Insulating your own radiators, pipes, boilers and combi boilers

Stop unnecessary heat loss with TONZON central heating foils


In most cases, it's easy to apply radiator foil yourself. Besides the radiators, you can also tackle the heating pipes and boiler or combi boiler. Read more about how to do it, below.


Radiator Foil

Stick the foil to the back of the radiator with double-sided tape or secure it to the back of the radiator with magnets. Download the radiator foil manual or watch the DIY video, alongside. Some cases may be a bit more complicated. Read more about this, below.

Column radiator

With column radiators, the radiator foil can also be applied directly to the radiator. Here, it is usually more convenient to attach the foil transversely, securing the left and right ends with double-sided tape or magnets. In general, the foil does not reflect and is therefore hardly noticeable. Alternatively, there is also a foil with one white side, which is even less noticeable. This sacrifices a little effectiveness, for a more aesthetic result. It can be applied in the same way. Watch the video alongside to see how to insulate a column radiator with de luxe radiator foil.

Radiator under a windowsill


In most cases it's not a problem if a radiator is difficult to reach due to being located under a windowsill. The foil can be stretched behind the radiator, for example by using a piece of string, and then attached to the ends. A windowsill can also prevent optimal air flow. You can improve this by using the foil as a kind of spoiler. See how to do this in the following video.


Mounting radiator foil on the wall


We always recommend attaching the foil to the radiator, but it can also be attached to the wall behind the radiator. In such case, it is best to use deluxe radiator foil. Cut the foil to size, preferably so that it protrudes slightly from behind the radiator, for the best effect. If you want to see as little of the foil as possible, cut it a bit shorter, at the expense of a little effectiveness. You can then glue the radiator foil directly to the wall, using our foil adhesive.


Insulating pipes

Insulating pipes is best done using traditional pipe insulation plus TONZON HR Lagging Foil. The traditional pipe insulation does not need to encircle the pipe completely. Any gap will be sealed later by the lagging foil. Simply slide the pipe insulation onto the pipes. Then use the Lagging foil to make the pipes reflective. There are two ways to do this.

The first option is to wrap the foil around the pipes. The broadest lagging foil is best suited for this, as it requires fewer windings. Narrower lagging foil is slightly easier to apply if there are many bends and jucntions.

See how to use lagging foil in the video alongside.

Applying lagging foil lengthwise


The second option is to place lagging foil lengthwise, along the pipe, and stick the pieces together using double-sided tape. The following table shows lagging foil thickness by pipe size:


Pipe diameter Insulated pipe diameter Lagging foil thickness 12 mm 22 mm 12.5 cm 15 mm 25 mm 12.5 cm 22 mm 32 mm 15 cm 28 mm 38 mm 15 cm 35 mm 45 mm 20 cm


Combi boilers and boilers


It’s easy to insulate a boiler or combi boiler. Hang the TONZON foil around the boiler and secure it with super magnets or magnetic tape. With these fastening methods, the foil can also be easily removed from the boiler for maintenance work. After which it can be simply replaced.


Experience the benefits of radiator foil


or call +31 (0)53 - 480 3226