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Choosing Waterproof Electric Patio Heaters The heat output of the patio heater is measured in British thermal units. The higher the BTU is, the greater the surface area that can be heated by a heater. It's an excellent idea to determine the wattage and power consumption of your heater. It is also important to take into consideration how much space your patio heater will occupy, especially if you're limited in space. Eco-friendly Business and home owners alike are concerned about the environmental impa