My unit was purchased in March of 2014 from https://shop.truckmountforums.com in Atlanta. This was just after they just updated the heat control from the thermostat to the low, medium and high settings. I have gone thru 6 heat switch sensors (low, medium, high replaced all twice while under warranty), thermal valve, and a waste tank shut off switch after the warranty expired, these are normal wear parts so I can't fault sapphire for those going bad, that just happens over time. When my warranty expired the unit had 1100 hours or so.Russ I noticed on your pic that you have SS 370. What is you take on SS so far. I have never used their TM but from what I can see on forums and social media pages issues with SS TMs come up more than any other TM. Now this is just what I have seen so far. Never used one and cannot speak on that. I rarely see any Prochem ever come up with issues.