I am about to install a propane above ground pool heater. The propane company said I need two 472 lb propane tanks but I am thinking I only need one. Do I need two tanks or can I manage with just one.He sad it had something to do with the tank free freezing up. Does this mean anything to you?

As the temperature drops the gas will not flow enough BTU's to keep the pool heater fired up. Call another propane dealer in your area for another estimate on what you will need.