In the fiscal year 2019, the number of installed closed-loop geothermal heat pump systems in Japan amounted to ** units, making up the largest type of geothermal heat pump system. Open-loop systems followed, with ** units.
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Renewable Energy Institute. (August 18, 2021). Number of installed geothermal heat pump systems in Japan in fiscal year 2019, by type [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 27, 2026, from /statistics/1231827/japan-number-geothermal-heat-pump-systems-by-type/
Renewable Energy Institute. "Number of installed geothermal heat pump systems in Japan in fiscal year 2019, by type." Chart. August 18, 2021. ÌÇÐÄÆƽâ°æ. Accessed July 27, 2026. /statistics/1231827/japan-number-geothermal-heat-pump-systems-by-type/
Renewable Energy Institute. (2021). Number of installed geothermal heat pump systems in Japan in fiscal year 2019, by type. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 27, 2026. /statistics/1231827/japan-number-geothermal-heat-pump-systems-by-type/
Renewable Energy Institute. "Number of Installed Geothermal Heat Pump Systems in Japan in Fiscal Year 2019, by Type." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 18 Aug 2021, /statistics/1231827/japan-number-geothermal-heat-pump-systems-by-type/
Renewable Energy Institute, Number of installed geothermal heat pump systems in Japan in fiscal year 2019, by type ÌÇÐÄÆƽâ°æ, /statistics/1231827/japan-number-geothermal-heat-pump-systems-by-type/ (last visited July 27, 2026)
Number of installed geothermal heat pump systems in Japan in fiscal year 2019, by type [Graph], Renewable Energy Institute, August 18, 2021. [Online]. Available: /statistics/1231827/japan-number-geothermal-heat-pump-systems-by-type/
