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[Stephen Swaffer]

https://www.grainger.com/product/41D381?gclid=Cj0KCQjwtsv7BRCmARIsANu-CQeYQhFXZD8ZItbL-eoBPJ6ls8uwYr1xJ6LqkqGdhKCHz0TFZE-jk7UaAss9EALw_wcB&cm_mmc=PPC:+Google+PLA&ef_id=Cj0KCQjwtsv7BRCmARIsANu-CQeYQhFXZD8ZItbL-eoBPJ6ls8uwYr1xJ6LqkqGdhKCHz0TFZE-jk7UaAss9EALw_wcB:G:s&s_kwcid=AL!2966!3!281698275258!!!g!472455603095!&gucid=N:N:PS:Paid:GGL:CSM-2295:EUGDJC:20500731

The search term I used was "50 va transformer"-then you can pick voltage.  It's a pretty common application.

[David Allred]

https://www.grainger.com/product/41D381?gclid=Cj0KCQjwtsv7BRCmARIsANu-CQeYQhFXZD8ZItbL-eoBPJ6ls8uwYr1xJ6LqkqGdhKCHz0TFZE-jk7UaAss9EALw_wcB&cm_mmc=PPC:+Google+PLA&ef_id=Cj0KCQjwtsv7BRCmARIsANu-CQeYQhFXZD8ZItbL-eoBPJ6ls8uwYr1xJ6LqkqGdhKCHz0TFZE-jk7UaAss9EALw_wcB:G:s&s_kwcid=AL!2966!3!281698275258!!!g!472455603095!&gucid=N:N:PS:Paid:GGL:CSM-2295:EUGDJC:20500731

The search term I used was "50 va transformer"-then you can pick voltage.  It's a pretty common application.

40va means a limit of 40 watts, right?  Barely enough for a small light bulb.  Transtormers of sufficient size are, well, yikes. 

[Stephen Swaffer]

Correct-but the OP was only running a small water treatment control-so 40 watts is reasonable.  Very quickly it would make more sense to purchase a 240 volt "appliance".

[Daniel Levi]

40va means a limit of 40 watts, right?  Barely enough for a small light bulb.  Transtormers of sufficient size are, well, yikes.

Yes, the one for our "bath spa" (a device that sits on the side of the bath to create a "spa" action) is about the size of a brick and is only 12V 4A.

[Steve-White]

It's against code, only bond neutral/ground at service entrance.  May also be dangerous, and introduces ground loops. 

Oh, and the worms.  Think of the poor toasty worms.

Why N. Tesla created step down transformers.

[ProSoundWeb Community]