'Volt-Free' smart control systems are suitable for use with most of our product ranges. However, the WarmCair heat only range must use the OpenTherm programming language - check before purchasing that your chosen system is OpenTherm capable to ensure it operates the heater correctly.
Installation of any non-OpenTherm control with a WarmCair heat only appliance will invalidate the guarantee.
If your system uses a ModAirFlow thermista-stat, then you can use any Volt-Free controls, however you will lose the increased fan modulation for which the ModAirFlow contol system is designed. This will reduce the overall efficiency of the appliance, causing the fan to run harder and with more on/off cycles.
If you have one of our older heaters with the E-T/Eco thermista-stat, only E-T/Eco thermista-stat will be suitable for replacement. Any other thermostatic control will not allow the appliance to operate correctly.
Using any 240V thermostatic controls will damage the circuit boards of the heater and must not be used.
Johnson & Starley Guide to Third Party Controllers