Patio and Garden Infrared Heaters – How to Heat Outdoors Efficiently and Safely

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Infrared Heaters for Terraces and Gardens – How to Heat Outdoor Spaces Effectively and Safely

Anyone who has a terrace, pergola or garden gazebo knows that moment in late September or early October when the evenings start to get cooler and sitting outside becomes uncomfortable. Classic solutions – blankets, jackets, hot tea – only help to a certain extent. A patio infrared heater can extend the outdoor seating season by weeks, even months. We've known this for years in restaurants – outdoor seating areas with infrared heaters operate from March to November. What works in the hospitality sector works just as well at home.

This guide focuses on practical, technically accurate information about choosing, installing and safely using infrared heaters outdoors. You'll find specific figures, real-life examples and answers to the questions we encounter most often with our customers. If you're looking for a more general introduction to infrared heaters, also read our article How to Choose an Infrared Heater – Type, Output and Placement According to Space.

Why an infrared heater and not another solution?

Outdoor heating is a specific discipline. Convectors, hot-air fans and classic radiators don't stand a chance here – you simply can't hold air in place outdoors. Any solution based on heating the air is essentially pointless on a terrace or in a garden, because the heated air immediately escapes into the surroundings.

An infrared heater works on a completely different principle: it doesn't heat the air, but directly heats objects and people within the beam's reach. It's the same as the sun – we don't see the sun heating the air, but it heats us directly. When you sit under an infrared heater on the terrace, you feel the warmth immediately, without the surrounding air needing to warm up. This is the key feature that makes infrared heaters work outdoors.

Gas patio heaters and portable gas heaters are another alternative – you can find their comparison with electric infrared heaters in the article Electric vs. Gas Infrared Heaters – Comparison of Costs and Use. For most households, electric infrared heaters are more convenient, safer and easier to control.

Types of outdoor infrared heaters – which one suits a terrace?

Not every infrared heater is suitable for outdoor use. The main categories we encounter in practice are:

Short-wave (halogen) infrared heaters

These operate at a bulb temperature of 1,800 – 2,200 °C, emitting both light and heat. Their advantage is an instant onset of heat output – within a second. The disadvantage: a noticeable red glow, which some people find disturbing during an evening sit-out. Outdoors, they're very popular precisely because of their quick response and high output density – typically 1,500 to 3,000 W. At 2,000 W, the effective heat range is typically 4 – 6 m². You can read more about types and wavelengths in the article Short-Wave vs. Medium-Wave vs. Dark Infrared Heaters – Which Type Suits You.

Medium-wave infrared heaters

These operate at a lower radiant temperature (600 – 900 °C), emit less visible light and provide more thermal comfort. The heat-up is somewhat slower (15 – 60 seconds to full output). Outdoors, they're best suited where light glare is undesirable – for example, at a romantic evening gathering or in restaurants with a pleasant atmosphere.

Dark (tube) infrared heaters

These emit heat without any visible light. Their emitter operates at a temperature of 400 – 600 °C. Heat output is in the range of 1,500 – 6,000 W. They are suitable, for example, for covered restaurant terraces or larger pergolas where you need constant thermal comfort without light disturbance. Disadvantage: compared to short-wave heaters, they are larger and have a longer warm-up time.

Portable stand-mounted infrared heaters

A special category for the garden – stand-mounted units that require no installation and can simply be moved as needed. They plug into a 230 V outlet, with output typically 1,500 – 2,000 W. Suitable for garden parties, barbecue gatherings, or cases where you don't want to mount anything. However, keep in mind that cable management on a terrace can be impractical.

What output do you need for a terrace or garden gazebo?

This is the most common question and also the most important one when choosing a heater. Outdoor spaces work differently than indoor ones – there's no heat loss through walls, but you do need to account for heat escaping into the open space. General rule of thumb for outdoor use:

Protected terrace (glazed or enclosed by masonry walls): 150 – 200 W/m² of area under the heater
Partially covered terrace (pergola, shelter): 200 – 300 W/m²
Open terrace or garden corner: 300 – 500 W/m² (depending on wind and temperature)

Real-life example: a customer had a 4 × 5 m pergola (20 m²), with two sides open and one wall enclosed. We installed three 2,000 W infrared heaters (6,000 W total), i.e. 300 W/m². The result was satisfactory at outdoor temperatures down to –5 °C. When it dropped below –10 °C, the thermal comfort was only acceptable, not comfortable.

You can find a more detailed calculation in the article What Infrared Heater Output Do I Need for a Garage, Terrace or Workshop. It also includes specific tables and calculations.

