Most electric patio heaters use infrared radiation to transfer heat directly towards people, furniture and other surfaces within the radiation field. Unlike heaters that primarily warm and circulate room air, this makes infrared technology useful for open or partially open seating areas where heated air would disperse quickly.

The actual comfort you experience depends on more than heating output alone. Distance, orientation, mounting height, wind exposure and whether the seating area is directly within the radiation field all influence how effectively the heat is perceived.

Patio heaters are available with different electrical outputs and stated effective areas. Use these figures as model-specific selection information rather than assuming that one fixed wattage-per-square-metre rule applies to every terrace.

A small sheltered balcony, a covered dining area and an exposed terrace can require very different heating arrangements. Consider the size and shape of the occupied area, mounting distance, wind exposure and whether one or several heaters are needed to direct radiant heat towards the required seats.

Wall-mounted infrared heaters are useful for fixed seating areas where the radiation can be directed from a suitable wall towards the occupied zone. Their position keeps the heater away from valuable floor space and can provide a clearly defined radiation direction.

Check the permitted mounting height, inclination angle, wall material and minimum distances for the exact model. A heater approved for wall mounting is not automatically suitable for ceiling mounting, and the supplied brackets must be used according to the installation instructions.

Ceiling-mounted patio heaters are practical for covered terraces, balconies and other suitable structures where overhead installation is possible. They leave walls and floor areas free while directing radiant heat down towards the seating area.

The mounting height affects both the size and intensity of the radiation field. Install the heater only at the distances and on the structures approved for the specific model, and confirm that the ceiling or suspension point can support the appliance safely.

Freestanding patio heaters can be positioned close to the seating area without permanent wall or ceiling installation. Depending on the design, heat may be directed towards one side, distributed around the heater or moved across an area by an oscillation function.

Choose a stable, level position and consider where the power cable will run. Portable placement does not remove the need to observe the model-specific minimum distances, weather restrictions and protection requirements.

Infrared patio heaters can differ significantly in the amount of visible light they emit. Quartz, halogen and carbon heating elements can produce a visible warm glow, while selected low-glare designs reduce the amount of visible light released into the surrounding area.

Dark infrared heaters provide another option where visible heater glow is undesirable. They use infrared radiation with little or no visible light emission, but their operating characteristics and suitability for wind-exposed locations can differ from short-wave radiant heaters. Choose the technology according to the required heat, location and lighting concept.

Do not treat every infrared heater as weatherproof simply because it is marketed for outdoor applications. The protection rating indicates defined levels of protection against contact, foreign objects and water, while the operating manual determines the locations and weather exposure permitted for the exact model.

A heater intended for a roofed and weather-protected terrace can have different installation limits from a model approved for more exposed outdoor conditions. Check both the IP rating and the manufacturer's intended-use instructions before choosing the installation position.

Many patio heaters offer selectable heating levels so that you can adjust the electrical output to the current conditions. Depending on the model, additional functions can include remote control, timers, digital displays, oscillation or lighting.

These features vary considerably between product families. Compare the exact specification rather than assuming that every wall, ceiling or freestanding patio heater provides the same controls or number of heating stages.

An electric patio heater consumes electrical energy according to its power level and operating time. A heater operating continuously at 2,000 watts uses more electricity over the same period than when it is operated at a lower available heating stage.

Infrared heating can focus heat on an occupied outdoor area instead of attempting to heat a large volume of surrounding air, but this does not guarantee a particular energy saving or operating cost. Compare the heating task, output level and expected operating time rather than relying on general efficiency claims.

Start with the outdoor seating area and decide where radiant heat can be directed effectively. Then compare the technical and installation requirements of the available models.

• Match the heating output and stated effective area to the seating zone and actual outdoor conditions;
• Choose between wall-mounted, ceiling-mounted and freestanding designs according to the available installation space;
• Consider wind exposure, mounting distance and orientation when planning the radiation field;
• Compare visible-light characteristics where the existing lighting atmosphere is important;
• Check the IP rating and the manufacturer's permitted level of weather exposure for the exact model;
• Observe all specified mounting heights and minimum distances from people, furniture and combustible materials;
• Compare heating levels, timers, remote controls, oscillation and lighting only where these functions are provided by the selected heater;
• Use a suitable electrical supply and follow the model-specific instructions for outdoor operation.