Finally I got some time to make the very changes requires to fix the warning is Home Assistant.
I hope it works out as I originally did not assign a state_class because the 5 sensors implied are not really measurements.
Warnings for these sensors should now go away:
- energy-used
- energy-exp-used
- water-used
- water-exp-used
- amount-remaining
Fixes #69
Full Changelog: v1.2.7...v1.2.8