T19WHB Zigbee OpenTherm Boiler Thermostat Kit for S/Y-Plan

OpenTherm technology enables two-way digital communication between the thermostat and the boiler. Unlike traditional on/off controls, T19WHB modulates the boiler's output based on real-time demand — maintaining precise temperature while reducing fuel consumption by up to 15-20%.

Specifically designed for UK S-Plan (two 2-port valves) and Y-Plan (single 3-port mid-position valve) heating systems. T19WHB provides independent scheduling and control for both Central Heating (CH) and Domestic Hot Water (DHW) — a direct drop-in replacement for existing UK dual-channel programmers.

Built on the Zigbee protocol, T19WHB operates on a low-power mesh network that extends range and reliability through each connected device. It consumes significantly less power than Wi-Fi alternatives, extending battery life while maintaining stable communication even in larger homes.

Powered by standard AA batteries, T19WHB requires no wiring between the thermostat and the heating system. The wireless receiver connects directly to your boiler, while the thermostat can be placed anywhere within range — making installation quick, clean, and non-disruptive.

T19WHB comes with a wall-mounting bracket and a tabletop stand, offering maximum placement flexibility for any room layout. Whether you prefer it mounted on the wall or placed on a shelf or desk, installation takes seconds without any tools.

T19WHB provides unified control for the entire heating system through a single thermostat. Unlike zone-based systems that require separate controls for each room, this model manages whole-home heating from one central point — simplifying operation while maintaining consistent temperature across all areas.