The Ontario Building Code | Maximum Temperature of Hot Water
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.
In Plain Language
Hot water delivered to fixtures used by people, such as lavatories and showers, can't exceed a maximum specified temperature, protecting against scalding injuries.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.