Section 8 AAC 80.070 - Low-water fuel cutoff(a) An automatically fired steam boiler must be equipped with an automatic low-water fuel cutoff with manual reset.(b) An automatically fired hot water heating or hot water supply boiler that exceeds an input of 400, 000 Btu per hour must be equipped with an automatic low-water fuel cutoff or a loss of flow switch, as appropriate for the heater or boiler.Eff. 6/21/84, Register 90; am 12/17/99, Register 152; am 4/24/2020, Register 234, April 2020