Has anyone done a costing over (say) 10 or 15 years to compare the cost of gas central heating/cooking vs off-peak electric heating/cooking. I automatically assumed that gas would be cheaper by far but what if you take into account installation and maintenance costs which can be high for a gas central heating system (e.g. annual boiler servicing, pump/valves breakdowns) particularly when plumbers/CORGI installers need to be involved. Interested in people's views but more interested in hard facts.