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System.Thank you. I did think 37kw was excessive. I think final question is really regarding which boiler and system or heating only.
If it was me, i'd go for the Vaillant EcoTec Plus 630. In doing so will allow you to use the Vaillant controls which will do HW priority.
You will probably want to allow for some extra expansion too with the volume of water.
37Kw would of been fine tbh, as you've got to remember they have a 1:6 (or the newer models 1:10) modulation range. It isn't running at 37kw constantly.