Trusted HVAC Experts SINCE 2014
Indirect Space Heaters
Indirect oil fired space heaters provide large volumes of 100% clean, fume-free warm air. This makes them ideal for heating indoor, enclosed and poorly ventilated areas safely and effectively, such as enclosed workshops, halls, marquees, and other areas where there are people and animals.
Sealey
Sealey ABI1000 Indirect Oil Fired Space Heater - 230v 30kW
- 102,000 BTU/hr Portable Indirect Heat
- Runs on Diesel or Kerosene
- 780m³/hr Airflow
- 100% Clean, Dry, Odourless Heat
- Fan Cooling Function & Integrated Thermostat
- Hybrid Indoor/Outdoor Heater
Arcotherm
Arcotherm EC22 Indirect Oil Fired Space Heater - 240v/110v 19kW
- 64,800 BTU/hr Portable Indirect Heat
- 550m³/h Airflow
- Overheat Safety Thermostat
- AISI 430 Stainless-Steel Combustion Chamber
- Flue, Thermostat & Ducting Accessories Available
- Ducting Connection for Directing Warmth
Arcotherm
Arcotherm EC32 Indirect Oil Fired Space Heater - Dual Voltage 29kW
- 99,000 BTU/hr Portable Indirect Heat
- 42 Litre Fuel Tank
- 1150m³/hr Airflow
- Ducting Connection for Directing Warmth
- High-Quality Features for Safe & Reliable Performance
- Popular in Marquee Hire & Live Events
Arcotherm
Arcotherm EC55 Indirect Oil Fired Space Heater - Dual Voltage 51kW
- 174,000 BTU/hr Portable Indirect Heat
- 65 Litre Fuel Tank
- 2500m³/hr Airflow
- Flue, Thermostat & Ducting Available
- Best Indirect Heater Award 2023
Arcotherm
Arcotherm EC85 Indirect Oil Fired Space Heater - Dual Voltage 81kW
- 276,000 BTU/hr Portable Indirect Heat
- 105 Litre Fuel Tank
- 4300m³/hr Airflow
- Flue, Thermostat & Ducting Accessories Available
- For Marquees, Warehouses, Events
Arcotherm
Arcotherm Phoen 110 Indirect Oil Fired Space Heater - 230v/110v 106kW
- 361,000 BTU/hr Portable Indirect Heat
- Runs on Diesel, Kerosene or Biodiesel
- 5,300m³/h Airflow
- Ducting Connection for Directing Warmth
- Flue, Thermostat & Ducting Accessories Available
- Fan-Only Mode
Master Climate Solutions
Master BV 77 Indirect Oil Fired Space Heater - Dual Voltage 20kW
- 68,000 BTU/hr Portable Indirect Heat
- Runs on Diesel, Kerosene or HVO
- 1500m³/h Airflow
- 36 Litre Fuel Tank
- Flue, Thermostat & Cover Accessories Available
- Duct Warmth To Marquees, Workshops & Events
Master Climate Solutions
Master BV 110 Indirect Oil Fired Space Heater - 240v 34kW
- 116,000 BTU/hr Portable Indirect Heat
- Runs on Diesel, Kerosene or HVO
- 1800m³/h Airflow
- Robust & Resilient Design
- Flue, Thermostat & Cover Accessories Available
- Duct Warmth Into Marquees, Workshops & More
Master Climate Solutions
Master BV 170 Indirect Oil Fired Space Heater - Dual Voltage 47kW
- 160,000 BTU/hr Portable Indirect Heat
- Runs on Diesel, Kerosene and HVO
- 1800m³/h Airflow
- Robust Design & Quality Features
- Flue, Thermostat & Cover Available As Accessories
- Duct Warmth To Marquees, Workshops & More
Master Climate Solutions
Master BV 400 Indirect Oil Fired Space Heater - 240v 110kW
- 375,540 BTU/hr Powerful Portable Indirect Heat
- Runs on Diesel or Kerosene
- 6200m³/h Airflow
- Ducting Connection for Directing Warmth
- Flue, Thermostat & Ducting Accessories Available
- Ideal For Warehouses, Construction & Events
Thermobile
Thermobile ITA 35 Indirect Fired Space Heater - 110v/240v 24kW
- 81,900 BTU/hr Portable Indirect Heat
- Runs on Diesel or Kerosene
- 1500m³/h Airflow
- Overheat Safety Thermostat
- Flue, Thermostat & Ducting Accessories Available
- Ideal for Marquees, Workshops & Events
Thermobile
Thermobile ITA 45 Indirect Fired Space Heater - 110v/240v 45kW
- 153,630 BTU/hr Portable Indirect Heat
- Runs on Diesel or Kerosene
- 3000m³/h Airflow
- Flue, Thermostat & Ducting Accessories Available
- Ideal For Marquees, Workshops, Construction & Events
- Ultra Robust Model Available
Thermobile
Thermobile ITA 75 Indirect Fired Space Heaters - 110v/240v 70kW
- 238,980 BTU/hr Portable Indirect Heat
- Runs on Diesel or Kerosene
