Extending Your Outdoor Season: Choosing the Right Radiant Heater for Your Patio

Once the structure is clear, five technical decisions sit underneath it. None of them is decisive on its own, and all of them follow from the structural choice above.

Coverage and wattage is the first decision, and it carries more weight than any other. The wattage budget per square metre tracks the openness of the space: a covered pergola sits at 100 to 150 W/m², a semi-covered terrace at 200 to 300 W/m², and an open deck at 300 to 400 W/m². The plain-language read on those numbers is straightforward. At the open-deck end of the range, a standard-sized deck of around 16 to 20 square metres typically needs two well-placed heaters rather than one, because the radiant cones overlap and the warmth feels even rather than spotty. At the covered-pergola end, a single mid-output unit usually finishes the job for the same footprint. Above about 20 m² in any context, two units placed thoughtfully outperform one larger unit working alone.

Mounting and reach is the second decision, and it follows from how the structure above the seating area is built. Effective mounting height for a wall or ceiling-mounted unit is 2.4 to 2.8 metres above seated head height, which in most domestic patios translates to roughly the underside of a standard pergola beam or a soffit at a comfortable ceiling height. Lower than that band and the heat sits on the top of the head rather than the body. Higher than that band and the radiant intensity at seated level starts to drop off. Extension rods and swivel joints adjust within the band without redesigning the room, so a fixed soffit at 3.2 metres can still place a heater at the right height for a seated dinner.

Weatherproofing follows from the same structural read. IP24 belongs under cover, IP25 covers semi-exposed installations, and IP65 is the only rating for fully open exposure. The shorthand is worth memorising because it cuts most catalogue confusion in half: if the unit will see rain directly, it needs IP65; if a solid roof breaks the rain line above it, IP24 or IP25 is the right band.

The last two decisions are character choices as much as performance ones. Carbon spiral and carbon fibre elements both deliver mid-wave infrared, and the differences between them sit at the level of warm-up speed and visible glow. Spot units reach full output in under fifteen seconds with a faint orange glow that signals the heater is on without lighting the room. The Vision 3200W, with its larger glass-ceramic front, takes 30 to 60 seconds to reach full output and runs cooler in visible light at 300 lm, which is the right register for an enclosed alfresco where a glowing element would compete with the lighting scheme. Pure+ adds a glass-ceramic front for full weather rating and a 15 to 30 second warm-up. Control sits at the same character level. Two-stage 50 percent and 100 percent output is the baseline across every series; ZigBee, an eWeLink WiFi smart switch, and Alexa or Google Assistant integration layer on top where smart-home integration matters. For shoulder-season evenings, the 50 percent stage is usually the right answer, and the cost-per-evening of running a heater at half output for an hour or two before guests arrive is modest.

Can I use a radiant heater on an uncovered patio?

Yes, provided the unit is rated for it. An IP65-rated heater is built to handle direct rain and water exposure without a weathershield, which makes it the right choice for an exposed deck, rooftop terrace, or balcony. IP24-rated units, by contrast, require some form of overhead cover. The rating is printed on the spec sheet and is the single most useful number to check before buying.

Will a radiant heater heat my whole patio or just where I'm sitting?

Radiant heaters warm the people and surfaces in their direct radiant zone, so the answer depends on where you have placed them and how many you have. A single mid-output unit covers roughly 8 to 11 square metres effectively, which is enough for a four-to-six-seat dining setting. For larger entertaining zones, two heaters arranged to overlap their coverage produce a more even warmth than one larger unit working alone.

Do I need an electrician to install one?

Yes. Heatscope heaters run on 220 to 240 V hard-wired supply and require an electrician for installation, which is also the right person to advise on weatherproof IP-rated cabling, switch placement, and the ZigBee or WiFi integration if it forms part of the scheme. Planning the cable runs at the same time as the lighting layout is the easiest way to keep the finished install tidy.

How early in the season is it worth turning a radiant heater on?

Earlier than most homeowners assume. Outdoor thermal comfort research consistently shows that radiant heat dominates how warm a body feels outdoors, more than air temperature and significantly more than wind. In practice, 50 percent output during the first cool hour of an evening at 12 to 15 °C extends usable outdoor time by an hour or two, well before anyone would otherwise reach for a heater.

The right outdoor heater is not the most powerful one in the catalogue. It is the one that fits the structure above the seating area, matches the wattage budget that structure implies, and reads as part of the architecture rather than as an interruption to it. Once those three decisions are settled, the rest is detail: finish, mounting height, control layer, the small choices that turn a piece of equipment into part of the room.

Mapped against the three archetypes, the Heatscope series sort cleanly. For most covered verandahs and pergolas, the Spot or Vision series is the starting point. For an exposed deck, the Pure+ 3000W is the only model rated for direct weather. For a semi-covered terrace with a solid roof and open sides, the Vision 3200W carries the global case, with the Next 3000W serving the same brief in US and Canadian markets.

What that buys, in the end, is months. Not whole new ones, exactly, but the front and back of every season the patio currently loses to a small temperature drop at sundown. The April evening that used to end at half past seven now runs until the conversation does. The October dinner that used to move inside stays where it started. That is the quiet kind of square-metre gain a renovation cannot otherwise add, and it is the reason a well-chosen radiant heater earns its place in the brief.