Let's say it like that. If something works fine, then I normally don't replace it.
I will make another test, putting maybe 1 liter water in a smaller magnetic pot and look how long it takes before it cooks, and then the same procedure with the big not magnetic pot. Let's see.
I don't mind spending a couple of thousand THBs on new pots. But only if the old pots don't work as expected.
I.e. I definitely need one or two new small pans because the existing pans (I think it's aluminium) don't work at all on the new hobs.