Heating, Cooling & Refrigeration · Recorded milestone
CO2 heat-pump water heater
Recorded year2001
Japan's EcoCute heaters, first from Denso and Tepco, use carbon dioxide as refrigerant to heat household water efficiently.
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Led to
No connections of this kind are recorded.
Sources & evidence
Dataset updated 2026-10-18. This individual record has not been separately re-reviewed.