Which Radiator Valves Do I Need?
Selecting the correct radiator valves is a critical step in any heating installation or upgrade, yet the variety of shapes and styles can be overwhelming. The choice is determined by three specific technical factors: your pipework orientation, the position of the radiator inlets, and your preferred control method.
Whether you are installing a new designer radiator or simply replacing an old unit, getting the valves right ensures a leak-free connection and efficient temperature regulation.
This guide simplifies the selection process into three actionable steps, helping you distinguish between angled, straight, and H-block valves while optimizing your system for energy efficiency.
How do you choose the right radiator valves?
Choosing the right valves might seem like a simple task, but there are a few things to check before you make a purchase. Which radiator valves you need depends on where your pipework comes from, where the radiator inlets are located, and the style you are looking for.
Step 1: Check your pipework
Look at where the central heating pipes emerge. Do they come up from the floor, out from the wall, or run along the skirting board? If you are replacing an existing radiator without moving it, the pipework won’t change. If you are installing a radiator in a new location, you can choose the pipework direction, but it is best to consult your plumber first.
Step 2: Find the radiator inlets
The inlets are where the valves connect the radiator to your heating system. Most radiators have inlets at the bottom on each side, but some modern designs feature middle connections (underneath in the center) or inlets directly underneath the side panels.
Step 3: Choose your valve shape
The shape of the valve dictates how it manages the transition between the pipe and the radiator. Use the table below to find the correct fit for your setup.
| Radiator Inlet Position | Pipework Through Wall | Pipework Through Floor | Pipework Along Wall |
| Side Inlets | Angled / Corner | Angled / Corner | Straight |
| Bottom Inlets | Angled / Corner | Straight | Corner |
| Middle Inlets | Angled H-Block | Straight H-Block | Corner |
What is the difference between manual and thermostatic valves?
Once you know the shape you need, you must decide between manual or thermostatic operation.
Manual radiator valves
Manual valves function like a tap. You turn them by hand to allow water into the radiator. They are simple to use but require constant manual adjustment to manage room temperature and energy bills.
Thermostatic Radiator Valves
TRVs sense the air temperature in the room and automatically adjust the flow of water to maintain a consistent heat level. These are highly recommended for reducing energy consumption. However, you should avoid using a thermostatic radiator valve in the same room as your main wall thermostat, as they will compete and cause inefficient heating. It is also best practice to use manual valves in bathrooms, as steam and humidity can interfere with thermostatic radiator valve sensors.
What styles are available for radiator valves?
After the technical requirements are met, you can choose a style that complements your interior design.
Modern vs. Traditional styles
For contemporary homes, minimalist chrome or matte black valves offer a sleek finish. If you have a period-style home or a traditional column radiator, you might prefer antique brass or brushed copper valves with classic tap style handles.
Modern styles
Traditional styles
Frequently Asked Questions
| Question | Answer |
| What is the difference between straight and angled valves? | Straight valves have no bends and connect pipes running in a straight line. Angled valves connect pipes at a 90-degree angle. |
| What are the two valves on a radiator called? | One is the flow valve (where you control the heat) and the other is the lockshield valve (used to balance the system). |
| Do I need different valves for towel rails? | No, heated towel rails follow the same rules as radiators. Most require angled valves as the pipes usually come from the floor or wall. |
Conclusion
Choosing the right radiator valves is essential for both the functionality and the aesthetic of your heating system. By accurately identifying your pipework position and radiator inlet locations, you can easily determine whether you need straight, angled, or H-block valves. Upgrading to thermostatic radiator valves is a smart investment for energy efficiency, though manual valves remain a reliable choice for bathrooms and rooms with wall thermostats. With the technical groundwork complete, you can confidently select a finish from Bathroom Mountain that perfectly matches your radiator and decor.
