Why, with the cost of home heating these days, has the US not discovered the Kachelofen?

The principle has been around since Roman times. They have been traditional ways of heating northern European homes since the Middle Ages. They are incredibly fuel-efficient and provide even, safe heat. Kachelofens, more kachelofens, more kachelofens, and still more!

They are making a major comeback in Europe and the varieties of design are endless. Modern kachelofens are usually custom designed for the intended space.

This is both their glory and a weakness—because they are very expensive. But, the money upfront will work itself off with energy savings over the long term.

Still, why have not US masons and ceramicists/potters gone into business together and started making these?