Electricity costs?

[crash999]

We have a Crusader Lite 30BH here in the UK and yes Electricity costs are an issue here.
We turn off the electric water heater at night and find the water has gone cold by the morning. In other words the insulation around the hot water tank is rubbish. Is there any way of getting to the tank to provide better insulation?
Please note we are having issues with the gas burner and am awaiting a remedy, its unstable and noisey.

[Stripit]

Paying $1,350 for a month in San Diego but that includes the electric as no meter on any sites. Included in that is the $1.00 per day for a dog.