3.5 years and my heat exchanger is leaking. Mainte...

3.5 years and my heat exchanger is leaking. Maintenance regiments alone were not enough to get this type of a heater to the life expectancy of a traditional water heater. I love the space saving aspects and the endless hot water, but I can't recommend this product. I've been through a lot with the heater, rebuilding it with Noritz provided warranty parts, and to be fair they invest some time in customer support, but it's been a big investment (WASTE) of my time and money.