Water Tanks (Thermal Mass)

The humble water tank is the workhorse of thermal storage: cheap, safe, and effective, sensible water storage underpins most building heat and hot-water systems. Getting it right matters more than its simplicity suggests, because a poorly designed or badly connected tank can waste much of the value it should deliver. This lesson covers why water, the roles a tank plays, the stratification that determines its real performance, and losses and sizing.