I want to istall a Raypak 336 natural gas heater. I checked the sizing and it exactly what I need for my inground pool. My problem if I do have one is that I currently have natural gas running into my garage that I use to heat it in the winter. My pump room is a room just off the garage. The line is a 63 foot underground line that is 1 inch. it then goes to a 50 foot section in the garage itself that is also 1 inch. Do I have a large enough line to handle the 336? if not what options do I have, dig it up to a larger line or can I do a two stage? Any help would be appreciated.