It's a singularity, nevertheless charming.
Of course that needs maintenance, alike a conventional heating installation as well, and the pricing is somewhat prohibitive.
But for to start up with some of these ideas it's an impressive approach, at least for lodges in the woods or desperate islands
.
Btw they have upscaled the system for urban quarter (see ref.)
Arguing basically on monetary reasons is reasonable, but should not neglect forecasting.
I've divorced myself and house from oil, needed some 50 K€ for it, and have to do some woodwork since to get warm @ in winter, but don't regret, because it was based on my convictions. But that's half way, because re-cycle of carbon.
My next step for climate so will be excluding carbon for energy generation completely, but these techniques just may evolve the next years so to be installable in broad.