IP rating and weather resistance

This is where the most common mistakes happen with uninformed purchases. Not every infrared heater can be installed outdoors. Outdoor units must have a minimum rating of IP44, preferably IP65 or higher. What do these numbers mean?

IP44: protected against solid objects larger than 1 mm and against water splashing from all directions. Suitable for protected locations (under a roof, under a pergola).
IP55: protected against dust (partially) and water jets. Suitable for terraces exposed to sideways rain, but still ideally under a roof cover.
IP65: complete protection against dust and powerful water jets. Suitable for most outdoor installations, including semi-open garden areas.
IP67/IP68: protection against short-term or long-term immersion in water. In practice, above standard for infrared heaters, but such models do exist.

From experience: a customer installed a regular indoor infrared heater (IP20) under a pergola. After the first rain, the unit short-circuited. Besides the financial loss, an injury could have occurred as well. Always check the IP rating before buying. Proper outdoor infrared heaters have their IP rating clearly stated in the technical documentation and on the unit's label.

Besides the rating, also pay attention to the housing material. Quality outdoor infrared heaters are made of stainless steel or have a powder coating resistant to UV radiation and corrosion. Cheap units with a chrome surface may start rusting after just one season.

Mounting height and tilt angle – where exactly to install the infrared heater?

The mounting height directly affects how large an area the infrared heater will cover and how warm a given spot will feel. General rules:

Height 1.8 – 2.2 m: intense heat in a small zone, suitable for fixed seating (café table, garden bench).
Height 2.2 – 2.8 m: the most commonly used height for terraces, a good compromise between intensity and coverage area.
Height 2.8 – 3.5 m: larger coverage area but lower intensity; suitable for higher outputs (2,500 W and more).
Height above 3.5 m: the infrared radiation effect drops significantly (intensity decreases with the square of the distance), only very high-output units (4,000 W+) are recommended.

The tilt angle of the infrared heater should be 15 – 30° from vertical (i.e. 60 – 75° from horizontal). A larger tilt means the heat is directed more toward seated people and less toward the floor. Many outdoor infrared heaters have an adjustable swivel mount, which is a great advantage when mounting on a ceiling or pergola crossbeam.

You can find a detailed installation procedure in the article Mounting an Infrared Heater on the Ceiling or Wall – Procedure and Safety Requirements.

Minimum safety distances outdoors

Infrared heaters emit intense heat and require safety distances from flammable materials to be observed. This is even more important outdoors, since the surroundings contain more flammable items – wooden pergola structures, parasols, canopies, fabric screens, dry vegetation.

Basic safety distances that must be observed:

From the roof/ceiling structure (wood, wood-plastic composite boards): minimum 50 cm, recommended 80 cm or more.
From side walls made of flammable material: minimum 30 cm.
From fabric screens, canopies, parasols: minimum 80 cm, ideally 120 cm – fabrics can ignite under prolonged heating above 200 °C.
From tables, chairs, seat cushions: minimum 50 cm.
From plants (hedges, climbing plants on a pergola): minimum 60 cm.

A real-life warning: a customer had a pergola with a retractable canopy that wasn't retracted while the infrared heater was in use. The canopy was only 40 cm away from the unit. After an hour of operation, the canopy began to melt. The damage was material, but it could have been much worse. Always check that no flammable materials remain within 1 metre of the infrared heater.

Details on distances and safety requirements are also clearly summarized in our article Frequently Asked Questions About Infrared Heaters – Consumption, Safety, Distance from Objects.

Electrical connection of outdoor infrared heaters

Outdoor infrared heaters require suitable electrical installations. A few essential points:

Socket vs. fixed wiring

Infrared heaters up to 2,000 W can be connected to a standard 230 V/16 A outlet. The outdoor socket must have a minimum rating of IP44, ideally IP55 with a protective cover, and must be protected by a 30 mA RCD residual current device. Units above 2,000 W (or a combination of several units) must be connected via a separate circuit breaker, preferably on a dedicated circuit.

For loads above 3,500 W and three-phase infrared heaters, a 400 V three-phase connection is required – this solution is mostly a matter for hospitality terraces and commercial premises. Three-phase units are rarely encountered in a home setting.

Extension cords and supply cables

If you use an extension cord, it must be rated for the full power draw of the infrared heater and suitable for outdoor use (marked H07RN-F or similar, rubber insulation). A regular household extension cord with thin conductors (1.5 mm²) is unsuitable for 2,000 W and above – it may overheat. For permanent installation, we always recommend laying a fixed cable in a UV-resistant conduit or cable trunking.

