Air Tap is a hot water heater retrofit heat pump. It cuts your hot water heating energy consumption by 70%, and only costs $700, so the typical family of 4 will recoup costs in less than 2 years.
Heat pumps use the latent energy from the air to heat the water, and are inherently 2-5 times more efficient than other methods of heating. It works well in the Seattle climate since our temperatures are pretty mild year round.
Pretty cool.
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