Posted 6th October, 2025 at 11:31 by Matthew Varlow
A remote temperature sensor, when used with a controller like the Eberspacher EasyStart Pro, does provide a cabin temperature reading. However, it does not directly regulate the cabin temperature by modulating the output of the Hydronic heater itself.
The Eberspacher D5WSC Upgrade to the Hydronic S3 D5E is a suitable choice for your Water Heating requirements.
How an Eberspacher Hydronic Heater systems works:
- Heater's Role: The Hydronic heater's primary and only job is to heat the coolant in the system to a pre-set temperature (e.g., approximately 80°C). It will cycle on and off as needed to maintain this coolant temperature. It has no awareness of the cabin's air temperature.
- Sensor's Role: The remote room sensor tells the main controller (e.g., EasyStart Pro) the current air temperature in the cabin.
- Cabin Temperature Control: The actual regulation of heat into the cabin is performed by separate heat exchangers, such as fan matrix units or radiators. You control the cabin temperature by adjusting the fan speed on these units. A higher fan speed pushes more air over the hot radiator, releasing more heat into the cabin.
Therefore, while a sensor is part of the overall system and provides a temperature reading on your controller, it does not directly control the heater to maintain a set cabin temperature. The Hydronic heater heats the water, and you control the fans on your heat exchangers to regulate the room temperature.
I hope this helps.
