Hi,our new San Antonio has three different water heater switches,one is the rocker switch in the water heater compartment,the other two are in the central comand center.One is a big switch like you would find in a house,which lites up when turned on,it also has a rocker type on the monitor panel that just says heater,the owner book doesn't give a clue about that one,anyone know anything about that one. Thx.