I know enough to electrocute myself, will that help?
You'd probably have to be a licensed electrician to know the lingo. That said I'm going to guess you're looking for a timer or digital control that has a fireman's switch feature. This allows you to set a time period that the pump runs after heater turn off. I never heard of it before I bought an Intermatic PE153 digital control. But apparently you can get them for mechanical timers too.
I'd look for someone that has experience with installing digital controls and timers for pools and spas. They should also know enough to speak in layman's terms and not overwhelm you with the lingo.
But I'm baffled by the heater that doesn't have an electrical connection. The manual for the one you specify seems to indicate that it needs electricity to operate the gas valve, ignite the gas, and operate the thermostat. How do you turn it off before the pump shuts down now?
Otherwise the items you listed can be powered using either 115 or 230 volt. You'll need to know which is being used before buying or installing a timer as some are one or the other, and many are either but have a switch that must be set to the right voltage for each timed circuit. From your description I'd guess they're all wired to 115v. But I'm assuming that the pony box is breaking the 230v from the house into two 115v circuits.
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