Fast Heating Heater: This greenhouse heater quickly heats most small space areas of about 175 square feet, making it ideal for greenhouses and patios. Adjust the temperature from 40 F to 108 F (5 C to 42 C) to suit your needs. Dual Mode Heaters: Our electric patio heater are available in 25W fan mode and 1500W heating mode. This flexibility allows you to tailor the heater to the situation, whether it's for plants or personal comfort. Portable Greenhouse Heaters: This patio heater is designed to be compact and easy to carry. The 8-foot power cord and 0-90 swivel feature allow for easy use on patios, indoors, and even in garages, for any space, indoors or out.