Share 'Domestic HWH diverter missing, or just different?'

Hi everyone, I haven't been in the game too long (two years), but I have been in a few hundred houses. I have never seen a DHW exhaust like this in any house. There is no draft diverter at the top of the water heater, and the exhaust is continuous until it enters the chimney. It is commonly vented with the 80% efficient furnace. I asked the owner about it, and she said she would have it checked…