These units come with a constant pilot with manual piezo ignition for thermoelectric safety. Units have a maximum input rating of 225,000 BTU/hr. and a min. input rating of 50,000 BTU/hr. with a shipping rate of 27 lbs. The units are adaptable to most common central heating plants including up-draft gravity and forced circulation furnaces and boilers. The power burner design makes these units suitable for oil burner replacement.