Have you looked into a solar PV battery instead? No cylinder needed, top it up overnight on an economy tarrif in Winter. Instant hot water with no standing losses: https://www.youtube.com/watch?v=D3_VgxsOxoE
Will have look but the solar battery costs look to be around 7k.... the 300l unvented cylinder is around 2k installed.
@mi7rennie started
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Have you looked into a solar PV battery instead? No cylinder needed, top it up overnight on an economy tarrif in Winter. Instant hot water with no standing losses:
https://www.youtube.com/watch?v=D3_VgxsOxoE