Flue close

What should be said about this water heater flue and HE furnace being this close together? Thanks

What do you think?


Bad idea of course.

BTW, I’ve never seen a concentric vent installed vertically in my area but it is allowed.



I would recommend the WH vent be elevated above the intake for the HE.

That metal vent appears to be oversized for just a water heater. Was there a combination WH and a 80% furnace before the addition of the 90%. I would be concerned if that size metal vent served a single WH. The flue gas might condense before being discharged. Just my thoughts

Thanks! I did all that.