UK trade guideControls & Valves 5 min readUpdated 9 July 2026

How to Fit a Room Thermostat (UK)

Install a Honeywell, Drayton, Salus or Hive room thermostat. Wired and wireless, 2-wire and 3-wire.

HoneywellDraytonSalusHiveNest

Location matters

Chest-height (1.5 m). Internal wall. Away from radiators, sunlight, kitchens, draughts. Corridor central to living areas ideal.

Wiring

  • 2-wire (dry-contact) — live-switched-live to boiler ON terminal.
  • 3-wire — L, N and switched L. Modern digital and smart stats.
  • Wireless — battery-powered thermostat + wired receiver at boiler.

Frequently asked questions

Where should the thermostat NOT go?
Hallways with front-door draughts, above radiators, in south-facing sun. Living room is best.
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