The issue with using NG, at household pressures (1/3 PSI), is the torch is starved for fuel. The torch will still work, but can not go beyond what fuel is available. Ran a Scorpion at 1/3 PSI and it worked well but can only do so much.
Then added a booster and now at 5 PSI it works as it should. If purchasing a booster, buy one that has enough capacity to fuel the number of needed torches.
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