Patio heaters are a great way to heat your outdoor space safely. They have many safety features built in to protect your family. Most patio heaters have a tilt shut off valve. Be sure to give adequate space between the patio heater and any combustibles. Always consult your owner manual before installing your patio heater. For patio heaters between 30,000 and 50,000 BTUs, provide at least 30 inches of clearance above and on all sides of the reflector and emitter head from combustible materials. Smaller units from 10,000 to 30,000 BTUs need at least 24 inches of clearance above and on all sides of the reflector and emitter head.