Made some calculations what it would take to provide via a thermal accumulator the heat I currently supply to the basement of my house to keep it from freezing during winter. My logs indicate I use between 1500-2000 kWh per winter for direct electrical heating and the dehumidifier. The amount of heat can be provided by either 20 m³ water kept just below boiling, or 2 m³ NaCl also kept just below boiling. I don't have space for 20 m³, so molten salt it would be. Insulating something at 1600°C such that at most 500 W leaks out would be a challenge, as might finding suitable heaters and temperature probes, and regulating the heat output.. 🤔