Switching and control

Outdoor infrared heaters are switched on in practice in various ways:

Manual switch: the simplest option, suitable for small installations.
Thermostat controller: maintains the set temperature, saves energy. The thermostat must be suitable for outdoor use (IP44+).
Motion sensor (PIR): automatically turns the heater on when motion is detected, ideal for garden paths and entrance areas.
Timer: simple automation for regular evening use.
Smart control (WiFi, remote control): an increasingly common option, turning the heater on via a mobile app.

Arranging multiple infrared heaters on a larger terrace

For terraces larger than 10 – 12 m², a single infrared heater is not enough – neither in terms of output nor even coverage. Proper placement of multiple units ensures comfortable warmth without hot and cold spots.

Basic placement rules:

Position the infrared heaters so their coverage zones overlap slightly – this eliminates cold spots.
For long, narrow terraces (e.g. 3 × 8 m), it's better to place several weaker units in a row than two strong ones at the ends.
For square terraces (e.g. 5 × 5 m), four corner-mounted infrared heaters aimed inward are suitable, or alternatively two central ceiling-mounted units.
Avoid mounting directly above the seating area – although this is technically correct for maximum efficiency, psychologically a unit hanging directly overhead can feel uncomfortable. It's better to have a slight tilt from the side or from the head of the table.

Protection against adverse weather – what to do with your infrared heater in winter?

Outdoor infrared heaters are designed for outdoor environments, but long-term exposure to frost, snow and moisture affects their lifespan. A few recommendations:

Portable stand-mounted units should be brought into the garage or storage room for winter. Switch off, let cool, and store in a dry place.
Permanently mounted units can be left in place, but switch off the main circuit breaker and cover them with a protective cover (special infrared heater covers are available from manufacturers). Covers protect against mechanical damage from snow and ice and extend the life of the heating element.
Radiant tubes (halogen, medium-wave) are sensitive to mechanical impact – ice chunks or wind can break the heating tube just as easily as a direct hit. Protective grilles (included on most quality units) reduce this risk.
Electrical connection: always unplug or switch off the circuit breakers when the infrared heater is not in use for an extended period. Moisture can damage connectors even on units with an IP rating.

You can find more on maintenance in the article Maintenance and Cleaning of Infrared Heaters – How to Extend Lifespan and Maintain Efficiency.

Operating costs – how much will you pay for heat on the terrace?

One advantage of electric infrared heaters is the direct conversion of electrical energy into heat – efficiency is close to 100% (in terms of converting electricity into radiation). No energy is lost heating air that would simply drift away. Still, you need to account for real costs.

Calculation example: a 2,000 W infrared heater, electricity price of €0.25/kWh (approximate market price for 2024):

1 hour of operation = 2 kWh = €0.50
An evening gathering of 3 hours = 6 kWh = €1.50
A month (20 evenings) = 120 kWh = €30

If a terrace requires three such units (6,000 W total), monthly costs at the same usage level reach €90. That's still less than it would cost to air-condition and heat an indoor restaurant space for the same number of guests. In a household, consumption is of course lower – it depends on how many evenings and how long the heaters actually run.

A thermostat or power controller (dimmer) can reduce consumption by 20 – 40% by not running the unit at full power constantly, but maintaining the set level of thermal comfort.

Differences between outdoor and indoor infrared heaters

Many types of infrared heaters look similar, but there are fundamental design differences between outdoor and indoor versions. If you're considering a purchase, always check what type of environment the unit is certified for. You can find a detailed comparison in the article Outdoor vs. Indoor Infrared Heaters – What Are the Differences and What to Consider. Brief summary:

Parameter	Outdoor infrared heater	Indoor infrared heater
IP rating	IP44 to IP65	IP20 (common)
Material	Stainless steel, UV-resistant coating	Aluminium, plastic, steel
Connectors	Waterproof, sealed	Standard
Operating temperature range	–20 °C to +40 °C	0 °C to +35 °C
Price	Higher	Lower

Practical scenarios – what works for you?

Scenario 1: 3 × 4 m masonry terrace with a wooden shelter

A typical family terrace with a pergola, two sides protected by masonry, two sides open. Ideal solution: one 2,000 W infrared heater mounted on the underside of the crossbeam, at a height of 2.3 m, tilted at 20° toward the seating arrangement. At an outdoor temperature of –2 °C, thermal comfort was excellent; at –8 °C, it was pleasant. Total installation costs including wiring: approx. €250 – 400.

Scenario 2: 4 × 4 m garden gazebo, open on all four sides

An open gazebo is the most challenging case from a heating perspective. Here we recommend four 1,500 W units on the corner posts, aimed inward and slightly downward. Total output of 6,000 W covers 16 m² with acceptable thermal comfort down to –5 °C. In strong wind, the effect is significantly reduced – wind carries heat away from the body faster than the infrared heater can supply it. In such cases, we recommend side windbreak screens or glazing at least one side.

