Thanks Duvel! I looked into these briefly. They take 3mins, which is slow.
My current solution is a fine-spouted Oxo kettle that goes only down to 104F but has a temp gauge, so I turn it on and just watch the temp like a hawk and hope I don't miss if it goes wrong. It's quite annoying to use because you have to press the main button to turn it on, then again to initiate the warming, and then watch it like a hawk. After warming and using, you have to replace the kettle, then press the button again, … It's just a crazy amount of faffing for what should be very simple! I have to do this twice a day, so the little annoyances add up.
I keep figuring I'm missing some easy solution… Instant-read thermometer in a larger clear kettle? Clear kettle that at least has a temp readout and fewer button presses?
I'm very interested in immersion circulators since I'd love to try sous vide-ing steak someday but don't want to invest in a huge sous vide bath for something I'd do infrequently. The water I'm heating to 98.6F will go into small bottles with 5/8" spouts, so it might be a bit impractical to use a large immersion circulator for this purpose every day? But the steak would be amazing....