Options for replacing an immersion tank

WoolyJumper

So recently purchased a small 1bed 1 bathroom flat and the old immersion tank needs to be repalced. Seeing as it needs to be replaced I am also considering alternatives. Basically whatever will be the most efficient and cheapest in the long run to heat my water. The flat is all electric. The bathroom and kitchen are next to each other and both pretty small so there isn't a big distance the bathroom sink and kitchen sink. Bathroom has a bath that I plan to eventually replace with a shower and there is already an electric shower installed above the bath.

Initially I was thinking replacing the large immersion tank with a smaller one that will do for the two sinks as the bath won't be used. I figure this would be cheaper and more efficient that heating a large tank.

Alternatively I'm thinking an instant water heater that would heat the water in the sinks as needed. Sinks would only be used for washing hands etc. Is it possible to get a tank like this that could feed the two sinks and would this be a potentially cheaper option overall?

Lastly, someone suggested sticking with a larger more efficient tank and ditching the electric shower for mains fed shower with thermal taps installed which in theory should allow for better water pressure than an electric shower (Keep in mind, the bathroom will need to be renovated eventually and that will likely include replacing the electric shower so installing a thermal shower instead may not be a big extra cost)

As much as I like good water pressure my priority is keeping my bills as low as possible given the entire flat is electric. Im open to any and all suggestions.

Lenar3556

Replacing the cylinder on a like for like basis will probably be the most cost effective option. A smaller cylinder may have a little lower heat loss than the current one, but it will be quite a small difference.

The alternative shower proposal you mentioned will give you a better shower experience without doubt, but at a significant cost - both install and running costs vs current electric shower.