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https://www.ontario.ca/laws/regulation/r04023
7.6.5. Water Temperature Control
7.6.5.1. Maximum Temperature of Hot Water
(1) Except as provided in Sentences (2) and 7.6.5.3.(1), the maximum temperature of hot water supplied by fittings to fixtures in a residential occupancy shall not exceed 49°C.
(2) Sentence (1) does not apply to hot water supplied to installed dishwashers or clothes washers.
7.6.5.2. Showers
(1) Except as provided in Sentence (2), all shower valves shall be pressure-balanced or thermostatic-mixing valves, conforming toCAN/CSA-B125, “Plumbing Fittings”.
(2) No pressure-balanced or thermostatic-mixing valve is required for a shower if the hot water supply for the shower is controlled by a master thermostatic-mixing valve conforming to CAN/CSA-B125, “Plumbing Fittings”.
(3) 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 and adjusted to a maximum hot water setting of 49°C.
