(1) A water distribution system supplying hot water to any bathtub, shower or hand basin that is accessible to a patient or resident in a Group B, Division 2 or 3 occupancy or a resident of a group home, home for special care or residence for adults with developmental disabilities shall have one or more temperature gauges and control devices that are,
(a) accessible only to supervisory staff, and
(b) capable of being adjusted to ensure that the temperature of the water supplied to the fixtures does not exceed 49°C.