It could be interesting in a smaller scale or off grid purposes, but you’d still need solar panels as a source.

I doubt it’s worth saving heat from a wood stove. It’d be better to burn less wood to begin with. Some of the modern pellet ovens are very efficient for that.

They use this system to convert excess renewable electricity to heat for storage to be used in the district heating system. There’s probably a lot of loss in comparison to a regular battery, so the point is to utilize excess the electrify. It makes perfect sense in Finland because their electricity is a lot cleaner than their heating.