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Gas line to outbuilding - sizing questions
I posted on another website and the recommendation was for a 1" line, but when I called the local HVAC place (without sizing anything) the guy I talked with said to go with 1-1/4" pipe. This is my situation:
Maximum 150' run (after everything is installed, probably 130'), 1" SDR-11.
7" WC at meter
1" meter outlet
Meter rated for 400K BTU
Currently using 130K BTU total - water heater & furnace
I want to provide a gas line for a boiler - Viessmann B1HA 26 in an outbuilding for radiant heating. Boiler is rated up to 94K BTU.
When I look at charts for SDR-11 sizing, 1" appears to be sufficient... but 1 1/4" provides a significant increase of capacity so I'm leaning towards installing the larger pipe. However...
The meter has just a 1" outlet - to use a 1-1/4" pipe, will I have to increase the meter size? Would I be better off requesting a pressure increase and adding regulators at the house and outbuilding?
I'll be installing the gas line - pulling a mechanical permit - and will have an HVAC company connect the line once approved.