Backflow prevention devices protect potable water, while thermostatic mixing valves control temperature. Storage solutions include rain barrels, cisterns, bladder tanks, and chemical feed tanks. Drain components include P-traps, S-traps, air admittance valves, cleanouts, and vent stacks. Water conservation technologies encompass leak alarms, water budget tools, fixture flow restrictor... https://homewatertech.com/best-outdoor-tankless-water-heaters-reviewed/