This was a replacement purchase, since the unit that we had installed when we renovated our kitchen 12 years ago finally succumbed to calcium deposits caused by our hard water (to be clear, the hot water was fine, but the cold water flow had dwindled to a trickle). Thumbs up to insinkerator customer service, who offered a replacement at a discount-to-market. I removed the old unit and installed the new one in less than an hour and it works like a charm! We are thrilled to have this terrific appliance back in service. It's really a joy to serve hot tea or instant oatmeal without having to wait for water to boil. The filtered cold water is used constantly, as we are big water drinkers. Excellent product and customer support!