Also the units cannot run continuosly for over an hour or they will shut down and flash the service code.
Dude, you're not even close to knowledgable. Take a back seat, the grown ups are talking. I have no interest in educating you or telling you the actual facts. I love the subpar plumbers out there that need tech support and a DVD in order to install a tankless heater. :no:
Hear's a little piece of advice, talk less listen more.
A properly installed Noritz heater will operate for a period of 24 consecutive hours. After that, they will simply stop firing. They will then close the bypas valve for unrestricted flow of cold water. This product change came about early 2008 in the second revision of the 7 series units. There will be no error code displayed.
If you were actually qualified to install these things, you would still not know that. However if you were qualified to install these things, you would have a little tech's book that would have very clearly addressed all that we spoke of. You would also have all the error codes and how to do basic troublshooting. You would have also had a sheet on drip tees. They have been available for 4 years but more available as of 3 years ago. AND they are not the only one who makes them...verticle and horizantal. Like I said after your 300th, come talk to me. Good day...Master:laughing:
In the words of Andrew Dice Clay: "If you don't know the right answer, don't say anything at all".