Hot radiator that measures water temperature

The Hot Radiator notifies the user if the water is hot or not. Letter “Hot” in plain white means the water is cold and vice-versa when it turns red. No more pulling your hands back and forth to know the water temperature, when a glance can do it all.
Radiators are heat exchangers used to transfer thermal energy from one medium to another for the purpose of cooling and heating.

Via: Gearfuse