Pull switch setting We believe that more primitive operation can ensure the stability of the product better. Instead of using a propane or oil-fired patio heater to warm up your patio, this heater uses regular household electricity and is less expensive to operate than a propane patio heater. The heater generates 1500W of heat. It can be used indoors as well as outdoors. This is the perfect way to easily bring the heat where ever you go. Every product is carefully tested by quality inspectors before packaging. We always strive to bring our customers higher quality products.