The Haier Monoblock Heat Pump Water Heater uses R290 which has a global warming potential (GWP) of 3. Many heat pumps use R134A. R290 has a global warming potential that is 476 times lower than R134A. As many refrigerants are strong greenhouse gases, the use of refrigerants with low GWP is seen as a way to minimise the effect of refrigeration systems on global warming.

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