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There are three major types of coatings on absorber plates in an air collector. First type is coated with black paint and is about 10% efficient. The second type uses semi-selective paint and can achieve up-to 45% efficiency. If this is hand sprayed you will probably get about 15% to 20 % efficiency at best. Third type is selective surface. This is a highly controlled process and will deliver from 88% to 96% efficiency depending on the type of selective coating. A Northern Comfort tm. Absorber is made of copper and is coated with TINOX tm. Titanium-Oxy-Nitride with a proactive Quartz coating. The first environmentally friendly coating that pollutes neither air nor water and is 96% efficient.
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