We originally had a failing oil boiler when we bought the house, along with a defective log burner. There was a tortuous water system with four tanks in the loft, which froze in winter.

Our bills are now less than 1/10 of what the house originally cost to run. It is definately not up to passive haus standards though.

The turbine was set up when there were good feed in tarrif rates and paid for itself in eight years from those alone. Not such a good return n a new one now. It does need maintenace every year, while the panels just need to be kept clear of snow etc. They are on a frame in the garden, noton the roof.

Robin