It looks to me like those time constants are mostly about internal heating from current flow.
How the thermistor is potted will make a difference, but I'm pretty sure a thermowell would so… (View Post)
Just to be clear -- this is a male NPT 'half nipple' protruding from the tank? Is there enough room to cut and re-thread it? You'd need space for a pipe wrench or some kind of good grip below the t… (View Post)