Unscrew anode rod at the top of the tank and cheek its condition, replace if necessary. Remove any rust on the tank with sandpaper. Spray tank with high temperature flat black stove paint. Determine the inlet hole in the top of the tank. Screw an elbow on the end of the nipple.
Selective surface increases the collector's performance.
It should be applied just before the tank is installed in the collector for the final time. This avoids damaging the selective surface while handling the tank during the construction of the collector. The collector construction sequence is set out in easy to follow graphical steps on the next five pages. Cross sectional drawings of the collector on page 16 and 17 should also be referred to. Building two collectors should be a weekend project.