1. Basics of sizing. Definition of requirements

1.1 General

• The needs of a DHW system depend on three parameters [1] : temperature of use, instantaneous flow rate, available volume. These values can vary according to habits, and even social context.

  • The temperature of the water used generally varies between 33 and 40°C (baths, showers) and 55°C (washing without detergent), with a statutory limit of 60°C, with the exception of kitchens or laundry rooms in public buildings, where DHW may be distributed at 90°C at certain points, subject to special signage