Photo: Wikipedia , CC “Carbon dioxide emissions will be cut by 164 million metric tons over 30 years.” Heating water is one of the most energy-intensive (and thus polluting) things that takes place in the average house or apartment building. There are two main approaches to make it greener: We can use less hot water in the first place (shorter showers, making sure the dishwasher is full, wash clothes in cold water, etc), and we can improve the water heaters themselves so they’re more efficient….
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US Department of Energy Announces Stricter Efficiency Standards for Water Heaters
