The answer to 'what is water heater' is a household appliance that heats and stores water for domestic use. Water heaters come in various types, including conventional storage tank heaters, tankless or on-demand heaters, and heat pump water heaters. They use different energy sources such as electricity, natural gas, or propane to heat the water, and they play a crucial role in providing hot water for showers, laundry, and other household needs.
Water heaters are an essential component of a home's plumbing system and require regular maintenance and occasional replacement to ensure efficient and safe operation. Proper selection, installation, and care of a water heater can help extend its lifespan, improve energy efficiency, and prevent costly water damage or safety issues.