Immersion heater or gas boiler for energy savings?

[Jonboy13]

I am trying to reduce my energy bills (aren't we all!) and was wondering if it's cheaper to heat my hot water with the immersion heater or using the gas boiler. Obviously as it's summer the rads are off right now so there's no need to fire up the boiler unless I need hot water. I have an indirect cylinder by the way (water can be heated by both element and coil). Water is heated for about 1 hour once a day.

Anyone know which method is cheaper to run when the rads aren't on?

Thanks,

Jon
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