About heaters

Hipers and Weltem infrared heaters with a fuel burner are the best on the market

There is no need for a separate flue tube or ventilation pipeline when you use Hipers or Weltem heaters in indoor areas, such as halls, garages, PVC tents, storage halls for heavy equipment, or even churches. The heater does not emit any smell or smoke.

Either regular diesel or biodiesel can be used as fuel.

Diesel-powered heaters have extremely low maintenance costs. When working at maximum power, the heater uses a little over one litre of fuel per hour. If the heated area is, for example, a normally insulated 500 m2 room, and the outdoor temperature is +0 °C and the desired indoor temperature is +15, then the heater consumes 2-3 litres of fuel per day. Heaters with average power consume 3-4 litres of fuel per day, and the most powerful heaters consume 4-5 litres of fuel per day.

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The infrared heater does not have a fan. The heat spreads around the room by way of radiating from the heater and then transfers on to materials. The materials and the items in the room heat up and reflect the thermal energy back to the room. Infrared heat spreads evenly in all directions and feels pleasant even when standing next to the heater. At the same time, heat also spreads more evenly in large rooms than it does when using a fan heater.

Hipers and Weltem heaters have 12 different safety systems which make the device especially safe. The heat radiating from the heater is not hot and the outer surfaces of the device do not burn.

The heater is easy to use, because it does not need permanent installation. It has durable wheels which make the heater easy to move to where ever you want. The operation mode is especially quiet – only 40 dB.

Hipers or Weltem is the most efficient and pleasant heating solution for many rooms. Perfect for industrial buildings, garages, workshops, shelters, stables, tents, terraces, public events, and construction sites.

Most of our products come with a 2-year factory warranty.

Pildid / - - heating

The efficiency factor of diesel-powered Hipers and Weltem infrared heaters is approximately 97%

Modern technological solution

The device has a burner with a pump which makes hot gas circulate in ceramic-coated pipes, thus radiating infrared heat. The three-fold combustion process ensures completely pure residual gases, and the heater does not need an additional flue tube, which means the entire combustion result is used for heating. The regular ventilation of rooms is sufficient.

Odourless combustion residue

Fuel generally emits soot and unpleasant odour as a result of combustion. The fuel sprayed in the Airrex or Weltem combustion chamber burns very quickly, which results in minimum soot and odour, if any at all.

Very effective noise reduction

The silencing system in the exhaust pipeline makes the heater very quiet (40 dB).

Exhaust system which saves energy and eliminates odours.

The cellular system of the precious metal catalyst of the combustion chamber also burns residual gases and ensures an efficient and even combustion process.

General specification

  • Improved touch-sensitive switch
  • Automatic thermostat check
  • Timer 0–24 h
  • Interval timer
  • Sensors and alarm for fuel level, inclination angle, overheating, and combustion process
  • Easy-to-use touch-sensitive switch panel with LED indicator panel and a remote

The heater has 12 safety systems:

  • Ignition safety protection
  • Flame protection
  • Roll-over sensor which switches the heater off
  • Overheating protection
  • Safety system which reacts to power cuts
  • Power supply protection
  • Burner protection
  • Feel level sensor
  • Temperature sensor
  • Engine start-up help
  • Child lock
  • Programmable switch-off time

Questions and answers


Does the heat also spread in large rooms?

Yes, it does. Infrared heat spreads through very long distances. It does not need a fan for that – infrared heat heats materials, such as walls, floors and items in the room.

Why is infrared heat more efficient than a ventilator?

Infrared radiation heats materials.  Fan heaters heat the air. For example, if you open a window, all the heated air goes out and is replaced by cold air. The materials heated by infrared radiation save the heat and continue to heat the room even after the room has been ventilated. Fan heaters have to start all over again, thus consuming more energy. This is why our heaters are considered an extremely efficient and economic heating source for temporary facilities.

How is it possible that the burned diesel fuel does not leave behind any odour?

If the fuel has been almost completely burned, it does not leave behind any odour or dangerous residue. Carbon monoxide is formed as a result of incomplete burning. After more than 20 years of product development, Weltem and Hipers have polished the working process to perfection.

Why is there some kind of smell when the machine starts or finishes working?

When the heater starts/finishes working, a small amount of the smell of fuel may be released from the exhaust tube, because the burner cannot completely burn the fuel at the start or end of the process. The odour is not hazardous and can be reduced by using biofuel.

How can I be sure that the heater does not emit toxic exhaust gases?

The exhaust gas emission of Hipers and Weltem heaters has been examined and measured at the energy-technology laboratory of Kymenlaakso University of Applied Sciences in Finland.

Why does my heater consume more fuel than indicated by the manufacturer?

Weltem WHO-095, WHO-135 and Hipers DSO-120 consume 0.9-1.24 litres per hour in working mode. Fuel consumption depends on the desired temperature level, roof and wall insulation of the room, number of windows and doors and the frequency of their opening/closing, or whether any cold items have been brought to the room, etc. The heater consumes more fuel at the start of the working process, because the materials are still cold. Once they have become warm, fuel consumption drops significantly.

Can the heaters be started by using the cigarette lighter receptacle of a car?

Yes, they can. At least a 150W inverter is required. So you can also use the heater in trailers or caravans.

I have been using the heater for a few days now. There are water droplets on the windows. Does the heater really create so much humidity?

The infrared heater does not create enough humidity for it to condense on the surface of the window. If you are using the infrared heater for the first time and have previously been using fan heaters, come condensation may appear on the windows. This is due to the fact that infrared radiation starts to heat the materials in the room, all the while releasing the humidity stored in them, which may then become condensed on the windows. Once condensation has appeared, we recommend keeping the temperature of the heater at 20 °C so it will remove the excess humidity from the room.

What kind of preparations do I have to make in order to start using the new heater?

The infrared heater does not require any special preparation. Fill the tank with fuel, and it is recommended to first start it outdoors or in a well-ventilated room. A new heater may emit odours from production residue, such as the smell of the powder paint warming up, etc.