Solar Water Heater Evacuated Tube

evacuated tube
rods used to transfer heat from the heat surface area to a storage/exchange unit, and to your shower, pool, etc. Fluids are used to keep the water above freezing levels.
The absorber tube in a solar thermal collector through which collector fluid flows.
Solar water heating (SWH) systems are a mature renewable energy technology which have been accepted in most countries for many years. SWH has been widely used in Israel, Australia, Japan, Austria and China.

water heater
Water heating is a thermodynamic process using an energy source to heat water above its initial temperature. Typical domestic uses of hot water are for cooking, cleaning, bathing, and space heating. In industry, both hot water and water heated to steam have many uses.
An appliance for supplying hot water for purposes other than space heating or pool heating.
a heater and storage tank to supply heated water

solar
Relating to or denoting energy derived from the sun's rays
Of, relating to, or determined by the sun
relating to or derived from the sun or utilizing the energies of the sun; "solar eclipse"; "solar energy"
"Solar" is a musical composition attributed to Miles Davis on the studio album Walkin', considered a modern jazz standard. There is disagreement concerning the exact pronunciation of the tune (|?sol?r| or |?solar|).
Solar is an American fictional comic book character. Originally known as Doctor Solar, Man of the Atom, he first appeared in a comic book published by Gold Key Comics in the 1960s.