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Patio Electric Heater Patio electric heaters are a modern way to extend outdoor living spaces. Electric models emit no carbon monoxide and can be installed in enclosed spaces with no ventilation. To determine the power (BTUs) needed to warm your space, take note of the cubic footage of the space and the degree of temperature rise you want to achieve. Power Patio heaters are ideal to keep outdoor living areas warm and comfortable as the sun sets and temperatures cool. They work by emitting radiant heat to surfaces and objects around them. Electr