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2006 Vanguard, confused on heater replacement (4kw vs 6kw, & thermistor threads)

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clh42:
Just thought I'd give a final update in case anyone else runs into the same issue(s).

All is well.  New 6 kw heater installed and working great.  Albeit now without a working spa light.

As I mentioned in a previous post, my local dealer confirmed that my spa likely did indeed come with a 6 kw heater originally, but when they replaced it under warranty they replaced with a 4 kw.  My local dealer says all they stock is 4 kw heaters as replacements.  They've never used 6 kw heaters as replacements.  (I didn't ask, and they didn't say why.)

Regarding the threads on the old thermistor not matching the new heater, that was indeed the case.  I ordered a new pair of thermistors and they fit in the new heater just fine.  So Watkins did indeed change the threads on that thermistor (and corresponding heaters) at some point.

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