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Old 11-09-16, 11:23 PM   #8
oil pan 4
Land owner
Join Date: Nov 2012
Location: NM
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Oops I never did give make and model number.
It's a "Marey" model GA16NGETL
This is a smaller unit, at 4.3gpm water heating capacity this one is not really intended to be a whole home unit.
It can use the existing gas system and with 3 inch intake and exhaust requirement it will work fine with the existing 3 inch exhaust and 4 inch abandoned wall heater exhaust vent in my house.

Whole home units ate typically 7.5gpm. And they need large 5 inch intake and exhaust ducts. Existing exhaust vents are likely 3 or 4 inch Then the existing 1/2 inch 0.4psi gas line systems in most homes may not be able to provide enough gas.
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