We now offer traditional cast iron radiators pre-fitted with the electric heating elements and end caps required to convert them into fully self-contained electric radiators. These units are shipped pre-assembled, but you’ll still need to fill them with water and complete the installation. Here's how to do it.
Important: We strongly recommend using a qualified electrician to complete any electrical work.
1. Installing the Heating Element
Start by carefully following the instructions provided with your electric heating element. The element must always be installed in the bottom of the radiator to ensure it remains fully submerged during use. Do not fit the heating element at the top of the radiator.
Screw the heating element into the appropriate bottom end cap and ensure it is tight and secure. Use the small amount of Loctite (or similar thread sealant) provided with the heating element to ensure a watertight seal. Let the sealant dry fully before proceeding.
2. Fitting the End Caps
Fit the remaining end caps at the opposite end of the radiator. Leave the top end cap above the heating element open, or unscrew it if necessary — this is where you’ll fill the radiator with water later. Again, make sure all other end caps are firmly tightened.
3. Filling the Radiator with Water
Before filling, tilt the radiator so that the top inlet (the one above the heating element) is the highest point. If the radiator is small enough, carefully stand it upright on one end. Always get help when lifting — cast iron radiators are extremely heavy.
If the radiator is too large to stand vertically, lift the end with the heating element to create a slope and rest the radiator securely (e.g., on a step) while filling.
Now, fill the radiator with a mix of water and central heating inhibitor (we recommend Fernox). Once you believe it’s full, gently rock or shake the radiator to dislodge any trapped air, then top it up. Repeat this process until the radiator is completely filled and free of air pockets.
Finally, screw in and tighten the last end cap — this should normally be the one with the bleed valve.
4. Wiring the Element
The heating element now needs to be connected to your mains power supply.
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Low-wattage elements can typically be fitted with a standard UK plug and plugged into a wall socket.
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High-wattage elements (2.5kW or 3kW) must be wired by a qualified electrician into a fused spur, in accordance with UK electrical regulations.
We hope you enjoy your new electric cast iron radiator. With proper installation and care, it should keep your space warm and cosy for many years to come!
