Can we use more refined metals?

Tepidizers are ONE way to heat up water. There are also refineries, magma, and some geysers.

This isn't really as much of a bug as a gameplay suggestion...  I get what you're saying, but it hasn't come up for me as a problem (that I haven't found another way around).

for cleaning water you can also put an liquid container in chlorine, an bye bye germs...