Drain-back principle
The drain-back principle was introduced to simplify the protection of the solar system against overheating of the storage tank and freezing of the collector. Closed loop Drain-back systems increase system durability, safety and reliability. The collector simply drains whenever the temperature in the collector falls below the temperature in the storage tank. In this way it prevents a reverse heat flow (and losses) and the collector to freeze. To prevent overheating the collector also drains if the temperature in the storage tank exceeds 85°C. In case of a power failure the collector will automatically drain and the system will remain in a safe situation until the power is restored. No other solar thermal system provides this level of reliability and safety
No chemicals
The collector is filled with water, no chemicals such as anti-freeze or anti-corrosion inhibitors are added to the primary collector circuit, the lack of oxygen (closed circuit as in any central heating system) prevents corrosion of the metal parts.
Life expectancy
The invention to seal the primary collector circuit from ingress of oxygen, extends the lifetime of the solar system to more than 25-30 years as is already proved with systems dating back to the late seventies using this system concept.
No pollution
No risk of polluting sanitary water due to the absence of any chemicals anywhere in the system, therefore no double wall heat-exchanger is required.
The ZEN drain back solar systems have passed all relevant product requirements and carry all main certifications.
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