China uses it for bathing, Sweden and the U.S.A. use heat pumps and Turkey and Iceland use it for district heating.

 A 3-ton slinky loop prior to being covered with soil.  

The three slinky loops are running out horizontally

 with three straight lines returning the end of the

slinky coil to the heat pump



Biomass fired district heating power plant.



  

Country	Production PJ/yr	Capacity GW	Capacity Factor	Dominant applications
China	45.38	3.69	39%	bathing
Sweden	43.2	4.2	33%	heat pumps
USA	31.24	7.82	13%	heat pumps
Turkey	24.84	1.5	53%	district heating
Iceland	24.5	1.84	42%	district heating
Japan	10.3	0.82	40%	bathing (onsens)
Hungary	7.94	0.69	36%	spas/greenhouses
Italy	7.55	0.61	39%	spas/space heating
New Zealand	7.09	0.31	73%	industrial uses
63 others	71	6.8
Total	273	28	31%	space heating