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What is a water-saving four-function solar water heater?

What is a water-saving four-function solar water heater?

The natural circulation compact household solar water heater is generally composed of four major parts: a high-level thermal insulation circulating water tank, a flat-panel solar collector (or a vacuum tube collector), a floating ball supply water tank and a bracket system. The flat plate collector is connected with the high-level thermal insulation circulating water tank […]