electric water heater boiler change

[jgswright]

wondering if you lovely people can advise me the best option.
just moved into a 2 bed ground floor flat, electric only.
have a big water tank on econ 7 tariff. have to boost for about 4/5 hours to be able to fill a bath, so not the best.
would love to get rid of the water tank and get some storage space as well.
heating is wall plugged storage heaters so not connected to this.
what if anything can i replace the water tank with? that will provide a decent amount of on demand hot water?
probably could have explained this better but hope you know what im looking for.

thanks for any and all help

 

[ShaunCorbs]

Electric shower installed in the bathroom already ?

 

[Murdoch]

Why do you need to boost for 4 to 5 hours to heat enough water for a bath?

Do you not have economy 7 heating the entire tank every night?

 

[jgswright]

Electric shower installed in the bathroom already ?

yes electric shower already there

 

[jgswright]

Why do you need to boost for 4 to 5 hours to heat enough water for a bath?

Do you not have economy 7 heating the entire tank every night?

yes but just doesnt seem to do enough, have enough for morning shower but thats it unless i boost.
not sure if its the capacity of the tank or if its just the tank that needs a look at

 

[Murdoch]

Does your hot water tank have 2 elements? If it does , is the lower one connected to the E7 ?