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Are the heating elements in Cotes dehumidifiers modulated from 0–100%?

Cotes dehumidifiers do not use continuous 0–100% heater modulation. The heater’s primary role is to maintain the correct regeneration temperature, while overall energy efficiency is achieved through smarter system control.  

Instead, of using a continuous 0–100% modulation of the regeneration heater, Cotes adsorption dehumidifiers ensure stable regeneration temperature, which is essential for ensuring consistent drying performance. Energy optimisation is handled through other system parameters. 

Why isn’t the heater continuously modulated? 

In adsorption dehumidifiers, the heater defines the regeneration temperature, which is critical for drying the rotor. 

  • If heater power is reduced → regeneration temperature drops  
  • If temperature is too low:  
  • the rotor is not fully regenerated;  
  • drying capacity decreases;  
  • the unit may run longer or fail to reach the desired humidity level.  

For this reason, Cotes systems prioritise stable regeneration temperature over continuous power modulation. 

How are the heaters controlled? 

PLC B systems (e.g. C65E / C105E)  PLC C systems
  • Heater control is stage-based (ON/OFF steps)  
  • No continuous modulation from 0–100%  
  • Designed to maintain stable regeneration conditions  
  • Airflow is typically fixed during commissioning  
  • Still not based on continuous heater modulation  
  • Adds more advanced optimisation:  
  • automatic airflow control (EC fans)  
  • rotor speed adjustment  
  • improved control logic 

How is energy consumption optimised? 

Cotes systems optimise energy use at system level, not by continuously reducing heater power. Energy savings are achieved through: 

  • Airflow control (adjusting air volumes to actual demand);

     

  • Control strategy (dew point / RH-based operation);  

  • Rotor speed control (on PLC C systems);  

  • Heat recovery (where applicable). 

This approach ensures efficient operation without compromising drying performance. 

What are the benefits of this approach? 

  • Stable and predictable drying performance  
  • Avoids under-regeneration of the rotor  
  • Prevents unnecessary runtime and inefficiency  
  • Provides better overall energy efficiency at system level