[jwxr7]

Originally Posted by knowbodies

Here's a cheaper version that uses beer cans.
Beer Can Solar HeaterBeer Can Solar

Just remember to start your project with empty beer cans.

I looked at many designs including a 32 ft^2 active beer/pop can panel, but decided it wasn't enough cheaper to merit all the extra work cleaning, cutting, and sealing the cans together. In fact, it could be more expensive. I live in Michigan where drink cans have a 10 cent deposit, so getting 300 some cans isn't exactly the cheapest way to make an aluminum absorber, especially since we don't drink pop or beer in my house .