No, the requirement to ensure that the temperature of the water delivered to a bath is no more than 48 degrees celsius temperature applies only to baths in new homes (including those created by a change of use), not in existing homes. However, people may want to consider the potential safety benefits of fitting a TMV, or some other means to prevent scalding, when they are adding a bath or having an existing one replaced or repaired, particularly where occupants are known to include those most at risk from scalding, that is, the very young and the very old.