Its sounds like you are perfectly suited to a heat pump. As much as I hate saying hit the search button , there has been a few good conversations recently ( say over the last 12 months ) about heat pumps. Its an option I will be going with when my current cheap crap gas hot water system blows up ( its 3 years old , I will give it another 2 )
I found some good info here a while ago about how they work and under what conditions
I did attempt to get one a while ago under government grants but I wasnt elligable for one of them so that was the end of that.
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