My system utilizes a 500 gallon propane tank for pressurized storage. The tank is located in my garage up against a shared/heated wall of the house. The garage itself has two insulated walls and two uninsulated walls. From what I can tell the temperature in the garage stays about 20 degrees above the current outside temperature. What I would like to do is build a box around the tank and then fill it in with blown in insulation. My plan is to allow 12 inches of space on all sides except for the shared wall. Before I got started on this I figured I should run it by the Hearth Brain Trust. Do you guys think that this is enough insulation to prevent high standby losses?