To accommodate the increase in pressure caused by thermal expansion within a closed water system, one of the following should be installed:
(1) a suitably sized diaphragm expansion tank designed for use within a potable water system,
(2) an auxiliary thermal expansion relief valve (T.E.R. valve) conforming to CAN/CSA-B125.3, “Plumbing Fittings”, set to a pressure of 550 kPa or less and designed for repeated use, or
(3) other means acceptable to the authority having jurisdiction.