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A patio heater exists to stretch your outdoor season — to keep a deck, courtyard or covered patio usable on evenings when the temperature would otherwise send everyone indoors. The specs that decide whether it does that job are about reach and run time, not the brushed-steel finish or the dancing flame effect.
BTU and radiant heat: what determines patio heater warmth?
Heat output measured in BTU is the number that matters. A full-size standing propane patio heater typically produces 40,000–48,000 BTU, a tabletop unit around 10,000–12,000 BTU, and an electric infrared patio heater about 1,500 watts (roughly 5,100 BTU). More BTU buys a wider warm radius, not a hotter single spot.
Outdoors, most of that heat is fighting open air, so the rating mostly determines the size of the comfortable circle, not the intensity at the center. A standing unit warms a rough 9–18 foot diameter. A tabletop model really only reaches the people at one table. A common complaint is buying a low-BTU decorative heater and finding it does almost nothing once a breeze picks up. Outdoor radiant heat has nowhere to accumulate, so under-sizing hurts far more here than in an enclosed room.
Propane, natural gas, electric or infrared: which fuel type fits your patio?
Propane standing heaters are the most portable and the most powerful, but you refill a tank. Natural gas heaters cost the least to run and never need refilling, but they require a fixed gas line. Electric infrared heaters are the only sensible choice under a covered patio or anywhere ventilation is limited.
Propane is where most buyers start, because it moves anywhere and puts out the most heat. A 20-lb propane tank lasts only around 8–10 hours at full output, so factor refills into the real running cost. Natural gas trades that portability for a permanent line and the cheapest per-hour running cost of the three. Electric infrared produces no combustion byproducts. That's why it's favored for enclosed porches, three-season rooms and any space without generous open-air ventilation — a gas flame in a poorly ventilated space is a carbon monoxide risk, not just an efficiency question.
Freestanding propane heaters
A freestanding propane heater is the default for an open deck or courtyard. It needs no wiring or gas line, so you can reposition it anywhere the tank and base fit, which is why brands like Hiland, AZ Patio Heaters and Fire Sense build most of their lineup around this format.
Wall-mounted electric infrared heaters
A wall-mounted infrared heater bolts to a wall or ceiling beam and radiates heat directly onto people below, without moving air the way a fan-forced unit does. It suits a covered porch or restaurant patio where floor space is tight and running a gas line isn't practical. Commercial-grade wall-mounted infrared units, the kind Bromic is known for, are rated for near-continuous outdoor use.
What size (BTU) patio heater do you need for your deck?
Match BTU to the area you want warmed. As a rough guide, a small tabletop for two to four people needs 10,000–15,000 BTU, a mid-size seating area 30,000–40,000 BTU, and a large open deck the full 40,000–48,000 BTU of a standing unit. Wind and open sides push you toward the higher end.
Unlike an indoor room, there's no ceiling to trap heat outdoors. The honest rule is to size up rather than down — the failure mode owners report is almost always "not enough," rarely "too much." If your patio is partly enclosed or wind-sheltered, a lower rating goes further. A fully exposed deck needs everything a standing propane unit can produce, and it still only delivers comfort within a defined cone.
A practical way to sanity-check your estimate is to think in coverage diameter rather than square footage. Manufacturers usually state a rough warm radius, and a heater claiming an 18-foot spread is really promising comfort for a circle you might seat six to eight people in, shrinking as the wind rises. If your seating plan is wider than the heater's cone, two smaller units placed at opposite corners often beat one large unit trying to cover everything from a single point.
Tip-over safety and stainless steel: features worth paying for
Worth it: an anti-tilt tip-over shut-off, a wide sturdy base or weighted bottom, a stainless steel burner and body, and a piezo or electronic ignition. Skippable: flame-effect glass tubes, app connectivity, and decorative finishes that add cost without adding heat or stability.
The single most important safety feature is the tip-over shut-off, because standing patio heaters are tall and top-heavy, and wind gusts do knock them over. A weighted or fillable base — some let you add sand or water — matters for the same reason. Stainless steel construction resists the rust that ruins cheaper painted-steel units within a season outdoors, so it's worth the premium on anything left uncovered. Electronic ignition saves the frustration of a manual match-light every time. The flame-tower glass tube looks impressive but adds fragile glass and cost — a common complaint is a cracked or shattered tube after a season outdoors — without improving the warmth you actually feel.
Tabletop vs freestanding heaters
A tabletop heater is the low-commitment option: it sits on an existing table, needs a small propane cylinder, and heats one seating group rather than a whole deck. A freestanding heater costs more and takes up floor space, but it scales to a full patio and is easier to reposition as your seating layout changes.
Propane tank size and running cost
Most freestanding units hide a standard 20-lb propane tank in the base, and that tank size drives your real running cost more than the heater's price tag. Budget for a refill every 8–10 hours of full-output use, and remember a mid or low setting stretches that considerably on a mild evening.
Weatherproofing and zone heating: what owners complain about most
The recurring complaints are wind blowing out the flame or scattering the heat, tanks emptying faster than expected, rust on units that weren't weatherproof or left uncovered, and tip-over accidents. Almost every one traces back to buying for looks rather than for stability and output.
Wind is the defining outdoor problem: it extinguishes gas flames and disperses radiant heat, which is why sheltered placement and adequate BTU matter more than any feature. Rust is the second theme. Owners consistently report that a heater without a genuinely weatherproof finish corrodes within a season if left uncovered, so a fitted cover is close to mandatory even on stainless steel. Zone heating — running one or two heaters over the seating area you actually use, rather than trying to warm an entire deck evenly — is the strategy most owners settle on once they've owned a heater a full season.
Is an outdoor heater worth it for your patio or deck?
Buy an outdoor heater if you have real deck or patio space you'd use more often with warmth, and you'll match BTU and fuel type to that space. Skip it if your area is tiny, fully exposed to constant wind, or if a fire pit or enclosing the space would serve you better.
A patio heater is a comfort purchase, not a climate-control one. It warms people in an open space rather than conditioning a room, so it sits apart from the indoor categories on this site. Budget for a weatherproof cover from day one — it's the single cheapest thing you can do to protect a stainless steel or painted-steel body from the rust that ends most units early, propane or electric alike. If your real goal is a room you can use year-round, the economics point toward proper indoor heating instead; see how the whole pillar fits together in our guide to heating and cooling a room efficiently. For the specific models and what owners say about them, start with the patio heaters hub, browse the full heating section, and see How We Rank for how every recommendation here is sourced, including CSA-listed models for the safety-conscious.