I had just got this water heater due to the failure of my prior 80 gallon water heater, Bought it used, And happened to notice a green color on the copper heat exchange, Does that mean the pipe ruptured and I should take it back to the guy I purchased it from or just typical wear and tear?
Green can indicate a water leak .you would have to check for a leak to be sure
SOURCE: Looking for Outdoor Tankless propane water heaters
it will tell you right on the box if it for indoors or out doors either way they have to have a cover over them,,
SOURCE: I have a Bosch AquaStar AQ-125-BNG tankless water
there is a small dia copper pipe which has a thermal coupling on it the end of it sits in the flame of the pilot light,
if it fails which it does after about 25-15 months,it shuts down the gas burner
SOURCE: I have a Bosch AquaStar
Tankless should never be installed with plastic pipe, PVC or CPVC etc.
Before calling service technician, open following link for Bosch tankless troubleshooting resources, including Bosch contact information, typical manuals, error codes, tech support, parts, fuel-saver calculator, service bulletins, water heater forum, fixya links, disclaimers, and links for finding service technician.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
Read manual cover to cover, make sure tankless receives yearly maintenance as outline in manual.
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