Here’s the result…
“The water heater had equipment installed for burning propane, but the home was supplied with natural gas, not propane.
This condition has resulted in excessive soot accumulation around the draft diverter and near the burn chamber which indicates a combustion problem. Some water heaters are manufactured in a manner which will allow parts to be changed to correct the problem. Other water heaters require tank replacement. Given the water heater model number, a qualified HVAC or plumbing contractor should be able to determine which option is available.
Although as part of my service I don’t make contractor recommendations, Day & Night provides service in your area. (303) 936-2696
The model number was PR6 50 PBRT980 D.”
The water heater was not backdrafting at the time of the inspection although the basement was pressurized due to failure to install cold air returns. Flame color was good.