Water heater installation involves setting up a device that heats water for residential or commercial use. This process typically includes selecting the right type of heater, such as a tankless or traditional tank model, and ensuring proper connections to the plumbing and electrical systems. Before installation, it's essential to turn off the water supply and electricity or gas to the existing heater. The new unit is then mounted, connected, and tested for leaks. Proper installation ensures efficient operation and compliance with local building codes, providing hot water for daily needs.