Subcategory - 4. Immersion Heaters

Why are many contractors still installing immersion switches inside the hotpress in new installations. Would you agree that this rather loose regulaion (in my opion) is being missused.

Have many electricians come across the practice of bonding the hotpress from the immersion switch and not using 10sq earth when the plumbing installation is larglely completed in plactic rather than copper, ( is this a step backward in earting )