I don't know what gas costs where you are, but in Aus it's _far_ cheaper to heat with natural gas than a heat pump (if you are on scheme gas anyway). From what I've observed, those that benefit most from the heat pumps are those heating with Oil. (which would be the case here if we still did that too).
Now, if you want to talk efficiency and CO2 then the heat pump wins, but nobody in their right mind pays more for less.
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