The Rasmussen Safety Lighting Kits provide safety shutdown in the event of an interruption in the gas supply or flameout. They also provide a convenient means of lighting the main burner(s) and controlling the flame height. They are required for all propane installations, advisable for natural gas, and are required for installations in certain jurisdictions. This manual control has a max capacity of 150,000 BTUs/hour. To use it you turn the valve knob to light the main burner and adjust the flame height. Basic Manual Control (SPK1) - turn the valve knob to light the main burner and adjust the flame height. Is not upgradable to remote control. Has 150,000 BTU/hour capacity (up to 42" set size).