<https://www.inspectorsjournal.com/topic/16195-water-heater-vent-near-wall-fan-assisted-draft/#comment-135719>
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"That's a very interesting water heater. 29 gallon/90 gallon FHR with 61 GPH @ 90 deg rise. &lt;18\" diameter. That's some serious performance in a tiny package. And, it's rated potable and space heating.     Wow. \n"
<https://www.inspectorsjournal.com/topic/16195-water-heater-vent-near-wall-fan-assisted-draft/>