How do I know when to replace the sauna stones in my Harvia D23XE electric sauna heater?

[Bentley]

Maintaining your Harvia D23XE electric sauna heater is key to a great sauna experience. The sauna stones play a crucial role, and knowing when to replace them is essential. According to the Harvia D23XE instruction manual, you should rearrange the stones at least once a year, or more frequently if you use your sauna often. Here's how to determine if it's time for a replacement:

1. Stone Condition: Over time, sauna stones can break down. Check for crumbling or disintegration. If you see this, it's time to replace the stones.
2. Stone Size and Type: Ensure you're using stones specifically designed for sauna heaters, typically 4–8 cm in diameter. Avoid lightweight, porous ceramic stones or soft potstones. They may not withstand the heat and could damage your heater.
3. Airflow: Proper airflow is vital. Check for any blockages caused by stones packed too tightly or stones that are too small. These blockages can reduce the heater's efficiency.
4. Heating Performance: If your sauna room heats up slowly or the stones don't reach the correct temperature, it might be time for new stones.

Using incorrect stones or stones that are damaged can void your warranty and cause issues with your Harvia D23XE heater. Regular maintenance, including replacing sauna stones when needed, helps ensure optimal performance and safety.