A Lovelace card for displaying water tank temperature at different levels (top, middle, bottom).
To use this card, specify three temperature sensor entities: top_entity, middle_entity, and bottom_entity.
type: custom:aw-tech-water-tank-card
top_entity: sensor.water_tank_top_temperature
middle_entity: sensor.water_tank_middle_temperature
bottom_entity: sensor.water_tank_bottom_temperature