> If you can open it, try to set the thermostat a bit further than the outside
> screw end run (it's a guess or trial-and-error adjust...). Or get ride of it
> and use one of your own inside the glass tube controlled by external
> electronics.
>
> If ferric chloride, 90ºF is good enough. Not as fast as 120ºF, but WAY
> FASTER than cold water temperature.
> Don't know about CuCl temperature differences.
Yes normally you can set the heaters higher by removing the knob or stop.
When I used Ferric Chloride found that it worked best heated. I use CuCl now and do not heat it.
Ben