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The gas pressure the regulator allows to the appliances, water heater, furnace, and stove/oven is 11" of water column, which is a lot less than 30 psi, maybe closer to 1/2 psi. So, If both tanks are connected and valves are open, the auto switchover valve on the main regulator will switch to the full tank soon enough to maintain gas flow to keep things working. We've been over six years full time and never keep one tank closed and never have to get up in the middle of a very cold night to go outside to switch tanks.
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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