Should I be worried ? My kalk stirrer motor compartment gets very hot and if you open the lid to it it’ll smell like a burning metal. Not sure if it’s normal. It’s been like that since I got it and I’ve been running it for a month
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Doesn't sound normal, and if it's hot enough to have a burning smell, I'd worry about a fire risk. I've never noticed my Avast getting hot.
From the website: The Kalk Stirrer uses a 20 watt motor that has a lifetime of about 1500 hours. Please don’t run unit continuously.
So running continuously, the motor is only good for 62 days. A review on BRS said run it no more than 15 minutes out of every two hours. It's been discontinued, so I would be shopping for an alternative if you heavily rely on Kalk.

