Backstory: I purchased some 24v pumps that I use in homebrewing beer.  Lacking any good option for a 24v DC output, I grabbed a doorbell thermometer at the hardware store and rigged it up in a single-gang box (don’t try this at home, kids!).

For reasons likely involving moving boiling wort through one of these for 15 minutes before shutting off the heat (boiling wort is an effective sanitizer), I blew two transformers before looking into things.

The ultimate end of this is that I’ve decided to stop using the cheap pumps and am going to purchase a decent pump.

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