Section 658-109-7 - Low Water Control for OIL FIRED Boilers1. All oil-fired boilers shall be provided with a properly installed and operating low-water control.2. The low-water control may be installed in, or attached to, the boiler at the level recommended by the boiler manufacturer, but in no case shall the low-water control be installed below the crown sheet. The low-water control, when not installed directly in the boiler, may be installed either in the main supply line (Vertical riser) as close to the boiler as possible or in a water column of continuous piping attached directly to the boiler.3. The low-water cut off shall be designed and approved for the medium used (steam or water).4. No valves or other obstructive devices shall be installed between the boiler and safety controls or devices.02-658 C.M.R. ch. 109, § 7