![](http://www.alamy.com/thumbs/6/8241ADD6-72A9-4C5C-8360-DB84BCDF00A6/D9EHBY.jpg)
Heating thermostat on step 3
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Photo credit: © Bildagentur-online/McPhoto-Richter / Alamy / Afripics
License: Licensed
Model Released: No
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