How Much Bigger Do Heat Pump Radiators Need To Be?

When it comes to the sizing of a heat pump radiator, there are a lot of factors to consider. In this blog post, we'll take a look at some of the key things you need to think about when deciding on the radiator size you're going to connect to the heat pump installation.

We'll also provide some tips on how to ensure that you get the right size for your needs. So, read on to find out more!


Do I Need a Specific Radiator with a Heat Pump?

Most radiators are designed to be compatible with modern heat pump systems. However, you may need to check which heat emitter your radiator has, to ensure full compatibility.

You can find out more information on how heat pumps and radiators work together here.

Heat pump systems operate between 35o ‑and 45o inputs, whereas traditional radiators are designed to work with gas boiler systems which operate at a 75o input. This means that a heat pump radiator of the same size as a traditional one, can’t generate the same levels of output. But it is significantly more efficient.

For this reason, to achieve the same heat output you would need much larger radiators or source low-water-content radiators. Sovereign Radiators use a lamella heat exchanger which is low water content making them ideal for heat pumps.


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How To Size A Heat Pump Radiator

When sizing radiators for a heat pump system, it's important to remember that the radiators will need to be bigger than those used for a traditional heating system. This is because heat pumps operate more efficiently so the water temperature remains lower.

To ensure your new heat pump system is effective, make sure you choose radiators that are appropriately sized for the room you are installing it in.

Radiator size is typically measured in square feet, and the size of the heat pump will need to be increased if the space to be heated or cooled is larger. In addition, the radiator size will also need to be increased if the heat pump is being used to heat or cool a larger space than the one for which it was originally designed.

To calculate the required radiator size for a heat pump, as a guideline you will typically need a radiator that is 2.5x larger than a traditional radiator. The best radiators for heat pumps are those that are made of materials that have high thermal conductivity, such as Zintec Steel. This will help to transfer heat more efficiently from the heat pump to the air in the room, making it easier to maintain a comfortable temperature.

Another solution to maintaining high heat outputs whilst using a radiator that is connected to a heat pump is to use a fan-assisted model. The benefit of using a fan-assisted radiator is that the radiator you specify doesn’t need to be as big. Using a fan-assisted radiator, on average, produces 3x as much heat output as one without a fan. This means the combination of a heat pump and a fan-assisted radiator will roughly bring your radiator size back to what it would be using a traditional model. But it will heat the room using a lot less water; which is both energy efficient and economically friendly.




Low Surface Temperature Radiators with Heat Pumps

Installing a low surface temperature (LST) radiator, such as one from the Sovereign range, is particularly suitable in spaces occupied by members of the public. In such surroundings, a low surface temperature is necessary to safeguard effective heat output whilst providing safety to those using the space. These areas include commercial buildings and offices, hospitality venues and medical settings.

Using a heat pump as part of this system ensures a low surface temperature. Heat pumps use a minimal amount of water and don’t heat the water as hot as traditional systems. Users also benefit from straightforward controls and fast heating which improves thermal comfort.

This means if you require an LST radiator for your project and it uses a heat pump you may not need as big an increase in radiator size as you might have originally thought.


Need Help Sizing Radiators For Heat Pumps?

So now you know why radiator size is important when using a heat pump. If you have any questions about sizing your radiator or need help calculating the right size for your project, our team of experts can help.

We’ll work with you to find the perfect-sized radiator for your needs and ensure that your heat pump is working effectively. Don’t wait – contact us today to get started.


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About Us

Contour produces a range of innovative, safe surface temperature systems for healthcare, education, mental health, commercial and secure sectors, working in close partnership and collaborating with architects, M&E engineers, NHS Trusts, local authorities, design consultants and contractors to deliver outstanding safe heating solutions.

Contour is the exclusive partner of BioCote® anti-microbial technology for LST and anti-ligature radiators.  BioCote® additives reduce bacteria by up to 99.9%. Contour combines an extensive range of colour-paints is with BioCote® for a durable, high-quality finish.

Contour’s heating solutions offer secure, single-person quick access to radiator guard interiors for regular deep cleaning and maintenance.  Each year, Contour save the NHS millions of pounds in cleaning costs, therefore delivering cleaner, safer environments.  Contour is redefining the marketplace and therefore many regards us as a design and innovation leader within the industry.

Contour has a quality-first philosophy. Our customer-focused team possess a ‘can-do’ attitude, they take pride in developing solutions for your heating requirements.

Contact us at:

The Mansions, 43 Broadway Shifnal

Shropshire TF11 8BB United Kingdom

+44 1952 290 498

Twitter: @Contour_Heating

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