18-28-1009.1 Where required.
   An expansion tank shall be installed in every hot water system. For multiple boiler installations, a minimum of one expansion tank is required. Expansion tanks shall be of the closed or open type. Tanks shall be rated for the pressure of the hot water system. Expansion tanks for systems designed to operate above 30 psi shall be constructed in accordance with the ASME Code, Section VIII, Division I.