Construction of my in ground gunite pool and spa completed recently. We fired up the 1000 gallon spa this last weekend and notice a 20degree/hour rise in the spa temp. So it took about 2 hours to rise from 62degrees to 100. This seems a little slow to me. Does anyone feel if this rate of rise is typical for a 1000gal spa? There was no wind and the outdoor temp was 68 and no cover. My heater is a Jandy LRZ 400k BTU propane with a Jandy ePump running at the time at 3000rpm.