The Ontario Building Code | Showers showers

(1) Except as provided for in Sentences (2) and (3), all valves supplying fixed location shower heads, shall be individually pressure-balanced or thermostatic-mixing valves, conforming to ASME A112.18.1 / CSA B125.1, "Plumbing Supply Fittings".

(2) An individually pressure-balanced or thermostatic-mixing valve shall not be required for showers if a single temperature water supply for such showers is controlled by a master thermostatic-mixing valve conforming to CSA B125.3, "Plumbing Fittings".

(3) Deck-mounted, hand-held, flexible-hose spray attachments are exempt from the thermal shock requirements of Sentence (1).

(4) pressure-balanced or thermostatic-mixing valves shall be,

(a) designed so that the outlet temperature does not exceed 49°C, or

(b) equipped with high-limit stops which shall be adjusted to a maximum hot water setting of 49°C.