Plumbing – Upsizing Gas Line From Tee

Your 2# regulator is likely dropping the pressure down to about 1/4 psi which is what most appliances need. By putting the tee after the regulator and running a 80ft line isn't going to be sufficient. Longer runs generally need larger piping. Your 1/2in line wont be able to keep up. You probably should have ran the 2psi line (i.e. a tee before the regulator) and installed a 2nd regulator up there.

Here in the United States, most houses are fed 1/4psi after the meter and if there is problems with piping or a need for large appliances, generally pressure can be increased to 2PSI. Since you have 1/2" gas piping, that might explain why you have 2 PSI of gas. On my house, the line coming in is 1-1/4".

• "shouldn't I have seen a more substantial improvement in pressure and/or flow by upgrading to a NEW, much larger 1" dia. line?"

Not if the downstream galv. pipe at the entry point to your home is in the same condition as the pipe you replaced.

• "does anyone think that the 3/4" meter at the street may be causing a restriction at all?"

Yes, but it is insignificant compared to the restricted galv. pipe downstream that you did not replace.

• "Would replacing it with a 1" in/out version help any?"

Yes, after you change out the restricted downstream pipe.

• "2-stage whole house filter... has less than ~1psi pressure drop across the system..."

All filters restrict flow. BTW, install a bypass line around your filter unit so it will be easy to perform maintenance or remove it from service (when you get tired of maintaining it).

• "hot water still takes about the same time..."

When you increase flow by removing the restriction (old galv. entry pipe) the hot water will arrive sooner.