300cm-External-Sensor Digital Thermostat

Physical specs: 9.5 × 9.5 × 3.2 cm, 180 g. Temperature range: 5–40 °C. Accuracy: ±0.5 °C. Core components: built-in aluminium sensor, 300 cm shielded external sensor cable, rotary knob actuator, red LED status indicator. Housing: UL94 V-0 ABS plastic. Power: derived from connected heating circuit (230 V AC or 24 V AC). Engineered for real-world UK installation constraints — including narrow cavity walls, congested boiler cupboards, and listed building restrictions — this thermostat prioritises physical flexibility over digital complexity. Its 300 cm external sensor enables precise placement independent of thermostat mounting location, while the aluminium sensor ensures minimal thermal lag. Compatibility spans electric underfloor heating controllers, two-port motorised valves in wet systems, and standard gas boiler demand terminals. Ideal for landlords managing portfolios of older London flats or Manchester terraces where tenant-proof simplicity matters; also used by heating engineers specifying future-proof controls for heat pump readiness (via voltage-free switching). The absence of cloud connectivity meets growing UK consumer preference for privacy-first, locally operated home systems — particularly relevant post-GDPR and amid rising concerns over IoT device vulnerabilities.