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Help with gas line size with reducing diameter pipes
I have a condo that has a gas hot water heater (part of a hydronic heating system) as the sole gas appliance in it. The water heater is a 50 gallon 65,000 BTU model that I'd like to replace. The gas line from the meter is 1" steel pipe for about 100' along the ceiling of the parking garage and then gets reduced at an elbow to 1/2" and rises straight up for about 30' to my condo unit where it feeds the water heater. There are no other branches on it. I'm trying to understand what my BTU capacity is given that the diameter reduces along the way or is it just calculated as if it was all 1/2"?