This is our second insinkerator under sink water heater - the first one, at a different house, just heats water and is terrific and going strong after a couple of years, and this recent one I bought with hot and regular filtered water, is even better. After years of happiness with your no nonsense garbage disposals, I looked at other brands for hot water on demand but came back to you. It is so worth it! Why did I wait to buy? Cost, I suppose. I use this for everything - pots of hot water for cooking vegetables, a way to kick start my pressure cooker, tea and tisanes, a quick way to juggle the right temperature for proofing yeast, it's all good.
I'm not terrifically excited about paying for each replacement filter but they are SO much cheaper than the ones for the previous filtered water AND I don't need to hire someone to change the fiddly filter. For the win, I get absolutely unlimited hot water. I just gave away my electric kettle.