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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.
Arcotherm
Arcotherm BH Suspended Indirect Fired Space Heaters 44kW - 89kW
- 44.4kW - 89kW Indirect Heat
- Runs on Automatic Oil or Natural/LPG Gas Separate Burner
- IP65 Electric Board Grade Protection
- Stainless-Steel Body & Combustion Chamber
- Summer/Winter Switch
- Diverse Control Safety Features
Flexel
Flexel Ecosun S+ High Output Radiant Space Heater Series 900W - 3600W
- 900W-3600W High-Output Range
- 230v Mains Supply
- Ceiling or Wall-Mount Installation Options
- Slim Powder-Coated Steel Casing
- Aluminium Profile with Silicated Surface
- No Light. No Noise. No Fumes.
Powrmatic
Powrmatic OUH Oil Fired Heater 45kW
- Downward firing high/low-pressure jet burner
- Output range: 20kW to 60kW
- Suspended indirect oil-fired heater
- Standard stainless steel heat exchanger
- Free-blowing axial or ducted centrifugal fan
Powrmatic
Powrmatic OUH Oil Fired Heater 60kW
- 20kW to 60kW output models
- Free-blowing axial or ducted centrifugal
- Indirect oil-fired suspended heater
- 304-grade stainless steel heat exchanger
- High/low-pressure jet burner
Powrmatic
Powrmatic OUH Oil Fired Heater 30kW
- Models from 20kW to 60kW
- Axial or centrifugal fan options
- Stainless steel heat exchanger standard
- High/low-pressure jet burner
- Suspended indirect oil-fired heater
Master Climate Solutions
Master BV 290 Indirect Oil Fired Space Heater - Dual Voltage 81kW
- 276,000 BTU/hr Portable Indirect Heat
- Runs on Diesel, Kerosene and HVO
- 3300m³/h Airflow
- Robust Design & Quality Components
- Flue, Thermostat & Cover Available As Accessories
- Duct Warmth To Marquees, Workshops & Events
Arcotherm
Small Space Heater Package (Arcotherm EC22 Indirect)
- 19kW Portable Indirect Heater
- Ducting, Rain Cowl & More Included
- Runs on Diesel or Kerosene
- Integrated Thermostat Control
- Perfect For Enclosed Spaces
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
Master Climate Solutions
Master BV 500CR Indirect Oil Fired Space Heater - 240v 150kW
- 512,000 BTU/hr Portable Indirect Heat
- Runs on Diesel or Kerosene
- 5000m³/h Airflow
- Ducting Connection for Directing Warmth
- Flue, Thermostat & Ducting Accessories Available
- Ideal for Construction, Warehouses & Events
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.