Evening, hope all is well as usual
I was not sure if I missed it, was it a glass Jager that blew. I don’t know if you can return the one you bought, but if you can I would return it and switch to a Ranco controller and titanium heater. It may be a bit more but not too much. It will save money long term if compared to replacing a heater every so often. I installed same set up 11 years ago in my tank. Never touched it since, other than wipe the titanium clean.
Those glass ones scare me. Too many chances for glass to break.
And I am already scared enough as it is. My cat scares me, shouldn’t it be opposite?