My folks have a farmhouse, no CH, and they don't want any, and just have storage heaters and an old immersion heater. Their electric bills are in excess of £2000, which is crazy for 2 of them. Seen a lot on electric combi boilers, but they were looking to replace the immersion wither either 1) an electric instant type heater which supplies instant hot water to the whole house replacing the immersion or 2) under the counter water heaters to the main kitchen and bathroom.
Add to this, the water pressure is low as the feed comes across the farm 1/3 of a mile away!! They are also very wary of someone coming to them and giving advice for something they don't need.
Suggest you check that the immersion is fed by the same supply as the storage heaters (ie off-peak electricity/economy 7 or whatever it is called in their area). If it is, it is very unlikely they will make any savings by replacing with immersion heater with another form of water heating.
If it is not then getting the immersion heater onto the storage heater supply should be the first move.
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