Great concept to reduce the losses in transmitting and converting energy, and reducing the weight, complexity, and cost of the wind system. But there are issue

Great concept to reduce the losses in transmitting and converting energy, and reducing the weight, complexity, and cost of the wind system. But there are issues. 1) It takes a rather large system and stiff breeze, "a rotor diameter of 5 meters and a height of 9 meters – produced 3.5 kilowatt of heat at a wind speed of 11 m/s", ~25mph wind, to produce a modest heating output. that is the equivalent of two small 1750 watt heaters, which would barely heat a decent size room in cold weather. 2) The system is completely dedicated to heat production, and will be a waste of space over half the year. In the summer, most of the wind will be of essentially no use except for warm tap water. In contrast, you can use electrical generation any time. The best system I've seen of this was at a remote boarding school in Florida. On the roof, they had black serpentine pipes in flat black boxes with glass lids, so mini-greenhouses. In the utility area, they had large insulated water storage tanks. They could get the water to 180F, and had to warn people to be careful when using the tap or taking showers. Pretty impressive, and this was decades ago.