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Drew and Mert have made excellent points, but I am going to suggest that you look closer at your existing wiring first before making a decision. It is obvious from your post that you wish to use this existing wiring, but you do not state when this existing wiring was installed, what purpose it served initially, it's current condition, wire type, etc. These are all important points to consider when making this decision.
Since you are installing a new tub, you are required by the electric code and the tub manufacturer (Sundance) to meet the code in effect at the time of installation. Failure to do so can result in an illegal installation and completely void your manufacturers warranty on your new tub. The 2002 and 2005 code changes brought a LOT of changes to the requirements for hot tub installations. If your existing wiring predates the 2002 code changes, the odds are high that your new installation will not be code compliant, with all the attendant liabilities resting on you.
If you find that your existing wiring meets current code for your area, then I agree with the other posters suggesting trying the tub at 50 amps. On the other hand, if you find the existing wiring is not code compliant and must be re-done, I'd suggest going right to 60 amps. Use wire that is rated at least 90 C (THHN or equivalent) and consider upsizing the wire run between the house and the outside disconnect.
: I'm, gettin a sundance Bahia, and they say I could use either or 50 or
: 60 amp, but the heater wont work with the 50 amp when the jets are on
: high has anybody experience any problems with this, with the water
: gettin cold, or heater runnin to much after or the gfci trippin or
: anything, if I use a 50 amp, I have a 50 amp service there already
: with the right wiring that why I just want to go with the 50
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