FAQ
How does the RTL control for radiant heating systems work?
The control of the heating temperature via the RTL principle (=return temperature limiter) is an established heating control technology. It is particularly suitable if the new radiant heating is to be integrated into an existing heating system with higher flow temperatures. The RTL valve permanently measures the heating water temperature in the heating circuit. If this is too high for a radiant heating system (the limit is about 45°C), the valve interrupts the flow through the heating circuit and no further hot water flows into the heating circuit. Thus, the water in the heating circuit then cools down again. If the temperature falls below the maximum temperature of the radiant heating, the RTL valve opens again. A detailed technical explanation of how it works can be found directly on the product pages for our RTL boxes.