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just had a Navien NPE-240-NG installed and intake/exhaust are from outside. It can exhaust through chimney but I did not have access in basement and already had exhaust from previous tank blower. It also has condensation piped through PVC to condensation pump used by heater so those 3 would be helpful.
It does not get hot at all, certainly allowed distance behind, around are in inches as opposed to the hot water tank and the whole thing is enclosed in plastic. Heat loss is inefficient and that is their claim to fame.
I do notice that it does take a little longer to get hot water available even though this supposedly has about a 2 gallon reservoir.
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