Radiator Valves

Radiator valves control the flow of hot water into your radiator, helping you manage the temperature of individual rooms. With different types, shapes and finishes available, choosing the right valve depends on your radiator, pipework and heating setup. Find out more with our frequently asked questions about radiator valves.

 

What are the different types of radiator valves?

Radiator valves come in different types and shapes, with the right option depending on how you want to control your heating and how your radiator connects to the pipework.

In terms of function, the main options are manual radiator valves and thermostatic radiator valves (TRVs):

• Manual radiator valves allow you to adjust the flow of water through the radiator by turning the valve, giving you straightforward control over its heat output.
• Thermostatic radiator valves use a built-in thermostat to regulate the radiator based on the room temperature. This allows you to set a preferred temperature and can help prevent rooms from becoming unnecessarily warm.

Radiator valves are also available in different shapes, including angled, straight and corner valves. The best option depends on the position of the radiator connections and where the pipework enters the radiator.

 

Should I choose manual or thermostatic radiator valves?

The choice depends on how much control you want over the temperature of each room. Manual radiator valves offer simple, straightforward control, while thermostatic radiator valves (TRVs) automatically adjust the radiator as the room temperature changes.

TRVs can be particularly useful if you want to set different temperatures in different rooms and avoid heating spaces more than necessary. Consider your heating requirements and the level of control you want when choosing between the two.

 

What shape radiator valves do I need?

The right radiator valve shape depends mainly on the position of your radiator connections and where the pipework enters the radiator. 

• Angled radiator valves are commonly used where the pipework needs to turn through 90 degrees
• Straight radiator valves are suitable where the pipework and radiator connection are aligned
• Corner radiator valves can be useful where the connections sit close to the wall.

You can also choose from different valve designs, including cross head and square styles, allowing you to match the look of your radiator and wider decor. 

Check your radiator connections and pipework configuration before buying to make sure you choose a compatible valve.

 

What size radiator valves do I need?

The size of radiator valve you need depends on the connections on your radiator and pipework. While many modern radiators use standard connections, sizes and fittings can vary, so it's important to check your radiator's specifications before buying.

As well as the connection size, consider the valve’s shape and whether you want manual or thermostatic control. Checking these details before purchasing will help ensure your new valves are compatible with your radiator.

 

Do all radiator valves fit all radiators?

Valves for radiators vary in shapes and sizes, but they typically fit most modern heating systems due to the universal connection size between the valve and radiator. 

Although many modern radiators use standard connections, you still need to consider the connection size, position of the radiator inlets and the direction of the pipework.

The type of valve also matters. For example, angled, straight and corner valves are designed for different pipework configurations, while H-block valves are designed for radiators with central connections. Always check the radiator and valve specifications before buying.

 

What is the difference between a lockshield and radiator valve?

A lockshield valve controls the flow of water leaving the radiator and is normally fitted alongside a control valve or TRV. It is usually covered with a cap to prevent its setting from being changed accidentally.

The other radiator valve controls how much water enters the radiator. A manual valve allows this to be adjusted by hand, while a TRV automatically regulates the flow based on the room temperature. Both valves play an important role in controlling and balancing your heating system.

 

Can you fit new radiator valves without draining the system?

A single radiator valve can sometimes be replaced without draining the entire heating system, but the radiator will still need to be isolated and the water contained or removed as required. The exact process depends on the type of heating system and the work being carried out.

If you're unsure about replacing radiator valves yourself, it's best to use a qualified heating professional, particularly when working on a pressurised or sealed heating system.