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Hi, I hope to install a a tankless water heater for one bathroom in my house. I know it can not be vented through the chmney flue that the furnace uses (right?). But there is an 3′x4′ opening (I think originally for coal or oil) from the “frontyard” of my brownstone to the basement. I vent my clother dryer through there. Could I also vent the water heater through there if it is 3′ from the house? I assume I need the vent cover needs to be a certain distance high to rise above potential snow accumulation.

One more thing… if the tankless thing doesn’t work, can traditional water heaters be put in parallel? I have a very large tub to fill.

Thanks