According to Gary Klein, hot water is where it's at, or rather, where all the energy use is at. He says so much energy is expended obtaining water, heating it and distributing it that it is one of the most important factors in creating an energy-efficient building. He examines all the variables in hot-water use, diagrams plumbing layouts, looks at people's needs, and at patterns of use, and then tries to show how to create a system that will solve all the problems.

Here is his contribution to the plenary session of the Hot Water Forum.

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