This is not an easy question to answer due to the different variables involved. Some variables include the size of the fire pit, gas pressure, length of run, and other BTU input requirements. Another commonly forgotten aspect is that other appliances connected to the gas line, along with the fire pit. We have recommendations for the fire pits in our catalog and the support section of our website, but we recommend working with your plumber are well to account for all factors to ensure proper gas delivery.