EPH CP4D – OpenTherm Programmable RF Thermostat

The EPH CP4D RF Programmable Dial Thermostat is a wireless OpenTherm programmable room thermostat with intuitive dial control, paired with an RF receiver for single-zone boiler control. It combines a large backlit display and handwheel temperature adjustment with Boiler Plus compliant load-compensating control, helping improve comfort and efficiency.

Why Buy the EPH CP4D RF Thermostat?

• Intuitive handwheel dial for quick, precise temperature changes with a clear digital display.
  
• OpenTherm modulation and TPI control to reduce boiler cycling and optimise efficiency.
  
• Fully programmable RF thermostat with multiple time and temperature periods each day.
  
• Boiler Plus compliant control strategy meeting current efficiency regulations.
  
• Frost protection, boost and holiday modes for all-season protection and convenience.
  
• Pre‑paired thermostat and receiver for straightforward wireless installation.
  

Suitable For

• Combi and system boilers needing an OpenTherm‑capable wireless programmable stat.
  
• Users who prefer dial-based temperature control with modern programmable features.
  
• Retrofit upgrades from basic on/off stats to Boiler Plus compliant RF controls.
  
• Homes aiming to improve efficiency and comfort with time/temperature zoning on a main circuit.
  

Technical Specifications

Specification	Details
Product Type	Wireless programmable dial room thermostat with RF receiver
Control Range	Approx. 5–35°C adjustable setpoint
Control Modes	Automatic, manual, off, holiday, boost with TPI and OpenTherm options.
Programming	Multiple daily time/temperature periods with 24‑hour, 5/2‑day or 7‑day modes.
Frost Protection	Adjustable frost setting active in off and holiday modes.
Thermostat Power	Battery powered with AA alkaline cells, low‑battery indication.
Receiver Power	Mains‑powered RF receiver for boiler switching.
Output Contacts	Volt‑free contacts suitable for most boilers and OpenTherm terminals.
Display	Large backlit LCD showing setpoint, room temperature and status.
Installation	Wall‑mounted thermostat and receiver, portable use possible with stand where supplied.
Typical Warranty	Extended multi‑year manufacturer warranty (check pack for exact duration).