SunEarth Inc - Quality Solar Water Heating Products

SunEarth Inc - Quality Solar Water Heating Products

CopperStor Drainback Vessels


The CopperStor represents a cost effective advance in drainback tank design. Fabricated from spun-end seamless copper tubing with no ferrous metal components, the CopperStor is nearly impervious to corrosion and allows for direct sweated connections without the need for troublesome dielectric unions. High temperature 15% silver brazed joints ensure high strength and are not affected by lower temperature flames used for sweating the connections. A 3/4″ brass cap on the top of the units creates a simple and cost effective method for checking the fill level with a dipstick. CopperStor tanks are finished with a water-based matte black paint and wrapped in 1/2″ Rubatex insulation to minimize heat loss and sound.

CopperStor drainback tanks have been designed for use with the SunEarth Cascade OG-300 solar water heating system, but they may be incorporated into most other professionally engineered drainback systems.

Product Images
DB-5 DB-7.5

Tank Specifications

SunEarth Model Number Width (in) Length (in) Depth (in) Dry Weight (lbs) Fluid Capacity (US gal) Wet Weight (lbs) Max Pressure (psig) Connection Pipe Dia. (in)
DB-5.0 12 50 5 42 5.0 82 160 3/4
DB-7.5 18 50 5 56 7.5 117 160 3/4
DB-10.0 24 50 5 84 10.0 164 160 3/4

Typical Applications

CopperStor drainback tanks can be seamlessly coupled with the Ruud HE tanks to create a drainback version of our popular SolaRay closed loop design. Using the Ruud HE tank eliminates the need for the second pump on the potable water side that adds both cost and complications found in other drainback designs. The CopperStor drainback tank can easily be hung from the wall adjacent to the Ruud HE tank for easy and unobtrusive installation.

For retrofit applications where it is not economical to replace the existing storage tank, the Copperstor may be used in combinations with our SunPlate heat exchangers and a pump on the potable water side to convert existing solar systems to freeze-proof drainback designs.

New Installation

New Installation Cascade Drainback System

Retrofit Installation

New Installation Cascade Drainback System

Product Images