You have a regulator on your house, probably two of them. The first will be down on the tank and the second at the house. At least that's how my house is setup. The tank regulator provides 10 psi and the house regulator is only 9-13 inches (of water). You'll need to find where the secondary regulator is located and tap off ahead of it. I was planning on running my kettle on house propane, but determined it wasn't worth the effort. The zoning here does not allow 10 psi propane inside.
Fortunately, the propane dealer will fill my 20# tanks when he fills the main tank. Used to fill the RV as well.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk