To heat up the water of my hot tub in the winter, I've build a pellet heater.
In order to keep costs low, some parts are not optimally designed, for example the heat exchanger.
But so I managed to build the heater for under $ 300.
https://youtu.be/XJz8seM8hDw
https://youtu.be/Hx4eZ4Azdr8
https://youtu.be/9OGTvweuXww
