The EPH TS21 Smart Heating and Hot Water Thermostat Pack (EMBERTS21) is a complete multi-zone digital control solution designed to provide flexible time and temperature management over space heating and hot water circuits. Supplied as a fully pre-paired kit—including a wireless Touch Thermostat, an advanced twin-channel RF receiver, and a Wi-Fi gateway—the TS21 simplifies installation while delivering effortless remote control for homeowners via the EMBER Smart Heating App.

Featuring a dual-output 2-channel receiver, the TS21 is ideal for controlling heating alongside a second independent zone, domestic hot water cylinder, or motorized zone valve. With universal 7-day, 5/2-day, or 24-hour programming options, smart TPI and Optimum Start algorithms, and seamless multi-zone app expansion, it provides an energy-efficient upgrade for combi boilers, system boilers, and modern multi-zone heating installations.

Main product features:

• Dual-Channel Control Output: Manages space heating while providing a dedicated second switched output for a domestic hot water cylinder, second heating zone, or zone valve.
• Complete Pre-Paired Pack: Includes a wireless Touch Thermostat, 2-channel receiver, and GW04 Wi-Fi gateway pre-linked out of the box for fast, hassle-free installation.
• Remote Control via EMBER App: Enables full control over heating and hot water schedules, setpoints, and boost functions from anywhere via smartphone or tablet.
• Touchscreen Display: Modern backlit touch thermostat interface with simple button controls, flexible wall-mounting or table stand positioning, and a safety PIN lock.
• Energy-Saving Algorithms: Equipped with Optimum Start (pre-heating up to 3 hours) and TPI (Time Proportional & Integral) control to prevent room overshooting and reduce fuel consumption.
• Expandable Multi-Zone Capability: Easily expands to support additional zones by pairing further EPH wireless thermostats to the same system architecture.

Technical Specifications:

Manufacturer: EPH Controls
Part Code: EMBERTS21 (TS21)
Product Type: Wireless Smart Thermostat Pack for Heating & Hot Water / 2-Zone Control
Connectivity: RF Wireless (Thermostat to Receiver) & Dual-Band Wi-Fi / Ethernet (Gateway to EMBER App)
Receiver Output: Twin Channel (2 x Volt-Free / 230V SPDT Contacts, 3A Rated)
Programming Modes: 7-Day, 5/2-Day, 24-Hour (6 time/temperature settings per day)
Temperature Range: 5°C to 35°C
Power Supply (Thermostat): 2 x AA / 4 x AAA Alkaline Batteries (depending on model variant)
Power Supply (Receiver): 230V AC ±10%, 50Hz
Primary Application: System Boilers with Hot Water Cylinders, 2-Zone Space Heating, & Motorized Zone Valves
Warranty: 5-Year Manufacturer Warranty