Watts 0212027 5-Gallon Potable Water Expansion Tank Deta-12

The Watts 0212027 Potable Water Expansion Tank Deta-12 is used to deal with the excess water that expands when heated in a closed-loop water element and may hold up to 5 gallons to accommodate the pressure changes during temperature variations. It operates by taking in a better volume of water into an internal air chamber, which is divided by a diaphragm, to eliminate the build-up of excess pressure in associated piping systems in HVAC systems. It is used in hydronic heating units and drinking water lines and helps maintain a steady balance of pressure.