http
:
//
eu.sanyo.com/
AssetBrowser/
Air%20Conditioning%20Docs/
Brochures/
SANYO_CO2_ECO_Heating_System_v1.pdf

Note it is 3.6 Mb. See page 11.
65degC output temp
At +7 degC air temp the COP is 3.1
At -15 degC air temp the COP is 1.8

So maybe not as efficient as HFC above zero air temp, but producing 65 water output temp must affect it.