Справочник Пользователя для Rheem Electric Domestic Water Heater

26 

EXPANSION CONTROL VALVE 
Local regulations may make it mandatory to install an expansion control valve 
(ECV) in the cold water line to the water heater. In other areas, an ECV is not 
required unless the saturation index is greater than +0.4 (refer to 

 on page 33). However, an ECV may be needed in a corrosive water 

area where there are sufficient quantities of silica dissolved in the water. 
 
The expansion control valve must always be installed after the non return valve 
and be the last valve installed prior to the water heater 

valve.