Install Lovelace card mod from HACS.
• Create in your www folder a folder named 'heating_curve'.
• Copy 'heating_curve_line.png' and 'heating_curve-grid.png' to the new created folder.
• Copy the YAML from 'heating_curve_card.yaml' and past it in a new manual card.
• Edit the entities in the yaml to your entities (at 2 places!).
• min_out and min_water are the temperature entities at the left of the grid (-10/45°C).
• max_out and max_water are the temperature entities at the right of the grid (20/30°C).
• Save the card and you’re done.
