Thermostats contain mercury. Mercury is a bio accumulative, persistent, and toxic heavy metal that threatens the health of humans and our ecosystem.
Older mechanical thermostats can have 1 to 4 mercury switches, each containing approximately 2.5 grams of mercury. Just one gram of mercury can contaminate an eight hectare lake to the point where the fish in that lake are not edible for one full year. In an effort to mitigate the impacts of mercury pollution, mercury-laden fish consumption warnings are now issued for 90% of lakes in Ontario, Eastern Canada, the Northeastern United States, and the U.S. Midwest.