That is my point, a tank from a local store that is 48wide x 22deep x 18 high is 209$ and PVC enclosure is not available for pick up that is 48 wide x 24 deep x 16 high is 289$ plus 120$ shipping so 409$ compared to 209 plus 30$ for the plexi door. That is quite a savings, the weight makes heating easier as it holds heat for so long. It is harder to move but I rarely move mine. Each has advantages and disadvantages for me neither is clearly better.