Pergolas
Heating a pergola
Beams overhead to mount to, partial shelter, and open sides for airflow. A pergola is the best case for mounted infrared on this whole site.
Mount an electric infrared heater to a pergola beam at seven to nine feet, angled down at the seating. A pergola gives you the structure infrared needs and open sides for airflow, and its published IP rating matters because rain comes through the slats.
Why a pergola suits infrared so well
Radiant heat has one requirement that decides whether it works: it needs to come from above, aimed at people. On an open patio there is nothing to mount to, which is why infrared struggles there and a tower wins. A pergola solves that problem completely.
Beams at eight or nine feet are exactly the right height. They are structural, so they will actually hold a mounted appliance. And a pergola's open sides mean there is no ventilation question at all — though there is also no ventilation question for an electric heater in the first place, which is a second reason it suits.
Meanwhile the clearance arithmetic that rules towers out of covered patios rules them out here too, and more firmly: a pergola is timber, usually with planting growing over it, and 36 inches of published clearance under a wooden beam at eight feet leaves 60 inches of heater. No tower is that short.
The catch: a pergola is not a roof
Slats overhead give partial shelter. They break up wind, they retain a little warmth, and they do not stop rain. For sizing, that puts a pergola between our open and covered figures — closer to open than people expect.
| Patio area | Open sky, no roof | Roof overhead, open sides | Roof plus screens or partial walls |
|---|---|---|---|
| 100 sq ft | 2,000 BTU/h | 1,300 BTU/h | 1,000 BTU/h |
| 150 sq ft | 3,000 BTU/h | 1,950 BTU/h | 1,500 BTU/h |
| 200 sq ft | 4,000 BTU/h | 2,600 BTU/h | 2,000 BTU/h |
| 250 sq ft | 5,000 BTU/h | 3,250 BTU/h | 2,500 BTU/h |
| 300 sq ft | 6,000 BTU/h | 3,900 BTU/h | 3,000 BTU/h |
Area x 20 BTU per square foot for an open patio, then multiplied by 0.65 for a roof and 0.5 for a roof plus screens, and by 1 for average exposure. The reconciliation of where each factor comes from is on this page, not hidden.
Use the open column if the pergola is bare, and something between open and covered if it has a solid canopy, dense planting or a retractable shade. A 200 sq ft bare pergola comes to about 4,000 BTU/h, which is more than one 1,500 W unit — so two units, or one unit aimed carefully at where people actually sit rather than at the whole footprint.
That last point matters more here than anywhere. Radiant heat covers what it points at, so a pergola with a defined seating group can be handled by one well-aimed unit even when the area figure says otherwise. Size for the chairs, not for the footprint.
Quick picks
Ranked for fit, not for hype. Output is the maker’s published figure; reach is computed from it or from the maker’s own radius claim, and the table says which. Tap a row for the full write-up, or go straight to the listing.
| # | Product | Best for | Output | Reach | Price |
|---|---|---|---|---|---|
| 1 | Heat StormNo photo Heat Storm TradesmanThe one electric unit here with a published IP rating, which is the difference between a heater that survives a wet winter mounted outdoors and one that is a warranty claim waiting to happen. | Leaving outside all year | 1,500 W | 256 sq ft | Check price on Amazon |
| 2 | Dr. Infrared HeaterNo photo Dr Infrared 1500 WRadiant heat that a breeze cannot blow out, on a plug. 1,500 W is only 5,118 BTU/h, which sounds like nothing next to a propane tower and lands far more of itself on you. | Wind, and anywhere with a roof | 1,500 W | 256 sq ft | Check price on Amazon |
| 3 | Star PatioNo photo Star Patio ZHQ1530IP55 is the highest published ingress rating in this roundup, which makes it the one to mount where rain actually blows in sideways. Everything else about it is a standard 1,500 W infrared unit. | The wettest exposed spot | 1,500 W | 256 sq ft | Check price on Amazon |
Reach marked “claimed” is the maker’s own published figure. Reach without that label is ours, computed from published output at 20 BTU per square foot for an open patio. Neither is a measurement we took.
Top pick · Leaving outside all year
Heat Storm Tradesman HS-1500-OTR Outdoor Infrared Quartz Heater
The one electric unit here with a published IP rating, which is the difference between a heater that survives a wet winter mounted outdoors and one that is a warranty claim waiting to happen.
