Final answer:
Domestic hot water heaters come in types like storage tank, tankless, and heat pump water heaters. Tankless heaters heat water on demand, while heat pump heaters move heat from warmer to colder environments. Storage tank heaters store hot water for later use.
Step-by-step explanation:
Various types of domestic hot water heaters include A) Storage tank, B) Tankless, and C) Heat pump water heaters.
Tankless Water Heaters (On-demand)
Tankless water heaters, also known as on-demand electric hot water heaters, provide heat to water only when it is needed, making them energy-efficient. They don't store hot water but rather heat it instantly as it flows through the device.
Heat Pump Water Heaters
A heat pump water heater uses work to transfer energy from a warmer environment to a colder one, which is a more energy-efficient process compared to traditional methods of heating water.
Storage Tank Water Heaters
A storage tank water heater keeps a quantity of hot water in an insulated tank and is typically powered by electricity or natural gas. Energy efficiency can vary depending on the design and energy source used.