Many modern patio heaters now have a simple knob that allows you to adjust the flame. This is excellent for greater control as well as temperature regulation. If you want this feature, look for propane or natural gas patio heater with an adjustable knob. It should have electric ignition- but not all patio heaters with electric ignition can adjust flames. If you don’t have it, it’ll be up to you to light your patio heater and hopefully control it well.