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Milano cast iron radiator assembly guide

What we’ll cover…

  • The preparation of cast iron radiator sections for assembly
  • Usage of the provided joining tool for section connection
  • Required euipment and tools for assembly
  • Step-by-step assembly guide with detailed instructions
  • Using a torque spanner to tighten connections
  • The addition of end gaskets and installation completion
  • Aftercare tips to for radiator appearance maintenance

Key tips for cast iron radiator assembly

Real cast iron radiators are a thing of beauty. But another thing they are is heavy! 

If your cast iron radiator weighs over 100kg, you will need an additional piece of kit called a joining tool to connect each section of your radiator together. 

Depending on the width of your cast iron order, the radiator may be split into 2 or more sections to ensure that it arrives safely.

This guide will show you step by step how to use the joining tool to assemble your new cast iron ready for installation. 

But first, let’s answer a couple of your FAQs.

How heavy are cast iron radiators?

At BestHeating, we are proud to currently stock a broad selection of cast iron radiator ranges from leading luxury brand Milano.

Each design ranges in weight per section depending on the radiator features. For example, the narrow linear sections of the Milano Alice will weigh less than the fuller column, detailed sections of the Milano Beatrix. 

The average weight per cast iron section is:

  • Around 6kg for a low level Alice, Isabel, Mercury & Tamara 
  • Around 10kg for the tall Isabel, Mercury & Tamara
  • Around 11-14kg for the Beatrix
Milano Cast Iron Radiator Gif

How do I know if I need a joining tool?

Whenever you purchase a cast iron radiator from BestHeating, no matter how big or small in size, our customer service team will be in touch to update you on the process. 

As soon as your order is placed, every detail will be carefully reviewed and if you have ordered a cast iron radiator over 100kg the team will let you know in your very first call or email and the tool will be included in your order.

We will also collect the tool free of charge after use.

Tools we provide

  • Radiator joining tool
  • Carry straps, these will be included in the box to ensure that the radiator can be carried safely into your home.
  • End caps
  • Graphite gaskets
  • Joining nipples
  • Gambits
Cast Iron Radiator Tools Line Drawing

Extra tools you will need

In addition to the equipment that we provide above, there are a couple of extra tools that you will need to assemble your cast iron radiator. 

Your plumber will most likely have these tools in their kit, but if not they can be found in your local DIY store or online. 

The tool sizes differ slightly for the different cast iron ranges so please make sure you have everything you need for your radiator below.

Milano Beatrix Cast Iron Radiator (2)

For Beatrix radiators, you will need:

  • Breaker bar for ¾” square drive
  • ¾” square drive
  • ¾” female to ¾” female drive adaptor
  • 41mm socket
  • ¾” Torque wrench (capable of being set to 250 Nm (180 lb/ft2) for final tightening
  • Tape measure 
  • Adjustable spanner
Milano Alice and Tamara Cast Iron Radiators

For Alice & Tamara radiators, you will need:

  • Breaker bar for ¾” square drive
  • ¾” square drive
  • ¾” female to ¾” female drive adaptor
  • 45mm socket
  • ¾” Torque wrench (capable of being set to 250 Nm (180 lb/ft2) for final tightening
  • Tape measure 
  • Adjustable spanner

How to assemble your Milano cast iron radiator

Follow the steps below to successfully assemble your Milano radiator, or click to download our line drawn cast iron radiator assembly guide.

Step 1 – Prepare the sections

Please Note: Your order will be shipped on two or more pallets. We recommend moving your radiator using the carry straps onto a single pallet for installation.

Using the shipping pallet as a secure base to work on, prepare the two radiator sections for joining.

Section A connects to Section B (and if your radiator is long enough to split into further sections, then B connects to C, C to D and so on).

