Just read the most disgusting thing about these. If you gross out easily don't read this, just don't use a hotel tea kettle ever again.
I was looking at Tours with Sarah's website last night and noted she included a coil immersion water heater in her packing list. So started googling info on them and alternatives and stumbled upon articles about people using hotel tea kettle to boil their underwear. Yep, totally disgusting even if pretty rare. Here's a piece from readers digest. https://www.rd.com/advice/travel/hotel-room-kettle/
We'll be bringing our own water heater. A dual voltage one like she recommends is $10 on Amazon or if you have the luggage space you can spring for a collapsible kettle for $20. The price for piece of mind and a cup of coffee in my pjs.