I have had an InSinkErator Hot Water Dispenser for about 10 Years. in the 10 years I have had to replace the compete unit because the old one leaked and they redesigned the unit. The new unit lasted about 2 years and was replaced under Warranty. After the warranty was up the unit went out again. Once again the unit has been redesigned and a new tank cost $398.00. I was able to get one for $138.00 using a Promo Code which is the only reason I replaced it again. The Tank does not leak, but because of a bad design, the check valve is built into the tank and it goes bad. If the valve was external, it would have been a quick and not very costly repair. I love the unit when it works, but most likely will not spend the money again. Too expensive if you have to replace the Tank and Dispenser would be around 5 to 6 hundred dollars.