I did an inspection back in November on a 2007 build. The water heater was replaced in 2014 and was properly permitted by the AHJ. The buyer/buyers agent let the utilities lapse and be shut off between then and last week. The gas company came out to re-install the gas meter and in the process had to check the gas appliances apparently, in doing so he red-tagged the water heater and disconnected its gas supply with the note ‘no-combustion air’. The water heater is installed in a garage that is approximately 24x30, 720sq ft and by my knowledge installed correctly and meeting requirements.
Nothing with the design of the home has changed since 2007 when the home was built or since 2014 when the water heater was replaced and permitted by the AHJ. The gas company says there needs to be a vent cut in the wall to the exterior near the water heater for combustion air. The agent and buyer are trying to get me to pay the estimated $600 for the work to be completed.
I suppose my question is, what are the requirements for combustion air for a water heater in a garage and why would November of 2019 be any different than 2007 when the home was built or March of 2014 when the water heater was replaced then inspected and permitted by the city?