Sunterra 2000 gph pump quit working, after cycling on and off

firstly, don't be so certain that doubling your pumping capacity isn't damaging other parts of your pool system. Excessive flow reduces filter efficiency, can cause hyper chlorination, and cause faster degradation of the plumbing and pool surfaces.

a noisy pump typically indicates poor lubrication on bearings and bushings in the pump assembly, or misalignment of those parts. Things like this happen.

Either replace the pump (and i recommend going back to the original design specs) or rebuild it, using new bushings / bearings, high quality lubrication, and be certain that the drive shaft is perfectly straight, and that the bushings allow it to spin freely.

You can buy that at most full service parts stores.

I have the same pump and the filter can't be found. I made my on from stuff at the hardware stores.

There is a fairly easy way to vary the flow on nearly any pump. You can use a valve after the pump to restrict the flow up to 20% or so without putting to much strain on the pump. As to a specific pump I would need to know the G.P.H. range you are looking for and I would be happy to help find you the right pump for your needs.

The only bearings I can locate on the unit are built into the motor and its housing. Considering accessing them would damage the water tight seal I would not recommend replacement.

you could get one or make one from a cardbord box and coat it with silicon gasket sealer

Their are many varibales that go into this and your gas company should be able to help you with this. They will quite often send someone out to check for you as they get to sell you more gas if you run the heater. But you need tank size, pipe size, run of pipe, local weather to name some of the things along with all other appliences in the house. So you do need to have it sized by a pro on the job site.

If you find a replacement 2000 Impeller for your 2008 sunterra pump, let me know! I called the company who promptly told me they don't sell component parts for any of their pumps larger than 1250. They very matter-of-factly told me to go buy a new pump.
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Most likeluy it overheated wile running outside of the water. It neds the water for cooling.
You might need to buy a new one

the heater bypass is quite simple, if you look at the firewall you will see two medium sized coolant lines, remove them from the firewall and link them together using a proper sized tube, you can purchase a kit at a parts store quite cheaply