If you use just one propane tank, you need a regulator designed for one tank. This high quality Italian-made Cavagna two-stage regulator is exactly what you need for safe and reliable gas supply on your one-tank system. The first stage reduced cylinder outlet pressure to 10 psi. The second stage maintains a stable working pressure of 11 water column inches.
This regulator is configured for mounting in a vertical orientation with vents pointing down.