If you have multiple split radiators this will be indicated with a number (e.g. A1 connects to B1, A2 connects to B2 etc).

cast iron radiator sections

Step 2 – Screw in the joining nipples & gaskets

Being sure to use the correct opposing threads, carefully screw in the joining nipples provided and put in place the graphite gaskets for the middle section connection.

hand screwing joining nipples onto cast iron radiator

Step 3 – Join the radiator

Slowly push the two sections of radiator together, being sure that the joining nipples sit neatly in the thread ready to be joined.

cast iron radiators being assembled

Step 4 – Turn the joining key

Take the radiator joining key and insert it into the radiator from one end.

Slowly make one full turn of the joining key until the centre of the radiator is brought together.

Repeat this for both the top and the bottom connections, being sure to make firm and even connections.

Cast iron radiator sections joined together

Step 5 – Tighten the sections

Using a bar or a spanner begin to tighten the top & bottom sections of the radiator.

Then, using a torque wrench, tighten each section to the recommended torque setting of 250 Nm (Newton metres) or 185 lb/ft² – being careful not to overtighten.

torque wrench tightening cast iron radiator sections

Step 6 – Add the gasket & end bush

To finish the assembly of your radiator, place the brown gambit gasket around the inlet of the end section.

Replace the end bush and tighten using a spanner and finish by tightening with a torque wrench to 250 Nm (Newton metres) or 185 lb/ft² .

cast iron radiator end cap and gambit


Keep your beautiful new cast iron radiator always looking its best with our aftercare advice below.

  • Clean any marks with a soft dry cloth.
  • For stubborn stains please clean with mild soapy water and buff out with a soft cloth.
  • Please avoid using abrasive or acidic cleaners.

For more radiator cleaning advice, visit our how to clean a column radiator guide.

If you have any questions or you are unsure about any of the steps we have mentioned in this guide, please get in touch and we will be happy to help. 

You can speak to an advisor live on our website, or send an email to info@bestheating.com

We’d love to see your cast iron radiator in its new home! Tag us on Instagram @bestheatinguk and use #mybestheating for a chance to feature on our feed.

We hope you enjoy your new cast irons!

Frequently Asked Questions

Although they are widely considered to be a traditional heating option overall, some cast iron radiators can be thought of as modern radiator replacements, and will suit contemporary settings equally as well as they will classic or retro spaces.

To find out more about these and any other modern radiator replacement styles, explore our dedicated blog, Obeying the rules of cool: a modern radiator replacement guide.

Black cast iron radiators can be considered a trendy home heating choice for 2022 and beyond. As with their modern counterparts, black cast iron radiators or other traditional designs are very well suited to almost any interior scheme.

A black cast iron radiator will make for a good addition to both classic and contemporary properties, and bring a great sense of authenticity to your home heating whatever the setting.

For further information, take a look at our blog, How To Use Black Radiators In Your Home.

You can choose to paint a cast iron radiator with specialist radiator paint such as Hammerite if you feel more comfortable doing so.

However, it is not absolutely necessary to do so. You can still achieve a lovely cast iron radiator finish when using acrylic-based spray paint, or cellulose-based paint, for example.

There’s more detailed radiator painting advice in our full Advice Centre blog, How To Paint A Radiator.

Cast iron radiators are proven to work in an energy efficient manner, with cast iron actually boasting a higher level of conductivity than steel.

As a material, cast iron may take longer to heat up than steel, but it also retains its heat better, for much longer.

A cast iron radiator will remain warm for a long while after being switched off, so it can be argued that cast iron radiators are more efficient than modern designer radiators.

Based on their properties, you might prefer to use cast iron models as opposed to bathroom radiators or use them as kitchen or lounge radiators, dependent on your specific home heating preferences.

Yes. Cast iron radiators usually take longer to heat up than other radiator types.

However, it should be noted that cast iron radiators will also typically retain their heat for longer, and stay warmer for longer when the central heating is turned off. They can do this due to the increased mass incorporated by the cast iron material.

As such, they are commonly used as kitchen or lounge radiators.

A qualified heating engineer or plumber should be called upon to install cast iron radiators.

The extra weight and bulkier design makes them more difficult to fit than standard designer radiators.

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