Drainback System

• Usually installed in cooler climates

How does it work?

• Indirect pressurized system (fluid heated never comes in contact with usable water)
• The fluid is either a glycol solution or distilled water
• When pumps are off, the water drains back out of the collectors to the reservoir tank
• This keeps the collectors from freezing

• The Drainback System functions like The Direct System accept that the potable water is not the fluid that is circulated
• It uses differential controller to start the pump
• Sensors attached to collector detect useful sunlight available
• When the temperature in the collector is higher than temperature at the bottom of the tank the pump kicks on

• The system routes distilled the water from the tank to the collector on the roof and then back in continuous loop
• The heat exchanger is in the reservoir tank
• The pumps continue as long as sensors detect useful sunlight
• When not used, the water drains back to reservoir tank
• No water is left in collector

GREENERGY Flat Panel Collectors

• Thermafin manufacturing
• 10 year warranty
• Unique manufacturing process to weld copper tubing to copper strip and encapsulate the fin with a thin glass coating that will last for years with extremely high absorptivity rates