Yeah, those are defiantly for houses with water heaters. Just pulled of the covering of one at my house and looks the exact same. They do do a great job of spreading heat with out much air circulation. I would assume they would be great for what you are looking to do. There was article on overlcockers.com where a guy used a lot of copper tubing for his completely passive radiator, though I can't find it now....man I really hate trying to find old articles on overclockers.
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