A standard 9kg or 13.5kg LPG or propane cylinder, which sits inside the body out of sight. You will need the correct UK propane regulator and hose - these are not supplied with the heater. It will not run on natural gas or butane.

At full 40MJ output a 13.5kg cylinder gives roughly 15 to 18 hours of running; turned down towards 23.5 MJ/h it will stretch considerably further. In practice most people get several evenings from a bottle, and keeping a spare is sensible if you use it regularly.

Better than most. The contoured body was designed for wind resistance rather than being an open reflector, and the 700mm square base with a full cylinder inside gives it a low centre of gravity. The anti-tilt switch cuts the gas if it is knocked. In genuinely strong wind, shut it down and store it - that applies to any freestanding heater.

Under an open-sided veranda or canopy, yes, provided there is a minimum of 1000mm between the top of the heater and the roof and free air movement through the space. It must never be used in an enclosed room or a fully sealed garden room, because it is a flued-free combustion appliance.

It puts out considerably more heat than any single 230V electric heater and needs no wiring, which makes it the obvious choice for a garden with no power at the terrace. The trade-offs are cylinder changes, less precise control, and the fact that it must stay outdoors or under an open canopy. If you have power and a covered space, an electric Tungsten or Platinum is tidier.