Upgrading your home’s heating system with thermostatic radiator valves can improve energy efficiency and comfort. These devices allow you to control the temperature in individual rooms. In the video above, This Old House plumbing and heating expert Richard Trethewey demonstrates how to install a thermostatic radiator valve. We break down his steps below so you can follow along.
How Thermostatic Radiator Valves Work
Thermostatic radiator valves control heat output from individual radiators. By installing these, you can create zones within your heating system for strategic temperature control in different areas of your home. This is especially beneficial in larger homes or rooms that aren’t used frequently.
Traditional radiator valves don’t adjust for room temperature changes, which can lead to overheating and wasted energy. Thermostatic valves prevent this by regulating heat output more precisely. Thermostatic radiator valves contain a temperature-sensitive element that expands or contracts based on the room’s temperature. This adjusts the valve’s opening, regulating the flow of hot water into the radiator. As a result, the radiator’s heat output is adjusted to maintain the desired room temperature.
In addition to lowering your energy bills and improving your home’s comfort, thermostatic valves can reduce the strain on your boiler and other components of your heating system, potentially extending their lifespan. By using less energy to heat your home, they also lessen your carbon footprint.
Preparing for Installation
Start your project by gathering the necessary tools and materials.
Tools and Materials Needed
- Drill/driver with a 3/8-inch twist bit
- New thermostatic radiator valve
- Pipe dope
- Pipe wrenches
- Single-strand wicking
- Spud wrench
- Thread sealant
- Zip screws
Safety Precautions
Before starting the installation, turn off the heating system and allow the radiator to cool completely. Place drop cloths on the floor to protect the surrounding work area.
Step-by-Step Installation Process
Follow the steps below to successfully install your thermostatic radiator valves.
1. Draining the Radiator
Begin by draining the water from the radiator. This step will prevent water damage and make the valve removal and installation easier.
2. Removing the Old Valve
Use pipe wrenches to disconnect the old valve from the radiator. In the video, Trethewey demonstrates how to loosen and remove the valve body from the threaded pipe.
3. Removing the Spud
The spud is a threaded fitting that connects the valve to the radiator. Use a spud wrench to remove it, as shown in the video. The spud has small nubs that require this specialized tool.
4. Preparing the New Spud
Apply thread sealant to the first few threads of the new spud. Then, wrap single-strand wicking around the threads. This combination helps create a tight seal between the new threads and the old threads in the radiator.
5. Installing the New Spud
Use the spud wrench to install the new spud into the radiator, making sure it’s tightened securely to prevent leaks.
6. Preparing the Existing Pipe
Apply pipe dope and single-strand wicking to the threads of the existing pipe. This step helps create a secure connection between the pipe and the new valve.
7. Installing the New Valve
Carefully thread the new thermostatic radiator valve onto the existing pipe. Use a pipe wrench to tighten it securely.
8. Sealing the Connection
Apply pipe sealant to the face of the spud before connecting it to the new valve. This extra step gives the valve a watertight seal.
9. Tightening the Connections
Use pipe wrenches to tighten the connection between the spud and the new valve. Be careful not to overtighten, which could damage the components.
10. Installing the Sensor
For radiators with covers, you’ll need to install the temperature sensor. Here’s how:
- Drill a small hole in the radiator cover.
- Feed the sensor wire through the hole.
- Secure the sensor to the side of the radiator cover using zip screws.
- Connect the sensor wire to the valve.
11. Finishing Touches
Replace the radiator cover and check that the sensor wire isn’t kinked or damaged. Make any final adjustments to the valve’s position until it’s properly aligned.
Programming and Using Your New Thermostatic Radiator Valve
Once installed, your new thermostatic radiator valve will need to be programmed and adjusted for best performance.
Setting the Desired Temperature
Most thermostatic radiator valves have a numbered dial corresponding to different temperature settings. Consult your valve’s manual to understand the temperature range and set it accurately.
Adjusting for Different Times of Day
Some advanced thermostatic radiator valves let you program different temperatures throughout the day. This feature helps you save energy when rooms are unoccupied.
Maintenance Tips
To keep your thermostatic radiator valves functioning properly, regularly check for leaks around the valve and connections. Clean the valve and sensor as needed to remove dust and debris. Test the valve’s responsiveness by adjusting the settings and monitoring room temperature.
Troubleshooting Common Issues
Even with careful installation, your new thermostatic radiator valves may have some issues, including unresponsiveness to temperature changes, heating issues, and leaks. Here are some solutions to try.
Valve Not Responding to Temperature Changes
If the valve doesn’t seem to be adjusting to temperature changes, check that the sensor is properly connected and positioned. Also, make sure it’s not affected by drafts or direct sunlight.
Radiator Not Heating Properly
If the radiator isn’t heating as expected, bleed the radiator to remove any trapped air. Also, check that the valve is fully open and that there are no blockages in the system.
Leaks Around the Valve
For any leaks, first, try tightening the connections. If the problem persists, you may need to reapply thread sealant or replace damaged components.
Installing thermostatic radiator valves is a great upgrade for any home heating system, and you can complete the project yourself with basic plumbing skills. However, if you’re unsure or uneasy about any part of the process, it’s best to consult or hire a professional.
