I just looked at the exploded drawing for the Manatee. It looks like a very simple heater. The heater will simply come on whenever the pump is running and the thermostat says that the tub is not hot enough. So, for the heater, set it and forget it.
The adjustment you can make is by setting the low-speed pump timer. There should be a timer on the control box, somewhere. Generally, you set the timer to come on for a couple of hours, twice a day. During those times, the pump will come on low-speed and the heater will come on as needed.
Keep in mind that the tub will only heat when the pump is running so you will want to set the timer so that the tub has been running for at least an hour when you will be ready to use it.
Most controls will also allow you to put the pump on thermostat control, usually with a switch (timer/ t-stat). By running on t-stat control, the low-speed pump and heater will turn on whenever the temperature drops a couple of degrees.
Timer control is usually more efficient for two reasons:
1. The tub doesn't heat water when you don't need it (like while you are sleeping or at work).
2. The pump isn't cycling on and off all day and night. Cycling is not very efficient.
Tip: If you want to soak when the tub isn't hot, just turn the pump on for 10 minutes or so before you get in. That is a pretty big heater, and unless you have very poor insulation or a worn-out cover, the temp shouldn't drop too fast.
Another tip: The best way to save money on a tub is to maintain your pH. Check it EVERY WEEK! Incorrect pH will shorten the life of your heater and seals. One service call would have paid for a lot of electricity.
Please feel free to post follow-up questions.
Testimonial: "Thanks so much for the info. We will give these instructions a try and see what happens. We may be back in touch!! Appreciate the help. "
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