2021: Heatbit – electric heater that earns you money [An indiegogo, not actualized] (3 points, 5 comments) https://news.ycombinator.com/item?id=26121782

2026: Heatbit Says Your Water Heater Should Be Mining Bitcoin, and Now It Can (4 points) https://news.ycombinator.com/item?id=50233756