Hello all. I am wanting to price heat pumps and compare brands,however, I cannot determine my pool volume. Our build starts in March. Our pool will be a vinyl 18x34 rectangle, play bottom (wedged to center- no flat spot) 3.5’ - 5.5’ - 4’ . Steel walls are 42” and i e shallow end will have an appx 6” cove to achieve the 4’ . 10 ft Roman steps at each end. My understanding is the pool depths are wall height. Does anyone have a formula or similar pool?