Designing a More Efficient Home Heating System with Closed Combustion

https://firesideprojects.birchreport.com/posts/designing-a-more-efficient-home-heating-system-with-closed-combustion

I redesigned my home heating system to use closed combustion, and the difference is huge. By sealing off the burn chamber from the room air, there is no more drafty heat loss or risk of backdrafts. The system now draws oxygen from outside, so the flame burns hotter and more completely. My fuel bills dropped noticeably, and the house feels consistently warmer without cold spots near windows. It is a practical upgrade that boosted safety and efficiency without a big renovation.