Sure, I could get something like this combination bistro table and patio heater, but I've already got a table. And on a small condo balcony, a full-sized standing patio heater can be a bit of a space hog.

Perhaps I need a small patio heater that clamps to my existing table. Fortunately, there are just such things out there.

The Mini Tech 'Infra Red' Table Patio Heater clamps to your tabletop and emits a 3-4 meter radius of heater. Perfect for outdoor dining in the spring and fall months.

The heater runs on a bottle of propane and isn't supposed to waste any of that gas when converting it to heat. You get about 100 hours of running time for a 13kg bottle of propane.