Can you add another radiator to an existing system?

Author: Jefferey Gutkowski  |  Last update: Saturday, February 21, 2026

But suppose you don't have enough radiators to heat your house or they're too small to adequately warm the room they're in. In that case, you'll probably be considering installing a radiator to your existing system. Fitting a new model to your existing pipework can boost the temperature of a cool room.

Can you add more radiators to an existing system?

If you wish to add a new radiator to your central heating system, you'll need to make sure that your boiler is large enough to meet the extra demand placed on it. Boilers come in different sizes. This doesn't refer to their physical dimensions, but instead to their output in kilowatts.

Can you add a new radiator without draining the system?

If you're removing one or two radiators, it usually isn't necessary to drain the whole system. There's no harm in doing this, but you'll only be adding more work to the process. You will need to drain the radiator of excess water before removing it, though.

Can I join two radiators together?

However, when radiators go over a certain length they can be too heavy or unwieldy to move in one piece, so it is standard radiator industry practice to supply such long radiators in 2 blocks for joining on site. These would be supplied with a special joining tool designed for that specific radiator model.

Can you daisy chain radiators?

Radiators connected by way of a one-pipe system operate in accordance with the principle of a daisy chain. This means the return water of one radiator serves as the supply water of the next radiator unit.

HOW TO ADD A RADIATOR TO EXISTING HEATING SYSTEM Pt.1

Can you run one radiator off another?

Can you tee off an existing radiator? Yes! Once your new pipework is running from the radiator to the flow and return pipes, join them together.

Does a double radiator give more heat?

Double Radiators

The benefit of double configurations is that versus a single configured radiator in exactly the same size, it will emit a higher heat output. This means you can replace your single radiator with a smaller double radiator and still achieve the same BTUs - but take up less wall space.

How does a dual radiator work?

A dual fuel towel radiator is designed to operate using both the central heating system and electricity. This means that you have the flexibility to use it even when the central heating is turned off in the summer months, making it a versatile option for keeping your towels warm and dry throughout the year.

Can you connect radiators in series?

Installing Central Heating Radiators in Series

When you've made the decision to install new central heating radiators to either your commercial or residential premises, you have two options open to you. The first option is the one pipe system, which is often referred to as 'installing radiators in series'.

Can you change a single radiator to a double?

Yes, it is possible to replace a single-panel radiator with a double option, but the best way forward is to make sure the new double radiator has the same height and width dimensions as your existing radiator.

Does every radiator need a drain off valve?

If it's just the radiator you need to drain down, then there should be a drain off point to every radiator in the house.

What does a lockshield valve look like?

A lockshield valve is the valve on a radiator that is usually covered with a plastic cap. Lockshield valves need to be adjusted when balancing home radiators in individual rooms. A lockshield valve will help to balance out each radiator within your heating system, ensuring they all heat up at the same rate.

How do you cap off old radiator pipes?

To cap a radiator pipe, turn off the system and drain any remaining water. Clean the pipe end, apply thread seal tape clockwise, and securely attach a pipe cap or plug using pliers. Avoid over tightening. Test for leaks by turning on the system.

How much to add an extra radiator?

New Radiator Installation Cost

The cost of fitting an additional radiator will vary depending on who you hire. A small business or sole trader will cost around £150 to £200. A larger national company may charge £175 to £300.

Is installing a radiator a big job?

Replacing a radiator can take most of a day, but, with care and patience, it is is doable. In order to replace a radiator, you'll need to drain the old radiator, detach any the parts keeping it in place, remove it, install a new radiator, re-install any parts that were removed, and add coolant.

What happens if you have too many radiators?

If there are too many radiators on a system, they will work but they won't get hot enough.

Are two radiators better than one?

If you have a higher BTU requirement, it will often be better to use more than one radiator to heat a room. The total BTU you need for a room can be met by several smaller radiators or a few large radiators - it all depends on the layout of the room you want to heat.

Should a radiator be the same heat all over?

When they're working properly, radiators should be hot to the touch from top to bottom, left to right.

Can you mix radiator types?

Yes, it is possible to mix radiators that are constructed from different types of metal on the same system. Essentially, your central heating system or boiler will accommodate a mixture of materials over the course of its lifespan. As such, combining radiators made from different metals will pose no sort of issue.

Do double radiators use more gas?

A double radiator has marginally higher running costs compared to a single panel model . But are double panel radiators more efficient? Well with their ability to generate faster and bigger heat outputs, particularly in larger spaces, can actually make them a more energy efficient option.

How does a dual heating system work?

What is a Dual-Fuel System? A dual-fuel system is a home comfort system that pairs an electric heat pump with a gas furnace. As outdoor temperatures change, the system alternates between the two fuel sources, maximizing comfort and efficiency – offering the homeowner the key benefits of both fuel sources.

Is it worth upgrading to double radiator?

In terms of the space and size of your property, double panel radiators are extremely useful as they have double the space for hot water inside their tanks. If your property has airy spaces but large windows and little insulation, then a double convector radiator would be more efficient.

Can a car have 2 radiators?

You do not have 2 radiators. You have 1 radiator and 1 AC condensing unit. They look similar and this mistake is common. The radiator will have "tanks" where larger hoses will connect.

How can I increase the heat output of my radiator?

Regularly Clean Your Radiator

When dust gets accumulated, it creates a layer of insulation, in turn lowering the performance of your radiator. So, to enhance its efficiency, you've got to conduct routine clean-ups. Get rid of the dust using a vacuum and then wipe down the surface of the radiator.

Why are radiators under windows?

This is something most of us learn in school and it helps to explain why radiators are located underneath windows. As the hot air rises from the radiator, the cold air that is coming in through the window pushes against the warm air, circulating it around the room much more efficiently.

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