A house built to passive house standards requires less than 10w per sqm of peak heating demand, a 500w toaster will warm 50sqm, which is a decent room already.

There are passive houses built at 2000m altitude in the Alps, some are made of wood and have literal strawbales for insulation, there are no excuses left in 2026 not to build good houses, it's more economical, more practical, more comfortable, more ecological

You could put that 500W into a heatpump.