The air-source Heat2O is said to deliver a COP up to 4.11.
The system is aimed at restaurants, small grocery stores and cold rooms, initially in Sweden.
New owners John Miles and Maho Ito will focus on selling the ECO2 systems in North America.
With plans to convert its entire portfolio to hydrocarbons and CO2 by 2022, OEM Sanden Intercool Group is targeting its home market in Thailand and the region.
Dave Sweet has made Sanden units, which supply space and domestic water heating, part of his very green Connecticut home.
As buildings seek alternatives to fossil fuels for heating, heat pumps using CO2 are finding a growing market in North America.
Among the companies exhibiting at Venditalia, there was not yet a clear trend towards adopting CO2 or hydrocarbons as the natural refrigerant of choice.