Best way to heat a patio

Best Way to Heat a Patio

ByKen

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Heating a patio is mostly a placement and safety question. The sources we opened cover gas-fired patio heaters, so this guide is built around them. It sets out what a county fire marshal’s guidance requires, what a federal recall notice says about one heater model, and where those sources stop, so you know which questions to answer from the manual and your local rules. It also explains why a single number, such as 5 feet of clearance, is only the start of a safe setup. The source details are in the Sources section near the end.

Quick answer

Use a heater that is listed for outdoor use and follow its manual. Keep it at least 5 feet from buildings, exits and combustible decorations. Do not use a gas heater inside a tent, canopy or on a balcony. Keep each propane cylinder at 20 pounds or less. Check your local fire authority’s rules before you buy, because the rules differ by place.

At a glance: what to check before you heat a patio with gas

Check Requirement
Heater listing Must be listed for outdoor use, with a tilt shutoff described in its manual
Clearance At least 5 feet from the house and from any exit
Surface Level, firm spot on the patio
Cylinder size 20 lbs or less, unless local permit rules allow a larger supply
Cylinder storage Outside the house, away from exits — a lockable, ventilated metal cabinet is suggested
Enclosure Not under a tent, canopy, or on a balcony
Permits Ask your local fire authority before setup
Recalls Check whether your model is named in a recall before lighting it

This guide does not name any specific heater product — these are the setup requirements described in the guide’s own sources section, not specs from a listing.

What the sources say, and what they do not

The main source is the Fairfax County Fire and Rescue Office of the Fire Marshal guidance on portable outdoor gas heaters. The page shows no publication date. It applies in one county, so treat it as an example of local rules, not a national standard. It says:

  • Only listed and approved units may be used, and they must be installed and maintained as the manufacturer directs.
  • The heater must be at least 5 feet from buildings and from exits or exit discharges, and must not be placed beneath, or closer than 5 feet to, combustible decorations.
  • Use or storage is prohibited inside tents, canopies and membrane structures, and on exterior balconies.
  • The unit needs a switch that shuts off the gas when it is tilted more than 15 degrees from vertical.
  • The heating element or combustion chamber must be guarded against accidental contact.
  • Only approved DOT or ASME cylinders may be used, each no more than 20 pounds. Cylinders must not be stored inside buildings or near exit doors.
  • A fire permit is required when more than 10 gallons (42.5 pounds) of LPG is stored or used outside.

The second source is a 2025 federal recall notice from the Consumer Product Safety Commission. It covers one 70,000 BTU propane heater model sold at a big-box retailer. The recall says the operating instructions could lead users to press the start button too quickly, which can stop the fan from starting and let the heater overheat. The notice tells owners of that model to stop using it and contact the maker for new instructions. It applies only to the model it names.

The sources do not cover electric patio heaters, and the Fairfax page does not address leak testing. For those points, follow the manual. The sources also do not give heat output for any size of patio.

What you need

  • A heater listed for outdoor use, with the tilt shutoff described in its manual.
  • A level, firm spot on the patio, with the heater at least 5 feet from the house and from any exit.
  • A cylinder of 20 pounds or less, or a plan to use a larger supply only if your local permit rules allow it.
  • A cabinet or spot outside the house for storing the cylinder, away from exits. The Fairfax page suggests a lockable, ventilated metal cabinet.

Steps

  1. Check local rules first. Ask your fire authority about permits and any local limits.
  2. Choose a listed unit. Confirm it is listed for outdoor use and has a tilt shutoff.
  3. Pick the spot. Keep it at least 5 feet from the house, exits and combustible decorations. Do not put it under an overhang you cannot keep 5 feet clear of.
  4. Check the enclosure. Do not use it under a tent, canopy or on a balcony.
  5. Set up the cylinder. Use an approved cylinder of 20 pounds or less and store it outside, away from doors and exits.
  6. Follow the manual for start-up. If your model is named in a recall, follow the recall notice before you light it.

Worked example

This example uses our arithmetic and the 5-foot figure from the Fairfax page. Your patio and house will differ.

  • Patio size: 12 feet by 12 feet, so the floor area is 12 x 12 = 144 square feet.
  • Heater at the centre: each edge is 6 feet from the heater, so it passes the 5-foot rule from every side.
  • Heater 4 feet from the house wall: 4 feet is less than 5 feet, so this spot fails. Move it to at least 5 feet.
  • Cylinder check: a 20-pound cylinder is the largest the Fairfax page allows per container. A fire permit threshold of 10 gallons is listed as 42.5 pounds of LPG.

Who should skip a gas heater

Skip a gas heater if you want heat under a tent, canopy or on a balcony, because the Fairfax page prohibits those uses. Skip it if you cannot keep the 5-foot clearances on your patio. The sources we opened do not cover fire pits or electric heaters, so this guide does not recommend one over the other.

Mistakes to avoid

  • Placing the heater closer than 5 feet to the house or an exit.
  • Storing a cylinder inside a shed or near a door.
  • Using a heater under a tent or canopy.
  • Ignoring a recall notice for your model.
  • Skipping the manual’s start-up steps.

Products

This guide does not name any product. No Amazon listing was used.

Sources

Sources opened for this guide:

FAQ

How far should a patio heater be from the house?

The Fairfax County guidance says at least 5 feet from buildings. Check your local rules, because other places may differ.

Can I use a patio heater under a covered patio?

The Fairfax page prohibits use inside tents, canopies and membrane structures, and on exterior balconies. It does not decide the case of an open roofed patio, so ask your local fire marshal.

How big a propane cylinder can I use?

The Fairfax page allows no more than 20 pounds per container, and says approved DOT or ASME cylinders only.

Does a patio heater need a tip-over switch?

The Fairfax page requires a switch that shuts off the gas when the unit is tilted more than 15 degrees from vertical.

Related guides

For a propane heater that will not start, see Best Propane Patio Heater Won’t Light. For the cylinder size, see Best 20 lb Propane Tank for Patio Heater. For a standing model, see Best Legacy Heating Standing Propane Patio Heater.

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