I need to supply gas to a new hybrid water heater. According to the manufacturer, it requires a 3/4" input line.
The gas line comes directly from the gas meter via a 1" line to the water heater closet. There, it goes into a Tee. The Tee is a 1" (from the meter), 3/4" that feeds the rest of the house (furnace and stove), and 1/2" that feeds the existing water heater. Some say I have to remove the Tee and go with one that gives me a 3/4" line to the rest of the house and a 3/4" line to the water heater. Others say I can just put a bushing on the 1/2" line, taking it up to 3/4" and I'll be fine.
I've tried talking to the manufacturer and they do not want to get involved in "construction matters" (liability worries).
This is in California (1/4 pound pressure gas).
Any thoughts? Go with a new tee or bush up the old one? Or any other idea?