I just called Hayward to confirm that if I were to purchase one of their In Ground 400K BTU Natural Gas Heaters, that I would be able to wire the electric to my existing 20 amp line that currently powers my pump and my salt water system. To my surprise though (maybe not to yours), I was told that their Natural Gas Heaters actually require their own sole dedicated 15 amp line (nothing else can go on it), because there is an initial power draw that would exceed what the 20 amp line was capable of if it was shared with items like the pump. He said the only want to protect the equipment was to give it it's own line.
So, my question is, is this true for all natural gas heaters? Or is this just the Hayward line?