On: Micro heaters cut 87% off my electric heat bill

[dredmorbius]

If the bottles are dedicated to this use, it's fine.

The soft-walled ones may discolour slightly.

[jtheory → dredmorbius]

It probably depends on the water bottle.

I put boiling water into a fairly thin-walled rubber one, and it sprang a leak a few minutes later, so I'm more careful now.

[dredmorbius → jtheory]

There's a reason I specified Nalgene.