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Hey, I just had a quick question about the glass. I've got a very similar design in mind for a solar water heater and I've been debating a few things. Ideally I'd use tempered glass but the price is just crazy. I'm trying to decide between non tempered glass cut to size, or using acrylic. I'm concerned both about the acrylic in the uv and the elements, and about the temp inside the box shattering the glass. What was your thoughts?