Husband installed fairly easy to fridge copper line.  Avalon has great customer service.  We did have a problem with the cold button would stay in the down position with water not shutting off.  Avalon, once again was extremely helpful with resolving this issue.  As far as the function of the cooler, it delivers cold fresh water.   Hot on demand and cool button if cold is too cold for you.  No more bottles, no more waste.  4 star because we only installed 1 1/2 weeks ago.  Hope this is helpful.