Its 180L so should be OK for my usage. I just thought they would want to pair it with the ASHP and keep it the same manufacturer. I wonder if they could supply the mixergy heat pump kit within the BUS grant? Although it is only about £400.
Im looking to DIY an ASHP. Did you need anything additional for the unvented cylinder install (G3)? I already have a mixergy but assume they would want to use a their cylinder! Did the Vaillant come with all the controls etc in the package?
Thanks