CO2 Heat Pump

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Operates at much higher pressure - 600-1800 PSI. COP is 4. [1]

Sourcing

SanCO [2]. Down to -20F. 5x more efficient than electric heat for water heating. Appears workable, ROI in 5 years, [3]. $5600 for a hot water heater. [4]
Goes down to -4F [5]

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