Radiator Types Compared: Find the Right One

The right radiator can mean the difference between high energy bills and a comfortably warm home. Here are the most common types, their benefits and where they work best.

What types of radiators are there?

Radiators vary in design, material and how they transfer heat. Your choice affects efficiency, how quickly a room warms up and indoor comfort.

Panel radiators: An efficient standard choice

Panel radiators have one or more steel panels that emit radiant heat. Convector fins between the panels boost heat output by circulating warm air.

Type 11 has one panel and no convector fins. Type 22 has two panels with convector fins between them. Type 33 has three panels and delivers the highest output in the least space.

Column radiators: Durable and affordable

Made from cast iron or steel, column radiators have distinctive visible sections. They hold heat for a long time and release it gradually.

They are durable and long-lasting, but heavier and slower to respond to thermostat changes. They are a good fit for rooms used occasionally or for use alongside a wood-burning stove.

Designer radiators: Style meets function

Designer radiators put appearance first. Options include slim vertical models, glass panels and sculptural metal designs. Maximum heat output may not be the main priority.

Use a designer radiator as a focal point in a well-insulated living space. Pair it with high-output standard radiators in other rooms for more even heat throughout your home.

How do I choose the right radiator?

The right radiator depends on the room size, how you use the space and your heating system. A radiator that is too small will not keep the room warm enough; one that is too large can waste energy.

How to calculate the heat output you need

As a rough guide, allow 80 to 100 watts per square metre of floor space in an insulated older home. A well-insulated new home often needs just 50 watts per square metre.

Multiply the room's floor area in m² by the wattage. A 15 m² room in an older home needs approximately 15 x 100 = 1500 watts of heat output. Choose a radiator rated to provide that output.

Choose the right material for each room

Steel is lightweight, heats up quickly and suits most living spaces. Cast iron is heavy, warms up slowly and works well in rooms that need steady heat. Aluminium is very lightweight and heats up extremely quickly.

In the bathroom, a specialist bathroom radiator or towel radiator such as the

Silver heated towel rail with 6 bars

View product

“Modern panel radiators combine radiant heat and convection to create a comfortable indoor climate. They do not dry out the air, and they stir up less dust.”

Why should I replace an old radiator?

Older radiators are often inefficient and can use up to 30 percent more energy. Replacing one can noticeably lower your heating bills.

How to spot outdated technology

If a radiator is warm only at the top, it may be clogged with scale or sludge. Heavy corrosion around the connections or leaking valves are clear warning signs.

Column radiators from the 1970s can be very inefficient. Replacing one with a modern panel radiator can often pay for itself within a few years through energy savings.

What does replacing a radiator involve?

First, the heating system is drained and the old radiator is removed. New connections and valves are installed. After the new radiator is fitted, the system is refilled and bled.

Use a reliable radiator air vent such as the

Automatic radiator air vent 1/2, 2 pieces

View product

LTR-5CSRE thermostat for heating or cooling

View product

How can I save energy with the right heating system?

Saving energy starts with the right technology and continues with how you use it. The biggest savings come from combining both.

Use smart thermostats

Programmable thermostats automatically lower the temperature while you’re asleep or away from home. Smart models learn your habits and continually optimize your heating schedule.

They not only control the temperature but also show your energy use, helping you spot energy wasters in your home. App control adds extra convenience.

Balance your heating system

During hydronic balancing, an HVAC professional adjusts your heating system so each radiator gets exactly the amount of water it needs. This prevents flow noises and helps heat every room evenly.

It’s one of the most effective ways to save energy. It lowers the return temperature and reduces the workload on the heating circulation pump. It may also qualify for government incentives.

“Many homeowners underestimate the impact of hydronic balancing. It’s like tuning a car’s engine. Only when all the components work together can you drive efficiently and comfortably.”

Improve your heating habits

Lower the room temperature by 3 to 5 degrees at night and when you’re away. Every degree lower saves around 6 percent on heating energy. Don’t heat your home with the windows left open.

It’s more efficient to air out rooms by opening the windows fully for 5 to 10 minutes. Don’t place furniture directly in front of radiators or cover them with long curtains. This also applies to radiators in a garden shed or sunroom.

Underfloor heating vs. radiators: which is better?

Underfloor heating distributes warmth evenly throughout a room. It operates at low water temperatures, making it ideal for heat pumps. Radiators respond more quickly to temperature changes.

Advantages of underfloor heating

It provides comfortable, even warmth and keeps your feet warm. It stirs up very little dust, which allergy sufferers may appreciate. You can arrange furniture freely because there are no radiators taking up wall space.

The downsides are the high installation costs in existing homes and its slow response time. Adjusting the temperature can take several hours.

Advantages of traditional radiators

Radiators cost less to buy and install in an existing home. They respond to thermostat settings within minutes. A bathroom radiator can also double as a towel warmer.

For many garden sheds or workshops, installing radiators is the simpler solution. Be sure to choose frost-resistant models.

Practical tips for installation and maintenance

Regular maintenance can extend the life of your heating system. You can handle some tasks yourself, while others require a professional.

Bleed radiators regularly

Gurgling noises and radiators that are cold at the top can indicate air in the system. Bleed all radiators at the start of the heating season. Use a suitable tool from our hand tools category.

This makes bleeding radiators especially easy. After bleeding, check the system pressure at the boiler and add water if needed.

Set thermostat valves correctly

The numbers on the thermostat dial correspond approximately to these temperatures: Setting 3 = 20°C, Setting 4 = 24°C. Avoid constantly adjusting the valves. Instead, choose a comfortable setting and let the thermostat do its job.

Thermostats with a frost protection setting are suitable for rooms you use only occasionally. They help keep pipes from freezing without fully heating the room.

With the right radiators and proper care, you can make your home more comfortable and keep heating costs under control. Modern technology and mindful heating habits are key.

Frequently asked questions

Which radiator is the most energy efficient?

Panel radiators with convector fins (Type 22/33) are considered especially efficient because they give off heat through both radiation and convection. Their efficiency depends largely on choosing the right size for the room and pairing them with programmable thermostats. Hydronic balancing further helps optimize energy use.

When should I replace my radiators?

Replace radiators if they still don’t heat properly after bleeding, are badly corroded, or have leaks. Replacement may also make sense when you upgrade your heating system, such as switching from oil to gas or a heat pump. New models can be significantly more energy efficient and help lower heating costs.

Can I bleed radiators myself?

Yes. Bleeding radiators is easy to do yourself with a suitable radiator key or a special radiator bleeder such as PRODUCT_72819. Turn up the heat, hold a container under the valve, and open it slightly until only water comes out. Close the valve firmly right away.

What are the benefits of a smart thermostat?

Smart thermostats such as PRODUCT_9473 learn your habits and automatically adjust heating schedules. You can control the heat with an app while you’re away from home and monitor energy use. That way, you only heat when needed and can save up to 10 percent on heating costs. The investment often pays for itself within a few heating seasons.

Can I use a bathroom radiator to dry towels?

Yes. Towel radiators such as PRODUCT_115377 combine room heating with a handy rail for hanging and drying towels. Make sure the heating output (Watt) is sufficient for your bathroom’s size. Electric models can also be used in summer just for drying towels, without heating the room.