I posted a request for plumber reconditions in the other forum but I wanted to get input here as well so I'm armed with a little knowledge before I talk to them. I am looking to add a heater and have questions on the gas service. The pad is already plumbed with a gas line from a previous heater that was removed before we moved in. I have a 1" line coming out of the meter and 3/4" coming up at the pad. It's obviously necked down at some point underground. The total run is about 60 feet.
I had the gas company install a new meter that is good over to 1M BTU so I'm good there. Ideally I'd like to go with a 400k BTU heater but I know my current setup wont support that. I had a pool builder out and he said that a 333k should be ok. He had no way to say for sure though. The gas company guy was also not very definitive on if it would work.
Is there anyway to test the flow to know for sure? Can a plumber do that? I don't want to have this heater put in just to find out I need to spend another 1-2k on a new gas line. I also don't want a situation where the thing works, but is under feed, and decrease it's life or efficiency. I've seen talk about increasing to a 2# system but I don't really know what that entails cost wise.
Advice/suggestions would be greatly appreciated.