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How to Drain a Radiator In Simple Steps

In this blog post, we’ll explore the simple steps to drain a radiator, making it easy for anyone to understand. If you’ve ever wondered how to keep your heating system working smoothly, this guide will walk you through the process in straightforward terms. 

Radiator draining might seem a bit daunting, but with our clear instructions, you’ll be able to do it without any hassle. Whether you’re looking to fix a blockage or perform regular maintenance, these steps will help you keep your home cozy and warm. So, let’s dive in and learn how to drain a radiator step by step!

1. Turn Off Heating:

Before you start to drain a radiator, ensure that your heating system is turned off. You don’t want hot water flowing through the radiator while you’re trying to drain it. This also ensures your safety during the process.

2. Locate Radiator Valve:

Locate the radiator valve at the bottom end of the radiator. It might be covered by a plastic cap. The valve is responsible for controlling the flow of water in and out of the radiator. It’s important to find the right valve, as some radiators might have more than one.

3. Place Container:

Position a container or towel beneath the valve to catch any water that might spill out during the draining process. This prevents water from damaging the floor or carpet.

4. Open Valve:

To release the water, use a radiator key or a flathead screwdriver. Gently turn the valve counterclockwise to open it. Be cautious, especially if the system has been recently on, as the water could be hot. If you notice a slow trickle or no water coming out, it might mean there’s an airlock; in that case, you might need to open the air vent at the top of the radiator.

5. Let Water Drain:

Allow the water to drain out fully into the container to drain a radiator. Depending on the size of the radiator, this could take a few minutes. You might hear air hissing as the water drains; this is normal.

6. Close Valve:

After the water stops flowing, gently turn the valve clockwise to close it. If you opened the air vent, make sure to close it too. This prevents water from leaking when you refill the radiator.

7. Refill Radiator:

To refill the radiator, locate the filling loop. It’s a pipe connected to the heating system, often near the boiler. Slowly turn the valve to allow water to flow back into the radiator. While doing this, keep an eye on the pressure gauge on your boiler or heating system. Make sure it’s at the recommended pressure level.

8. Check for Leaks:

After refilling, inspect the area around the valve for any signs of leakage. If you notice any leaks, you can try gently tightening the valve to secure it. Properly sealing the valve is essential to prevent future issues.

9. Turn On Heating:

Once you’re sure everything is secure and there are no leaks, you can turn your heating system back on. Check the radiator to ensure it heats up properly. This confirms that water is flowing through the system as expected.

Remember, if you’re not comfortable performing these steps or if you’re unsure about any aspect of the process, it’s recommended to seek assistance from a professional to avoid any mishaps or damage to your heating system.

Choosing Premier Drain Services in Dorchester To Drain a Radiator

Local Expertise and Quick Response:

Opting for Premier Drain unblocking services in Dorchester means benefiting from their local presence. Their proximity ensures rapid response times, allowing them to promptly address your radiator draining needs. With a quick turnaround, you won’t have to endure prolonged discomfort caused by a malfunctioning radiator.

In-Depth Area Knowledge:

Being located in Dorchester provides Premier Drain Services with a deep understanding of the local plumbing landscape. Their familiarity with the area’s plumbing systems, common issues, and infrastructure intricacies enables them to navigate and resolve your radiator draining efficiently and effectively.

Professionalism and Tailored Solutions:

Premier Drain Services brings a wealth of experience to the table, ensuring a high level of professionalism in their services. They understand that each situation is unique. By combining their expertise with their local insights, they can offer personalized solutions that cater to your specific radiator draining requirements.

Community-Focused Accountability:

As a local service provider, Premier Drain Services takes pride in serving the Dorchester community by providing drain a radiator services. This sense of community accountability translates into their commitment to delivering quality service that meets the needs and expectations of their fellow residents. Choosing them means choosing a partner who is dedicated to enhancing the plumbing systems within the community.

Versatile Plumbing Solutions:

Beyond radiator draining, Premier Drain Services offers a comprehensive range of plumbing solutions. This versatility positions them as a one-stop solution for all your plumbing needs. Establishing a relationship with them ensures you have a reliable and knowledgeable resource for any plumbing issue that may arise in the future.

Frequently Asked Questions

How do you drain water from an old radiator?

To drain water from an old radiator, follow these steps: First, turn off the heating system to ensure the water isn’t hot. Locate the radiator’s valve, usually at the bottom end; you might need a radiator key or a wrench to open it. Place a container beneath to catch the water.

Turn the valve counterclockwise to release the water; be cautious, as it could be hot. Once the water stops flowing, close the valve by turning it clockwise. If the radiator has an air vent, you might need to open it to let air in for smoother draining. To refill the radiator, locate the filling loop (if your system has one) and slowly turn the valve to let water in. Finally, check for leaks and turn the heating system back on to ensure everything’s working as expected. If unsure, seek professional help.


In conclusion, draining a radiator doesn’t have to be complicated. By following these simple steps, you can ensure that your heating system functions efficiently and keeps your home comfortable. Regular maintenance like radiator draining can go a long way in preventing issues and extending the lifespan of your heating system. 

Remember, taking the time to learn to drain a radiator empowers you to take care of your home and save money on potential repairs. So, the next time you need to drain a radiator, you can approach the task with confidence, knowing that you have the know-how to keep your heating system running smoothly.


Date: 17/08/2023

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