i put in a heat pump water heater at my old place in seattle. 60 gallon tank, which was the size of the previous electric model. i found that it could not keep up with demand if there was more than 1 bath taken (kids + someone else). garage was probably only ever as cold as 5C (40F), if that, and it really struggled. it was loud too, to the point i could hear it through the floor into the bedrooms above. even in electric mode, it didn't seem to pass the test. and the various modes it had didn't seem to make a difference. i might've saved $10-20/month on DWH bills, but that's a long time to breakeven on the increased purchase price.
in my home that i will be constructing shortly, it'll be passive-house-level airtight and very well insulated. most people go for the heat pump DHWH and ductless dryers, but i can't bring myself to do that. i'm thinking in 10 years these might be ready, but they're not now. maybe if you lived in the southern half of the US where you could put this thing somewhere hot (garage, attic), would it really pay off...