- 3800m³/h Airflow
- Flue, Thermostat & Ducting Accessories Available
- Ideal For Warehouses, Construction, Marquees & Events
- Ultra Robust Model Available
Master Climate Solutions
Small Space Heater Package (Master Indirect)
- 68,280BTU/hr Portable Indirect Heater
- Great Value Package Deal
- Optional Rain Cover & Thermostat
- Runs on Diesel, Kerosene or HVO
- Ideal For Small Workshops & Marquees
- Dual Voltage
Master Climate Solutions
Medium Space Heater Package (Master Indirect)
- 34 / 49 / 85kW Master Indirect Heater
- Great Value Package Deal
- Optional Rain Cover & Thermostat
- Runs on Diesel, Kerosene and HVO
- Ideal Solution For Marquees
Master Climate Solutions
Large Space Heater Package (Master Indirect)
- 34 / 49 / 85kW Master Indirect Heater
- Great Value Package Deal
- Optional Rain Cover & Thermostat
- Runs on Diesel, Kerosene and HVO
- Can Heat Separate Spaces Simultaneously
Arcotherm
Medium Space Heater Package (Arcotherm Indirect)
- 29 / 51 / 81kW Portable Indirect Heater
- Standard & Low Level Diffusers
- Diesel, Kerosene or Heating Oil
- Integrated Thermostat Control
- Perfect For Enclosed Spaces
Arcotherm
Large Space Heater Package (Arcotherm Indirect)
- 51kW or 81kW Arcotherm Indirect Heater
- Standard & Low Level Diffusers
- Dual Voltage Selector Switch
- Heats Two Spaces Simultaneously
- Great Solution For Marquees
Arcotherm
Extra Large Space Heater Package (Arcotherm Phoen 110)
- Everything you need in one package - saving you money!
- 361,000BTU/hr Portable Arcotherm Phoen 110 indirect oil fired space heater
- 1x Ducting Adaptor
- 1x Ducting and Splitter Combination of Your Choice
- 1x Thermostat c/w 10m Lead
- 1x Flue Pipe
- 1x Rain Cowl
FREE Delivery (Mainland UK)
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
Indirect Space Heaters
Portable heaters for enclosed spaces
Indirect fired space heaters are designed for heating enclosed, indoor, and poorly ventilated spaces. They produce only clean, fume-free & dry warm air, so they can be used for heating halls, marquees, galas, event tents, workshops, farmhouses, and a range of other indoors spaces safely.
These heaters can be fuelled using diesel, heating oil, paraffin or kerosene. The flame burns inside a combustion chamber and warms a heat exchanger. A fan at the back of the unit draws air in and passes it around the heat exchanger. The temperature of the air rises as it blows over the heat exchanger. The clean warm air blows out of the front of the heater while fumes are expelled out of the top of the unit through the flue.
These portable heaters can be placed outside the area you want to heat, and the clean, warm air can be ducted inside through flexible hoses. They can also be used as a more permanent heater, by placing the unit indoors and installing a flue to exhaust the fumes outside through a wall or roof.
Indirect oil fiired heaters are highly versatile. As the warm air is 100% clean and safe, you can use them in sensitive areas, such as food processing factories, oil refineries, foundries, or storage centres. With the output warm air also being dry, you can use them for drying applications and frost protection. They work extremely well with industrial fans and dehumidifiers. If you need a more efficient source of heat and have a well-ventilated space like construction sites, a direct diesel space heater might be a better match.
National Heater Shops has an extensive selection of indirect-fired diesel space heaters from trusted brands such as Master, Arcotherm, Heylo, and Thermobile. So, whether you need to heat a small workshop or large barn, we can find the perfect product for your needs. Many models feature large internal tanks, and can also be used with extra fuel tanks to prolong run times. We have also created a range of heater package deals which include everything you need to get started right away, including free delivery to mainland UK.