Mixergy with heat pump - Worth it?

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I don't have a tank atm, and my plan of action for the house is:
Solar PV + batteries
Then get an MVHR
Upsize my radiators
Then buy an ASHP and ditch gas entirely.
They say that the COP is improved by 5-10% but let's say that your COP is the UK average of 2.8. Would a COP of 3.08 really be worth it, if this tank probably costs a few grand?
Solar PV + batteries
Then get an MVHR
Upsize my radiators
Then buy an ASHP and ditch gas entirely.
They say that the COP is improved by 5-10% but let's say that your COP is the UK average of 2.8. Would a COP of 3.08 really be worth it, if this tank probably costs a few grand?
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