/challenges-projects/design-challenges/experimenting-with-thermal-switches/b/challenge-blog/posts/energy-squeezer---blog-3In this post, I will provide some details about the first project for this challenge: a device to recover some otherwise-wasted heat from the boiler fumes 1. Fume energy extractor The heating system in my house has two main zones. Ground floor (whe.en-USTelligent Community 12