Drayton Wiser Smart Thermostat Kit 1

User discussions center heavily on a fundamental limitation of TRV-based systems: temperature sensors located near radiators read higher than actual room temperature. Multiple Reddit users across threads confirm this is not Drayton-specific but affects all TRV systems (Tado, Honeywell Evohome, etc.). Solutions discussed include: manual offset calibration (Tado reportedly has a built-in offset function), adding separate wireless temperature sensors, and simply adjusting setpoints by feel rather than trusting the number. One user with a Nuve thermostat reported a 7-degree ambient temp discrepancy with no way to recalibrate. Deadband settings (+/-1 or +/-2 degrees) are noted as affecting cycling frequency. Users with ZWave TRVs apply offsets at the controller level. Practical advice dominates: 'bump the number down and focus on your comfort rather than the set number.' The Drayton system is noted as requiring a hub with matching Wiser TRVs. Users mention leaving one radiator without a TRV (bathroom/hallway) to protect the boiler from deadhead scenarios. One user running Home Assistant with Drayton reports reliable operation with room-level scheduling (office warmed on WFH days). A clear theme is that smart thermostat value comes primarily from scheduling unused rooms to lower temps, not from precision temperature measurement.

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