It is recommended not to let the device boil dry. However, you cannot see how much water is still in the kettle, so it's a bit of a guess. By default, when you turn on the device, the timer is set to 2 hours and 40 minutes. So I kept that time for the first time. When the device was almost done, E1 appeared on the display. That means the temperature got too high and the kettle was turned off. And indeed, it had boiled dry. Now I set it 10 minutes shorter. Then there is still a small amount of water left. That seems fine to me.
Furthermore, I also checked the quality of the distilled water by measuring the conductivity. The tap water here has a conductivity of about 250 micro-Siemens per cm (uS/cm). After the first distillation, it was around 40 uS/cm, which is lower than tap water but still quite high for distilled water. After distilling a full jug of water about five times, it improved after each run. Now I get values between 2.0 and 2.5 uS/cm, which is quite good for a distiller. Apparently, the cooling coil where the steam condenses into water needed to be flushed. But now the device works perfectly. When you use the water to make tea, the tea tastes much better, even if it has been sitting for a while. Furthermore, the distilled water is also very handy to use as the final rinse water for glass because it dries without spots.
In short, the device does what it promises. I would definitely recommend it.
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It is recommended not to let the device boil dry. However, you cannot see how much water is still in the kettle, so it's a bit of a guess. By default, when you turn on the device, the timer is set to 2 hours and 40 minutes. So I kept that time for the first time. When the device was almost done, E1 appeared on the display. That means the temperature got too high and the kettle was turned off. And indeed, it had boiled dry. Now I set it 10 minutes shorter. Then there is still a small amount of water left. That seems fine to me.
Furthermore, I also checked the quality of the distilled water by measuring the conductivity. The tap water here has a conductivity of about 250 micro-Siemens per cm (uS/cm). After the first distillation, it was around 40 uS/cm, which is lower than tap water but still quite high for distilled water. After distilling a full jug of water about five times, it improved after each run. Now I get values between 2.0 and 2.5 uS/cm, which is quite good for a distiller. Apparently, the cooling coil where the steam condenses into water needed to be flushed. But now the device works perfectly. When you use the water to make tea, the tea tastes much better, even if it has been sitting for a while. Furthermore, the distilled water is also very handy to use as the final rinse water for glass because it dries without spots.
In short, the device does what it promises. I would definitely recommend it.