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53 at LWT 55°C (A++) per EN 14825
Stainless Steel Heat Exchanger
Ramses II & III RF protocol — backwards compatible with existing Honeywell Home RF products including BDR91A
set at 120mm centres to support 16mm pipework
ar-callout
ESi ESRTP4+ Wired Programmable Room Thermostat with OpenTherm Sensor 53 at LWT 55°C (A++)The ESi ESRTP4+ is a wired programmable room thermostat that combines time and temperature control in a single wall mounted unit, without a separate RF receiver to install. It provides the same core energy saving intelligence as the wider ESi programmable range, including Chronoproportional Control (TPI), Delayed Start, Optimum Start, and Optimum Stop, alongside an OpenTherm interface for compatible boilers. Wired directly into the heating circuit via
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