Numbers are room temperatures
Each number roughly corresponds to a room temperature. The exact figures vary by manufacturer, but as a rough guide, 3 is often around 20°C, with each number up or down changing it by a few degrees. The frost symbol keeps the room just warm enough to prevent freezing.
Suggested settings
A common starting point:
| Room | Typical setting |
|---|---|
| Living room | 3 to 4 |
| Bedrooms | 2 to 3 |
| Hallway and landing | 2 |
| Bathroom | 3 to 4 |
| Unused rooms | Frost or 1 |
Typical TRV settings (check your valve's instructions)
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Common mistakes
Turning a TRV to 5 won't heat a room faster – it just lets it get warmer before closing. TRVs also need air to flow around them, so curtains or furniture covering the head can cause it to switch off too soon.
