Baby formula kettle

Has anyone used something like this? Did it make your life easier? My baby prefers warm milk so right now I have to mix the formula then put it in the bottle warmer. This seems like it would eliminate a step since it keeps the water warm 24/7 after boiling to remove all the bad stuff in the water. Just wondering how practical it really is.

I’ve looked into the baby Brezza formula maker and I think the bad reviews about inaccurate water:formula ratios scare me too much so I’m looking for another alternative.