For new occupants or the frugal, this task may seem complex. Rest assured, it's just a matter of understanding how your heating system works. In fact, some innovative models, like those from Ciarra, spare you this step. Grab your cloth and follow this guide!
Radiator Bleeding: What Are We Really Talking About?
In fact, it's a simple maintenance operation, absolutely essential for "water-based" heating systems (central heating boiler, hydraulic circuit). The principle is to expel the air that has trapped itself in the hot water circuit of your installation. By bleeding your radiators, you allow them to regain their optimal efficiency. And the best part is that the operation only takes a few minutes!
Why and When Should You Bleed Your Radiator?
A radiator that gurgles, whistles, or stays cold at the top... These little signs are unmistakable: air has sneaked into the circuit. And even though this air might be subtle, it disrupts the entire heating system. When it circulates through the pipes, it prevents the hot water from reaching certain parts of the radiator.
You can quickly spot a radiator that needs to be bled. The top remains lukewarm, the bottom heats up a lot, or you may hear a slight gurgling noise when you start the heating. These signs indicate poor circulation. Bleeding your radiator at the right time ensures good performance for the whole system. Ideally, you should do it once a year, just before the heating season, when temperatures drop.
However, if your system remains sluggish, a descaling might be the solution. That said, not all radiators require bleeding!
Which Types of Storage Heaters Should Be Bled?
The need for bleeding depends entirely on the technology of your appliance. In the case of storage heaters, there are two main types:
Fluid-based Storage Heater
It contains a heat-conducting liquid (usually oil or glycol) which is heated by a resistor. This fluid accumulates and then diffuses the heat. Since this system is a closed circuit, it may, very rarely, require intervention if air bubbles enter it. In this case, specialized electric radiator maintenance would be needed.
Dry Storage Heater
It uses a solid heat core, often ceramic, cast iron, or stone. The heat is generated by a resistor, stored by this material, and then radiated. This system contains no fluid or water.
Central Heating Radiators
Ciarra’s dry storage heater models do not contain any internal liquid. And since there’s no water or oil, there’s no air to expel. This means they do not require any bleeding!
How to Bleed Your Radiators in 6 Steps?
To properly bleed your radiators and ensure they work effectively, follow these detailed steps:
Turn off the heating and let it cool
Before starting, turn off the central heating and wait for the radiators to cool down. This prevents any risk of burns as the water inside the radiators can be very hot. Take a moment to ensure the heating system is fully off for added safety.
Gather your bleeding kit
You’ll need a few simple tools to bleed your radiators:
A bleed key (usually provided with the radiator or available in stores)
A small container (such as a bucket or tray) to catch the water
A cloth or sponge to wipe off any water droplets that may escape during the process
Make sure you have everything at hand before starting.
Locate the radiator bleed valve
Identify the location of the bleed valve on each radiator. It’s usually a small screw or valve located at the top of the radiator. If you have multiple radiators to bleed, always start with the one closest to the heating circuit. This allows the air to escape efficiently and ensures an optimal bleed.
Open the bleed valve slowly
Using the bleed key (or a screwdriver if it’s a screw-type valve), open the valve very slowly. You will first hear a hissing sound: this is the air escaping from the radiator. Let the air escape until you hear water begin to flow, without splashing. This means the air has been completely expelled and clean water is now flowing.
Wait for clear water and close the valve gently
Once the water begins to flow steadily and without bubbles, you can close the valve. Be careful not to force it shut to avoid damaging the mechanism. If too much water escapes, it’s a sign that the pressure in your system is too high. You may need to adjust the pressure of the boiler after bleeding all the radiators.
Check the boiler pressure and adjust if necessary
After bleeding all the radiators, it’s important to check the pressure of the boiler. The pressure should be between 1 and 1.5 bar (check your boiler manual to be sure). If the pressure is too low, you may need to add some water to your heating system to bring it to the optimal level.
And that's it!
Once these steps are done, your radiators should be free of air and work more efficiently. You will likely notice an improvement in the warmth of your home and a more even heat distribution.
The Solution to Avoid Having to Bleed Your Radiators: The Electric Storage Heater
The solution to skip the task of bleeding your radiators? Switch to a dry electric storage heater.
What Is It and How Does It Work?
An electric storage heater works like a heat accumulator. It consists of a solid or fluid core, heated by an electric resistor. This core stores the heat and then slowly and steadily releases it into the room, even after the resistor has turned off. This principle is similar to a good wood stove fire, without the downsides of soot and logs.
Its Advantages Over Traditional Heaters
Electric storage heaters stand out for their complete independence from a water-based boiler. Without fluid inside, they eliminate any risk of leaks. Their heat-accumulating core diffuses a steady heat without fluctuations. By only heating to recharge, they optimize energy consumption. Lastly, they are easy to install and their sleek design fits into any interior.
How to Maintain an Electric Storage Heater
If the question of how to bleed an electric radiator is settled (the answer is: never!), it’s wrong to think the device needs no attention. Here are simple actions to keep your equipment in top shape.
Regular Cleaning
The biggest enemy of even heat distribution is dust. It blocks heat diffusion and sometimes creates a burning smell. Wipe down with a dry microfiber cloth or vacuum with a brush attachment once a month.
Checking Smart Features
If your appliance is smart, check that the WiFi, programming, and window-opening detection functions are working well. A well-set thermostat can reduce consumption by 15 to 25%.
Annual Safety Checks
Inspect cables, fixtures, and signs of overheating. Also, check the warranty and after-sales service to prolong its lifespan.
Top 2 Best Electric Storage Heaters in France for 2025
The following models simplify your life and radiator maintenance:
CIARRA Ceramic Storage Heater WiFi (CBHTD)
Advantages:
Dry storage = no bleeding, no fluid
Double ceramic heat core + aluminum film
WiFi control + ultra-precise weekly programming
Automatic window-opening detection (up to 30% energy saving)
Compact modern design. 3 power levels (1000W / 1500W / 2000W)
Disadvantages:
Slightly higher price (around €150 for the WiFi model)
Requires WiFi for advanced programming functions
CIARRA Standard Ceramic Storage Heater (CBHT)
Advantages:
Excellent value for money
Maintenance-free technology (no fluid, no bleeding)
Precise electronic thermostat
Simple and quick installation
Disadvantages:
No WiFi connectivity
Manual programming
FAQ: We Answer All Your Questions About Radiator Bleeding
How often should you bleed your radiators?
Once a year, before the heating season. If you hear noise or notice cold spots, intervene right away.
In what order should you bleed the different radiators?
Start with the radiator closest to the boiler, then work towards the farthest one. In a house with multiple floors, start with the ground floor before moving up.
Does my electric radiator need to be bled?
If you have a dry storage electric radiator, the answer is no, never! For a fluid-based storage heater, it's rare, except if the heat is uneven.
Bleed it yourself or call a plumber?
Yes, unless the water is black or the pressure drops... then call a pro!