The EPH CP5i Smart Thermostat with OpenTherm is an advanced, user-friendly heating control solution designed for combi boilers and single-zone heating systems. Supplied as a complete, pre-paired kit—including a sleek wireless Touch Thermostat, an RF receiver, and a Wi-Fi gateway—the CP5i enables effortless installation for installers and straightforward remote control for homeowners via the EMBER Smart Heating App.

Featuring native OpenTherm® modulation technology, the CP5i communicates continuously with compatible boilers to dynamically adjust flow temperatures. Rather than relying on traditional on/off cycling, this modulating performance maximizes boiler burn efficiency, reduces fuel consumption, and delivers superior indoor temperature stability. With flexible 7-day, 5/2-day, or 24-hour scheduling options alongside built-in Optimum Start and TPI functions, it offers modern comfort control for both retrofit and new-build installations.

Main product features:

• OpenTherm® Boiler Modulation: Continuously adjusts boiler flow temperatures based on room demand to optimize efficiency and reduce energy costs.
• Complete Pre-Paired Pack: Includes a wireless touch thermostat, receiver, and GW04 Wi-Fi/Ethernet gateway pre-configured out of the box for quick setup.
• Smartphone Control via EMBER App: Adjust heating schedules, room setpoints, and boost functions from anywhere using the EMBER Smart Heating app.
• Sleek Touchscreen Display: Backlit touch interface with intuitive controls, table stand or wall-mount flexibility, and integrated PIN lock safety.
• Smart Control Algorithms: Features Optimum Start (up to 3 hours pre-heat) and TPI (Time Proportional & Integral) control to prevent temperature overshoot.
• Flexible Multi-Zone Expansion: Connects up to 6 thermostats/receivers to a single system for expanded multi-zone control.

Technical Specifications:

Manufacturer: EPH Controls
Part Code: CP5i
Product Type: Wireless OpenTherm® Smart Thermostat Pack
Connectivity: RF Wireless (Thermostat to Receiver) & Dual-Band Wi-Fi / LAN (Gateway to EMBER App)
Boiler Protocol: OpenTherm® & Standard Volt-Free Switching
Programming Modes: 7-Day, 5/2-Day, 24-Hour (6 time/temp settings per day)
Temperature Range: 5°C to 35°C (Heating)
Power Supply (Thermostat): 4 x AAA Alkaline Batteries (Included)
Receiver Power Supply & Contact Rating: 230V AC supply / 3A SPDT volt-free output
Mounting Options: Wall-Mounted or Table-Mounted (Stand Included)
Primary Application: Combi Boiler Control, Single-Zone Heating Systems, & OpenTherm® Retrofits
Warranty: 5-Year Manufacturer Warranty