- Fuel
- Electric
- Output
- 1,500 W = 5,118 BTU/h
- Reach (computed)
- 256 sq ft · 9.0 ft radius
- Cost per hour
- $0.28
What works
- A published IP35 rating. Almost nobody in this category publishes an ingress rating at all, and mounting an unrated electric heater outdoors is a gamble you cannot price
- The maker publishes its own BTU figure (5,200), which is within a rounding error of the 5,118 our watts-to-BTU conversion gives — a company doing its own arithmetic honestly
- Wall or ceiling mount puts the heat above head height where a radiant beam belongs
What does not
- IP35 is splash-and-dust protection, not immersion — it survives weather, not a hose or standing water
- Fixed mounting means fixed aim. Get the position wrong and there is no adjusting it from the chair
- Same 1,500 W ceiling as every other plug-in electric heater
| Published specification | |
|---|---|
| Rated power | 1,500 W at 120 V |
| Published output | 5,200 BTU/h per the maker |
| Element | Infrared quartz |
| Weather rating | IP35 |
| Mounting | Wall or ceiling; a tripod variant exists separately |
| Maker’s coverage claim | None published — the reach figure above is ours |
| Safety listing | IP35 weatherproof rating published by the maker |
Who it is for
A permanently mounted heater on a pergola, porch ceiling or exterior wall that you never want to take down and store.
What it is not for
Portability, and any open patio with no structure to mount to.
2 · Wind, and anywhere with a roof
Dr Infrared Heater Carbon Infrared Patio Heater, 120 V / 1500 W
Radiant heat that a breeze cannot blow out, on a plug. 1,500 W is only 5,118 BTU/h, which sounds like nothing next to a propane tower and lands far more of itself on you.
- Fuel
- Electric
- Output
- 1,500 W = 5,118 BTU/h
- Reach (computed)
- 256 sq ft · 9.0 ft radius
- Cost per hour
- $0.28
What works
- Infrared warms objects, not air, so it is the only heat that survives a breeze — this is the single reason wind changes the whole buying decision
- No combustion means no flue gas, which is what makes it legal and sensible on a screened porch where propane is not
- Three settings matter more than they sound: 900 W costs a third less to run and is enough most evenings
What does not
- 1,500 W is 1,500 W. Nothing at this wattage heats faster than anything else at this wattage; the differences between electric heaters are beam shape and build, not power
- It heats what it points at. Step out of the beam and you are cold immediately — this is a fundamentally different experience from a tower
- A 120 V plug-in unit is capped by your circuit, not by the maker. See why 1,500 W is the ceiling
| Published specification | |
|---|---|
| Rated power | 1,500 W at 120 V |
| Settings | 900 W / 1,200 W / 1,500 W |
| Element | Carbon infrared lamp |
| Reflector | Mirror aluminum, 90% reflectivity per the maker |
| Housing | Anodized aluminum, rated for outdoor use |
| Mounting | Wall and ceiling brackets plus remote in the box |
| Maker’s coverage claim | None published — the reach figure above is ours |
| Safety listing | ETL listed, per the maker's published product data |
Who it is for
A covered patio, pergola or screened porch where you can mount it overhead and point it at where people sit, and anywhere wind ruins a flame.
What it is not for
A big open patio with nowhere to mount it. Radiant heat needs a line of sight and a place to hang from.
3 · The wettest exposed spot
Star Patio ZHQ1530 Wall-Mounted Electric Infrared Patio Heater
IP55 is the highest published ingress rating in this roundup, which makes it the one to mount where rain actually blows in sideways. Everything else about it is a standard 1,500 W infrared unit.
- Fuel
- Electric
- Output
- 1,500 W = 5,118 BTU/h
- Reach (computed)
- 256 sq ft · 9.0 ft radius
- Cost per hour
- $0.28
What works
- IP55 means dust-protected and rated against low-pressure water jets from any direction — a genuine step above the IP35 units
- The maker explicitly positions it for gazebo use, which is the enclosure where electric is the only correct answer
- Remote control on a wall-mounted heater is not a luxury; the unit is above head height and out of reach by design
What does not
- The listing publishes no coverage figure, so every reach number we show for it is our own arithmetic
- Wall mount only — there is no floor-standing option in this model
- 1,500 W, like everything else that plugs into a wall
| Published specification | |
|---|---|
| Rated power | 1,500 W at 120 V |
| Weather rating | IP55 |
| Mounting | Wall mounted |
| Control | Remote |
| Maker's positioning | Suitable as a gazebo heater per the listing |
| Maker’s coverage claim | None published — the reach figure above is ours |
| Safety listing | IP55 waterproof rating published by the maker |
Who it is for
An exposed wall on a gazebo, porch or balcony where weather gets at the unit and you still want electric heat.
