning multiple units can be used at once providing the infrastructure is available to accommodate, and they can be used in tandem alongside other heaters such as electric fan heaters or infrared heaters.
Choosing The Correct Indirect Fired Space Heater
When choosing which indirect heater is best for you, there are a few things to consider, including:
Fuel availability
Portability
Where the unit will sit and where the ducting will lead
Kw/BTU requirements
Heat output requirements
Operation times
Ventilation
If you are still undecided on which heater best suits your needs, contact us or speak to our friendly sales team.
Additionally, use our heating calculator to help decide on the size and heat output of the unit needed for your space.
At National Heater Shops, we also sell complete kits such as the Medium Space Heater Package (Arcotherm Indirect) which include ducting, a flue and rain cowl.
Indirect Oil Fired Space Heater FAQs
What fuel do indirect fired space heaters use?
We have options available for indirect heaters that require diesel, kerosene, gas, natural/LPG gas, biodiesel, automatic oil or HVO.
Which industries commonly use indirect space heaters?
Indirect space heaters are used across a multitude of industries, including construction, manufacturing, warehousing, agriculture, events, and emergency response applications.
When should I use an indirect diesel space heater?
These units are recommended whenever people are working within the heated area or when air quality must be maintained. They are best used in enclosed spaces that are poorly ventilated, where their direct counterparts cannot be used safely.
Can indirect heaters be connected to ducting?
A vast majority of indirect space heaters are designed for use alongside ducting, as the safe, clean warm air needs to be filtered and directed towards the intended area. You can browse our selection of packages or ducting to find options for this ducting.