Hot and Cold Running Water, Epheseus
Using terra cotta pipes, the houses had indoor running hot and cold water, as well as heat.
In the public bath houses in Ephesus. It was built using cut marble and had three sections… fridgidarium (cold water), tepidarium (tepid water), and caladarium (hot water.) –
“But I will stay in Ephesus until Pentecost, for a wide door for effective work has opened to me, and there are many adversaries” (1 Cor 16:8-9).
http://sherwingoerlitz.blogspot.com/2013/08/ephesus