Silicone Heater

Phaedrux

A little pricey

You might be able to find the same part at a different reseller. Digikey encourages selling in bulk. Check for any regional electronics outfits that may carry them or something similar.

If you're in Canada, check https://www.be-electronics.com/searchresults.asp?Search=thermal+cut+off&Submit=

gtj0

These are the ones I use...
99C : https://smile.amazon.com/gp/product/B07K358CKK/
or
128C : https://smile.amazon.com/gp/product/B0195UX2KA/

sinned6915

Deler-

I have Ali Rubber heater, 800W, 350x350. I know, crazy stupid big, I ordered from the printer BOM before I understand what I do now. Its been great. I honestly don't go over 100C. I know a bunch of people who swear by them and their service.

I dont understand how the Keenvo are better other than their marketing- its a resistance heater with nichrome wires.

suggestions- get it made with a couple of holes for post install thermistor or thermal fuse additions later.

you CAN fix a nicked heater wire by carefully excavating and wire wrapping the ends and covering in RTV.

and dont forget supplemental ground to the bed.

Deler

thanks @sinned6915 I will definitely check Ali Rubber heater