What You'll Need to Fit TRVs
Fitting Thermostatic Radiator Valves (TRVs) yourself is a rewarding way to gain better control over your home's heating and reduce energy bills. This guide covers the essentials you need to get the job done affordably. Before you start, ensure you have the correct type of valve for your radiator and pipework; the most common types are angled and straight, but ensure compatibility. You'll also need a few basic tools.
- Gather correct valve type (angled/straight).
- Prepare necessary tools before starting.
- Understand valve connection types.
- Prioritise safety by draining the system.
To successfully fit TRVs, you will need the valves themselves, of course. It’s worth checking if your existing radiator valves are compatible or if you need to replace the entire valve body. Many modern TRVs use a push-fit connection, often for 10mm pipework, which simplifies installation considerably compared to older compression fittings. However, if you’re dealing with older systems, you might need specific adaptors or a full valve replacement.
The tools are fairly standard for plumbing tasks. You’ll likely need an adjustable spanner or a pipe wrench for any necessary disassembly and reassembly of the existing valve or pipework. A bucket and some old rags or towels are crucial for catching any residual water. Some plumbers recommend PTFE tape or pipe jointing compound for threaded connections to ensure a watertight seal, though many push-fit systems do not require this.
Safety first: Always turn off your central heating system and allow it to cool down completely. You’ll then need to drain the radiator you’re working on. Open the radiator bleed valve at the top and place a bucket underneath the drain-off valve at the bottom to catch water. Loosen the lockshield valve on the opposite side of the radiator to the TRV, and then remove the old valve.
Step-by-Step: How to Fit Your New TRVs
Once you've gathered your materials and prepared the radiator, the actual fitting process is quite straightforward. The aim is to create a secure, leak-free connection that allows the TRV to regulate temperature effectively.
Begin by fitting the new TRV head onto the valve body. If you bought a combined valve and head, you’ll skip this. For separate parts, ensure the head is set to a low temperature or a frost setting before attaching it. This prevents it from activating prematurely. Then, carefully screw the valve body onto the radiator tail using your spanner. Tighten it enough to create a seal, but avoid overtightening, which could damage the threads or the valve itself.
For push-fit valves, the process is simpler. Once the old valve is removed and the pipe end is clean, simply push the new valve onto the pipe until it clicks into place. Ensure it's fully seated. If you are fitting angled radiator valves, ensure the angle directs the pipework neatly away from the wall, just like the old one did.
After fitting the TRV, slowly refill your heating system. Open the bleed valve on the radiator you worked on until a steady stream of water emerges, then close it. Turn your heating system back on and check all connections for leaks. Allow the radiator to heat up and test the TRV head by turning it to different settings. You should feel the valve closing and opening as the temperature changes.
Achieving precise room temperatures and saving on energy bills is entirely within reach by correctly fitting TRVs yourself.
Double-check the orientation of angled radiator valves before tightening; they need to align with your pipework for a neat and functional installation.
Maximising Savings and Avoiding Pitfalls
Fitting TRVs is a fantastic DIY project for budget-conscious homeowners looking to improve heating efficiency. While the installation itself is manageable, understanding how to use them and what common issues to avoid will further enhance your savings and comfort.
One common pitfall is incorrectly installing the valve. For instance, some people fit TRVs on the return pipe instead of the supply, rendering them ineffective. Always identify the hot water inlet pipe and attach the TRV there. Another mistake is not bleeding radiators properly after refilling the system, leading to cold spots or inefficient heating. Ensure all air is expelled.
Are smart radiator valves worth it? For many, traditional TRVs offer excellent value. They provide proportional control, meaning they can automatically adjust the radiator's output to maintain a set temperature, preventing overheating and wasted energy. This means you're not heating rooms to unnecessarily high temperatures, leading to tangible savings on your energy bills. While smart valves offer remote control and scheduling, standard TRVs are a highly affordable way to achieve significant efficiency gains.
Choosing the Right Valve Type
When selecting TRVs, consider the valve body shape (angled or straight) to match your radiator and pipe configuration. If you're unsure about your existing pipe size, a 10mm push fit radiator valve is a popular, user-friendly option for many modern systems. For older, threaded systems, you may need to measure the thread size or consult a professional. Anthracite radiator valves or antique brass thermostatic radiator valves are available if aesthetics are a concern, but ensure they are functional and compatible with your system.
Do not fit a TRV onto the radiator connecting to your main boiler feed or return pipe; this is usually a fixed valve and is essential for system balancing.
By following these steps and being mindful of common errors, you can successfully fit TRVs, leading to a more comfortable and cost-effective home environment.