WRAS G18.5 Terminal fittings or communal showers in Schools or public buildings and in other facilities used by the public, should be supplied with water through thermostatic mixing valves so that the temperature of water discharged at the out lets does not exceed 43 degree's C. So I get the general idea, but where is the cut off point, because Hotels are facilities used by the public so they would be required to have mixing valves in the bar toilets or the spa/health club changing rooms. Does this also extend out to the accommodation rooms?