For decades, I've had an old water temperature regulator that's been an important part of my darkroom plumbing. But gradually, it stopped working. This is the kind of regulator that blends hot and cold water to automatically maintain a constant temperature within about 1/2 F. Deg.
BHPhotovideo had an Array replacement regulator that would have been ideal, optimized for 1/2 to 2.5 gallon per minute flow. But because of the cost, I resisted purchase. Finally, I decided to bite the bullet and place an order.
Of course, guess what? IT'S BEEN DISCONTINUED!!!!
https://www.bhphotovideo.com/c/produ..._1B_Water.html
They still sell something similar that's optimized for a 1 to 7 gallon per minute flow, but for a substantially higher price. (Aarrgh!)
https://www.bhphotovideo.com/c/produ...g_1_Water.html
So, I thought I would ask: what other options exist? Note that I need something that automatically maintains the same temperature, versus a mixing valve.
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