arunmit

Hi I just had a Hayward E COmmand 4 system installed at my vacation home. I guess I didnt think it through.. The issue is that we have some guests who pay for pool heat and spa and others who dont. The only way to ensure that guests who dont pay donot turn heat on is by turning the breaker OFF and locking the control box. For guests who do pay, we can leave the box open but then the problem is that too many people playing around with the panel which is sort of complicated. I have been told an "egg timer" should be installed outside- so paying guests just have to turn it on and the spa heater turn on. I am not sure how this works...Can someone please let me know if this is possible and how would this actually work? I would really appreciate your responses- I dont want to spend another couple hundred bucks and not have the right set up Thanks