Up on Orkney we use propane for the cooker, electric for the ovens and grill. Multi fuel in the living room which spreads throughout the house in the day. (But coal mostly) We have an oil burner for central heating and the cost of oil has more than doubled in the last three years. (there is an immersion for hot water if we use more than the oil heating produces...rarely) It's a big house in a very windy spot. It's old even and with the latest standard double glazing a bugger to heat up. Our neighbours have just fitted solar panels (16 of them) They now have their house red hot and get paid for it !! (Envy, envy...haha) The point of this is that we have an old fashioned non condensing boiler (Rhino) It is only three years old and cost around £700. It runs very efficiently and we use around 1600-1800 litres a year. (7 rooms and two bathrooms). Have you thought about ground source heat pump even with the problems you outlined? They work well up here and in Shetland. Our neighbours would have had a wind turbine but it would have been too close to their house.(You have to accept the noise) From those people I know with wind turbines, they are laughing all the way to the bank. You can get automatic switching. Good luck