The Örebro Castle

DEVI electrical heating systems for the conservation of old castles

The Örebro Castle is a medieval castle fortification situated in the scenic region of Närke, Sweden. The castle lies on an island by the river Svartån. The oldest part of the castle, a defense tower, was erected in the latter half of the 13th century, but its present appearance, the Örebro Castle, was constructed over the last century. Since 1935, the castle has been a national Swedish monument.

Many important events in Swedish history have taken place in the Örebro Castle. Nowadays, it is open to the general public and you can take a guided tour to feel the monumental history hidden within its walls. It appears that those walls also hide solutions tailored for the 21st century.

Complete roof renovation

In 2012, the castle underwent a complete roof renovation; a new copper plate and new gutters were installed. In order to increase safety and prevent damage to the castle in the winter, since the frost damages roof gutters and brickwork, it was decided to install an electrical heating outdoor system in Örebro Castle, to take care of the problems before they arise.

The biggest challenge for the system was, not only to provide security and safety in an environmentally-balanced way, but also not to damage the national Swedish monument. This sensitive project was conducted in 3 stages, and was finished in 2014.

Why do old castles need DEVI solutions?

Winter can be a dangerous, troublesome, and expensive occurrence for every house owner. Can you imagine how difficult it can be for a castle owner in Nordic Sweden?

Snow can accumulate on the castle rooftop. On sunny winter days, snow begins to melt due to solar heat. Melted snow trickles down and can settle along colder valleys, overhangs, and inside gutters.

On freezing winter nights, when temperatures fall below 0⁰C again, melted snow refreezes, forming dams of ice, which can damage the roof and pipes.

In order to avoid this kind of expensive destruction, the Örebro Castle was equipped with nearly 1,000 meters of DEVIiceguard ™ heating cable.

What was done on Örebro Castle?

The DEVI installation in the Örebro Castle was a huge challenge, especially for Elprofilen AB – the DEVI partner and cardinal constructor of the castle renovation. According to national monument status, highly specialized installers, Elprofilen AB, not only had to take special care of each part of their work, they also had to act in accordance with legal regulations, e.g., drilling was forbidden.

The entire project was extremely sensitive and tricky. The biggest challenge was a scaffolding construction. Climbing workers were engaged in order to help. For the Örebro Castle renovation project, the heating cable DEVIiceguard™, DEVI Easy Connect and control system, and DEVIreg™ 850 with humidity and temperature sensors were chosen.

The project succeeded. Actually, even the White Lady from the Örebro Castle feels more comfortable and safer – ask her when you visit the castle during your holidays.

Project Overview:

  • DEVIiceguard™ 1,000 m
  • DEVI Easy Connect
  • DEVIreg™ 850
Prosjektets størrelse


De typiske anvendelsesområder for selvbegrænsende varmekabler type Devi-Iceguard™ er: Frostsikring af tagrender, skotrender og nedløb. The DEVIiceguard™ is a self-limiting parallel heating cable that is used for ice and snow melting on roofs and in gutters and downpipes. The self-limiting capability of the cable ensures that the output of the cable increase or decrease according to ambient temperature. The heating cable is flexible and easy to install as it can be cut to length at site and installed directly on to the roof and gutter system.
Elektronisk detektor for sne- og issmeltningsanlæg beregnet for DIN-skinne montage. Anvendes til styring af sne- og issmeltningsanlæg i veje, indkørelse, ramper, trapper, tage o.lign. The DEVIreg™ 850 is an advanced thermostat with LED display used for outdoor ground or roof applications. The sensors provide information about both moisture level and temperature, resulting in an optimal control of the heating system. The system can be set up in three ways; as a single system for roof or ground (1 to 4 sensors), as a dual system for roof or ground (2 - 4 sensors) or as a combination system for roof and ground (2 - 4 sensors). In the dual / combination systems it is possible to prioritize between the zones, e.g. if only a limited power output is available.