Scenario 3: 2 × 3 m balcony on a panel apartment building

On a balcony with three walls (masonry) and one open side, a single 1,000 – 1,500 W unit is sufficient. Mount it on the balcony ceiling or on the wall above the railing (aimed inward). Important: check the building management's rules regarding mounting equipment on the facade. A portable stand-mounted infrared heater is a hassle-free alternative here.

Scenario 4: Garden party – occasional use

For garden barbecues and occasional gatherings where you don't want anything permanently installed, portable stand-mounted infrared heaters are the best option. Place one or two 1,500 W units around the table. Power them from an outdoor socket using a cable suitable for outdoor use. After the event, simply take the unit back to the garage.

Frequently Asked Questions (FAQ)

Can I leave an outdoor infrared heater outside during rain?

It depends on the unit's IP rating. An infrared heater with an IP44 rating or higher can be operated during rain if it's mounted under a roof or pergola, where it's not exposed to direct heavy rain. Units with an IP65 rating can withstand direct water jets. Nevertheless, we recommend: if you're not using the unit and a strong storm is expected, switch it off at the breaker. Static electrical discharges can damage the electronics of controllers even in certified outdoor units.

How quickly does an infrared heater warm up the space in a garden gazebo?

An infrared heater doesn't heat the air, but directly heats people and objects. The feeling of warmth occurs practically immediately (with short-wave heaters) or within 1 – 2 minutes (with medium-wave and dark heaters). There's no need to wait for the "space to warm up" – this is precisely the huge advantage over convection heaters. When you sit down under a switched-on infrared heater, you'll feel the warmth within 30 seconds.

Is an infrared heater on a terrace safe for children and pets?

Yes, if safety distances are observed and the unit is properly mounted – out of a child's reach. The surface of the infrared heater's housing (cover, grille) heats up, but not to the point of causing immediate burns from brief contact. The hot radiant tube inside is behind a protective grille. Animals typically seek out warm zones on their own and don't get burned by the heater – they're just as sensitive to excessive heat as people and move away on their own. Still, keep an eye on your pets.

Why does my outdoor infrared heater switch off after a while?

The most common cause is thermal protection (the unit's thermostat). If the infrared heater is mounted too close to the ceiling, heat builds up around the unit and its internal temperature rises above the set value – the thermostat then switches it off. Solution: check the minimum distance from the ceiling (usually 10 – 20 cm), and ensure air can circulate around the unit's housing. Another cause could be a faulty breaker or a malfunction – you can find more on diagnostics in the article Common Infrared Heater Faults – Why It Doesn't Heat, Flickers or Switches Off.

How many infrared heaters do I need for a 20 m² terrace?

For an open terrace at an approximate output of 300 W/m², the total output works out to 6,000 W. That corresponds to three 2,000 W units or four 1,500 W units. For a partially covered terrace, 250 W/m² is sufficient, i.e. 5,000 W – for example, two 2,500 W units. Remember that several smaller units evenly distributed provide better thermal comfort than one large unit concentrated in the centre.

Can I use an indoor infrared heater on a terrace "protected" under a roof?

Technically, no – an indoor unit without sufficient IP rating must not be used outdoors, regardless of how well it's covered by a roof. Moisture in the air, condensation, a dewing metal structure – all of this can damage unprotected electrical parts. Furthermore, it violates the warranty, and any resulting damage (fire, injury) is not covered by insurance. Always use a unit certified for outdoor use.

Conclusion – outdoor heating is worth it

An infrared heater for a terrace or garden isn't a luxury, but a practical investment that extends your outdoor seating season by several months. With the right choice of type, output and IP rating, and by observing safety distances and electrical installation rules, it's a reliable, low-maintenance and efficient solution. Key points to remember:

An outdoor infrared heater must have at least IP44, IP55 or IP65 for side-exposed positions.
Size the output according to the type of space: 150 – 500 W/m² depending on the level of wind protection.
Mounting height 2.2 – 2.8 m, tilt angle 15 – 30° from vertical.
Observe safety distances from flammable materials, especially textiles.
For larger terraces, distribute the output across several smaller units evenly.
Thermostat control reduces consumption by 20 – 40% without reducing comfort.

All outdoor infrared heaters in the atria.sk category are labelled with the mounting type and IP rating, making it easy to choose the right unit. If you're not sure which one to choose for your specific case, read more articles in our Knowledge Centre – for example, How to Choose an Infrared Heater – Type, Output and Placement According to Space or Outdoor vs. Indoor Infrared Heaters – What Are the Differences and What to Consider.

Have a question on this topic?

Can't decide, or dealing with a specific situation in your household? Write to us – we'll be happy to help.