A bypass radiator is a radiator in a central heating system that is intentionally left permanently switched on. This ensures continuous water flow even when other radiators are turned off.
Purpose of a Bypass Radiator
The primary purpose of a bypass radiator is to:
- Maintain Minimum Flow: Ensure a constant flow of water through the central heating system, preventing pressure build-up when thermostatic radiator valves (TRVs) on other radiators close.
- Protect the Pump: Prevent the pump from working against a closed system, which can lead to damage.
- Provide Constant Heat: Offer a heat source even when other radiators are off.
Characteristics of a Bypass Radiator
- Always On: It's designed to remain on, regardless of the settings on other TRVs.
- Location: Often located in a bathroom as a towel rail, providing constant warmth, or in the same room as the room thermostat.
Examples
- A bathroom towel rail that is always on, providing warmth and acting as a bypass.
- A radiator in the same room as the main thermostat, ensuring that the thermostat accurately reflects the overall temperature.
Why is it Important?
Leaving one radiator permanently on:
- Prevents the central heating system from becoming completely closed off when all TRVs are shut.
- Helps to maintain a consistent temperature in at least one area of the house.
- Protects the pump from damage.
