For me, it would probably have to be my Bialetti moka pot and Dualit toaster. I make a pot of coffee and toast almost every morning. I also hope to replace my old pans with a cast iron one soon, and I look forward to using that a lot.
I didn’t realize this was a thing many American homes lack or are perceived by other countries to lack? I’m in the US and have one, my teenage stepson loves it for getting water up to temp faster for his cooking. I don’t use it that often but I think it’s worth having anyway.