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

[OwenDella]

Maintaining your Harvia D23XE electric sauna heater involves knowing when to replace the sauna stones. The instruction manual recommends rearranging the stones at least annually, or more frequently if you use your sauna often. Here's how to tell if it's time for a replacement:

1. Stone Condition: Check for disintegration. If the stones are crumbling or breaking down, they need replacing.
2. Stone Size and Type: Ensure your stones are between 4-8 cm in diameter and are specifically designed for sauna heaters. Avoid light, porous ceramic stones or soft potstones, as these can damage the heater.
3. Airflow: Make sure the stones aren't blocking airflow. Overly packed or undersized stones can reduce heater efficiency.
4. Heating Performance: If your sauna heats slowly or doesn't reach the correct temperature, it might be due to worn-out stones.

Using incorrect or damaged stones can void your warranty and damage your Harvia D23XE. Regular stone maintenance is crucial for the heater's performance and your safety.