The potable water supply to all boilers other than one- and two-family dwellings shall be protected by an approved air gap or a reduced pressure principle backflow preventer. When boilers in one- and two- family dwellings have chemicals introduced into the system, the potable water connection shall be protected by an approved air or a reduced pressure principle backflow preventer. The potable water connection to the boilers in one- and two-family dwellings without chemical additives shall be protected by a double check-valve assembly with an intermediate atmospheric vent.
(Ord. 3630, passed 12-13-2004)