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Feb 2013 1) Rheem/EcoSense tankless product manual does not have specifications for length. Error 11 will let you know if venting is improper. Often, tankless are installed outside because unobstructed venting is key for combustion of the amount of gas coming out of 3/4" gas line. http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
2) Copy following link for Bradford White venting: Exactly same as Rheem, but more installation detail. No maximum lengths given. For lengths greater than 5 feet, a condensate trap must be installed. Acidic water from hydrocarbon combustion will damage metal, and destroy heat exchanger inside tankless if water drips back into unit. http://hometips.me/Tls/Venting-Bradford-White-tankless-gas.pdf
Before calling service technician, copy following link for ecosense tankless troubleshooting resources. C7 is communication failure with remote, and C12 is flame failure. Multiple error codes could mean bad circuit board, loose wire, low gas pressure, or simple communication problem with remote control. http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
The easiest way is to add up total of all gas appliances in house, using information from each appliance label. Measure diameter of pipe at meter. Call gas company and ask them if you need larger pipe and/or meter coming into house.
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