What it is not for
Anywhere you need to move it, and any space large enough to need several thousand BTU rather than five thousand.
Sources for this entry
What we would skip
A list with no losers is a list nobody edited. These are the choices we would actively steer you away from, and why.
A propane tower under a pergola
The overhead clearance figure applies to a pergola beam exactly as it applies to a solid ceiling — 36 inches published for propane. Most pergolas sit at eight to nine feet, so an 87-inch tower does not fit. And a pergola is usually timber, often with planting on it, which is the least forgiving thing to put a flame under.
Mounting an unrated electric unit to a pergola beam
A pergola is open to the sky between the slats. A mounted unit up there gets rained on directly, which makes the published IP rating the specification that matters most. No rating published means sheltered positions only, and a pergola beam is not one.
Treating a pergola as a covered patio for sizing
Slats are not a roof. A pergola retains some warmth and considerably less than a solid ceiling does. Size it closer to the open-patio figure than the covered one, or use the covered figure and accept it will feel marginal on a cold night.
Mounting to a pergola
- Fix to a structural beam, not a slat. Slats are decorative and thin. The main beams are what carry the structure and what will hold a mounted heater.
- Seven to nine feet, angled down at the seating. If the pergola is lower than seven feet, angle becomes more important than height — aim across rather than straight down.
- Check the clearance to the slats above the unit. Fire Sense publishes 12 to 24 inches overhead for electric. A heater tucked up under close-set slats may not have it.
- Keep planting clear. Wisteria, vines and climbers grow into the clearance zone over a season. Whatever gap you leave in spring will be smaller by September.
- Run the circuit properly. Outdoor-rated cable, GFCI protection, and a circuit that is not shared. Surface-clipping a cable along a beam is fine if it is the right cable.
Two units beat one, usually
Pergolas tend to be rectangular and to cover a defined seating area, which is exactly the geometry where a single central heater underperforms. Two 1,500 W units at either end, each aimed inward at the chairs, cover a rectangle far better than one in the middle covering a circle.
It also doubles your output to 10,236 BTU/h, which handles a 200 sq ft bare pergola properly rather than marginally. The constraint is circuits: two 1,500 W units need two of them. The reasoning is here.
How we picked
- Ceiling-mount capability required. A pergola's advantage is the beam overhead, and a unit that cannot hang from it wastes the advantage.
- Weather rating weighted heavily. A pergola is not a roof — rain comes through the slats, and a mounted unit takes it.
- Clearance checked against slat and beam depth, which is tighter than an open ceiling.
- Output matched to a partially covered space, somewhere between the covered and open figures on our sizing model.
What we did not do
Everyone in this category says they tested twenty heaters. We have not tested any, and we say so. What we do instead: compile the published specs, compute the electrical and gas load from them, cite the maker’s own manual, and show the arithmetic so you can check it. The full method, including how to challenge a figure.
Common questions
What is the best heater for a pergola?
A mounted electric infrared unit, fixed to a structural beam at seven to nine feet and angled down at the seating. A pergola gives you exactly the overhead structure radiant heat needs, and its open sides mean no ventilation concerns.
Can you put a patio heater under a pergola?
An electric one, mounted, yes. A propane tower, no — Fire Sense publishes at least 36 inches of overhead clearance, and a typical pergola beam at eight or nine feet leaves nowhere near enough room for a 7-foot tower under a timber structure.
How do you mount a heater to a pergola?
Fix to a main structural beam rather than a decorative slat, at seven to nine feet, angled down at the seating. Check the published overhead clearance to the slats above, keep climbing plants clear of it, and run a dedicated outdoor-rated GFCI circuit.
How many heaters do I need for a pergola?
Usually two, and not because of total output. Pergolas cover rectangles and a single heater covers a circle, so two units at either end aimed inward cover the seating far better than one in the middle. They need two separate circuits.
Sources
Read next
Wall mounted patio heaters, and the rating that decides
Wall and ceiling mounted electric heaters, ranked on published weather rating and mounting.
Infrared patio heaters, and why wind does not touch them
Four infrared heaters and heat lamps, with what radiant heat does that a flame cannot.
Patio heater BTU calculator
Your patio's BTU requirement with every multiplication shown, plus why the published rules disagree.
Patio heaters for a covered patio
The clearance arithmetic for a roofed patio, and the mounted heaters that actually fit.
Watts, BTU, and the 1,500 watt ceiling
The watts-to-BTU conversion, and why a household circuit caps every plug-in heater at 1,500 W.