Millcreek • Like a lot of people who strolled past the tables and tents at Solar Day Salt Lake on Saturday, Bill Hahnenberger didn’t come looking to buy anything.

But he did leave with a brochure for a simple solar heat collector box that could assist his gas-fired water heater and save some money. The company selling them charges $700 for a 40-gallon tank and $1,100 for an 80-gallon tank, and Hahnenberger figured it might make sense, especially because he has a hot tub to fill.

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