I will be building an IG pool and IG spa (7ft spa). I will be heating the spa with a 400K BTU propane heater. I would like to heat the pool a couple of time per year for special events. Local code limits the size of a propane tank to 125 Gallons; anything bigger will require a permit from the fire dept. While I can certainly get the permits required for a larger tank my question is will 125 gallons of propane be enough to run the spa without needing to fill it too often? I live in northern CA (Sacramento area).