Card insertion prepaid heat meter features:

1. The flowmeter has no mechanical gears or magnetic sensors, and is wear-resistant, corrosion-resistant, and attack resistant.

2. Automatic valve closing alarm in case of low voltage and damage from attack.

3. When the temperature sensor is open or short circuited, it will automatically close the valve and give an alarm.

4. Alarm when the remaining heat is low.

5. Dedicated encryption algorithm with good confidentiality.

6. One card per household, and can be paired with a one card system.