Manual Radiator Valves

If you’re looking to buy new radiator valves, then our FAQs will help you to understand the functionality and distinct traits of manual valves. Find out what they are and how they differ from thermostatic valves.

What is a manual radiator valve?

Manual valves are perhaps still the most common type of radiator valve. You operate them by manually turning them to regulate the temperature. Similar to a tap and involving an internally-controlled on/off mechanism, they adjust the flow of hot water from the boiler into the radiator. Elevating the valve level increases the hot water volume, intensifying heat output.

What is the difference between thermostatic and manual radiator valves?

The key distinction lies in how these valves manage radiator heating. Manual valves require manual toggling for heating control or rely on timed central heating systems. On the other hand, thermostatic radiator valves (TRVs) integrate sensors that autonomously activate or deactivate based on room temperature.

It is very easy to operate your central heating system with manual valves and, because they are easy to find, there will often be a wide range of styles, colours and finishes to choose from. However, regulating room temperature becomes more challenging as these valves rely on a basic turn-up or turn-down mechanism. They also lack automation, meaning your radiators won't adapt automatically to temperature changes.

Should manual radiator valves be fully open?

Manual radiator valves don't need to be fully open all the time. If left fully open, they can cause an imbalance in your heating system. To achieve an even distribution of heat throughout your home, it's important to balance your radiators.

Balancing ensures that all radiators receive the right amount of hot water. By adjusting the lockshield valve – typically the one you can't turn by hand – you control the flow of water into each radiator. This process prevents some radiators from getting excessively hot while allowing others to warm up properly, especially those farther away from the boiler.