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Replacing Radiators with Larger Ones


There are a few reasons why you might look to replace your radiators. Perhaps you’re looking to upgrade to modern radiators, or you’re interested in designer radiators. Alternatively, you might be looking for larger radiators, increasing the overall heat output into your house.


In this blog post, we’ll look at how much difference larger radiators make, as well as the process and benefits of making this change.

Can you replace a radiator with a bigger one?

Yes, in most cases, you can replace a radiator with a bigger one. Whether it’s to increase heating efficiency in a room, or to better match the aesthetics of your space, it’s generally possible to do.

However, before you make this decision, you need to consider:

  • Pipework - Is the pipework in your property suitable to accommodate a larger replacement?

  • Optimal radiator size - Do you actually need to upgrade?
  • Fitting - If pipework needs altering, do you need a professional plumber to fit for you?

For support with all your plumbing and heating needs, including radiator upgrades or replacements, contact the team at Lacey Plumbing.


Does a larger radiator make a difference?


A larger radiator can make a significant difference to heating efficiency and heat output. The increased surface area you gain from replacing a small radiator with a large one means it can distribute heat more effectively and evenly, with a lower internal water temperature.

This may even improve the efficiency of your condensing boiler, saving you energy and money in the long term. Equally, the lower flow temperatures larger radiators are able to operate at means you’re covered if you decide to use a heat pump in the future.

Before upgrading to a larger radiator, you should consider the size of your room, and decide whether you actually need to make this upgrade in terms of efficiency and effectiveness.

The process of replacing a radiator with a larger one

To replace a radiator with a larger one, you need to turn off your heating system, drain it fully and prepare your new radiator before installing and bleeding the larger replacement:

  • Measure new radiator - As well as the space in which you plan to fit it, measure your new radiator to ensure compatibility in the chosen room(s), and with surrounding pipework.
  • Turn heating off - Ensure you’ve turned the entire heating system off, and all radiators and pipes are cooled.
  • Isolate radiator - To stop water flow, you need to close the surrounding valves, isolating the radiator.
  • Bleed old radiator - To flush all water from the system, you need to open the bleed valve and catch all water in a bucket.
  • Remove old radiator - Using the correct tools, such as an adjustable wrench, disconnect all valves and pipes and remove the radiator from the wall brackets.
  • Prepare/install new radiator - Level and install new brackets if necessary. Then hang the larger radiator and connect/hand tighten to valves.
  • Open valves and bleed - Allow water back into the system, checking for leaks during this process. This also flushes out any trapped air in the system.

Remember, if you need to consider pipework alterations, or you’re at all uncomfortable with managing this process yourself, consult central heating experts.

The benefits of upgrading to a larger radiator

If done correctly, upgrading to a larger radiator comes with a number of benefits:

  • Improved heating efficiency
  • Faster heating
  • Energy savings
  • Increased comfort
  • Aesthetic benefits
  • Increased property value

Remember, you’ll only see these benefits if your larger radiators are installed properly by professionals, or somebody properly experienced with heating installations. Otherwise, you risk actually damaging your heating system and costing yourself money.


Book a Radiator Installation or Upgrade


Larger radiator options


  • Column radiators - 4, 5 and even 6 column models are great options for high heat output as well as their aesthetic value.
  • Double panel radiators - With two panels and either one or two sets of convection fins, double panel radiators are bigger and output more heat than single panel radiators. These are ideal for bigger rooms especially.
  • Cast iron radiators - Can take longer to heat up but are perfect for large rooms thanks to their size potential and eventual heat output.
  • Designer radiators - Usually chosen for their aesthetic benefits, many designer radiators come in larger sizes, covering bigger wall areas. Read our blog on how to bleed a designer radiator.

Remember, to avoid damaging your central heating system, costing you more money and time, consider calling the pros to replace your radiators with larger ones. 

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