There are comfort and performance criteria for construction of hotels and tourist attractions. Val-Technik recognises that design and construction of the potable water system (cold water supply and hot water circulation) is no exception.

​

In the hot water circulation system, hot water leaving the calorifier must be a minimum of 60°C and return to at least 55°C. In some guidelines, the periods of waiting for the arrival of hot water after opening the tap shall not exceed 5 seconds for hotel bedrooms and 10 seconds for service areas.