Indirect heating systems

  • Overview
  • Product range
  • Documents
  • Tools and apps
  • Case stories

An indirect substation is used when district heating network conditions, such as pressure and temperature, do not allow direct connection. When a substation is connected indirectly, a heat exchanger provides energy-efficient heat transfer. It also ensures that the primary network supply side and the secondary building installation side remain safely separated. 

In this way, the building application works regardless of pressure or temperature variations in the district heating network (hydronic balancing) and is safe from pipe breaks or leaks.

Danfoss indirect substations are self-contained units that are generally wall-mounted. They can support single or multiple heating circuits, with or without domestic hot water production on the primary or secondary side.

These advanced solutions are also available with an electronic controller for weather compensation. This ensures easy and energy-efficient operation while simultaneously allowing central monitoring and energy consumption transparency.

Features and benefits

Advanced solutions available also with an electronic controller for weather compensation

Indirect substations with Micro Plate™ heat exchangers provide energy efficient heat transfer

Smaller, lighter, more efficient: Danfoss' compact substation DSA1 Mini

Learn how the station is installed, as well as tips and tricks for commissioning and maintenance.

Product range

  • if (isSmallPicture) { DSP MOD@ substation; } else if (isBigColumns) { DSP MOD@ substation } else { DSP MOD@ substation }
    DSP MOD@ substation

    DSP stands for ‘Danfoss Substation Prefabricated’, highlighting the fact that you get a substation that is easy to install and that complies with 90% of the typical district heating network technical connection requirements. MOD@ stands for ‘modular and digital’, meaning you get a substation that’s flexible, easy to configure and works seamlessly with our digital district heating network product portfolio.

  • if (isSmallPicture) { ; } else if (isBigColumns) { } else { }
    Indirect or direct heating and domestic hot water cylinder

    Substations for indirect heating have a heat exchanger separating the primary flow from the secondary flow. Indirect substations are recommended for PN16 networks and higher pressure classes. Substations for direct heating have no heat exchanger separating the primary flow from the secondary flow and are recommended for maximum PN10 or PN6 networks. The domestic hot water is heated in a cylinder by the district heating water flow in a coil within the cylinder.

  • if (isSmallPicture) { ; } else if (isBigColumns) { } else { }
    DSP - Danfoss Station Pre-engineered

    Find more technical information about DSP - Danfoss Station Pre-engineered.

  • if (isSmallPicture) { ; } else if (isBigColumns) { } else { }
    Indirect heating

    A substation for indirect heating has a heat exchanger separating the primary flow from the secondary flow. Indirect substations are recommended for PN16-networks and higher pressure classes. Substations in this category are normally supplied with connection pipes for a domestic hot water cylinder on the primary side for the fitted constructions, and on the secondary side for the welded constructions.

  • if (isSmallPicture) { ; } else if (isBigColumns) { } else { }
    Indirect heating and domestic hot water

    A substation for indirect heating has a heat exchanger separating the primary flow from the secondary flow. Indirect substations are recommended for PN16-networks and higher pressure classes.

Documents

Documents
Type Name Language Valid for Updated Download File type
Operating guide District heating substations English Multiple 19 Feb, 2020 3.2 MB .pdf
Brochure Specifying the right district heating substation makes commercial sense English Multiple 05 Mar, 2015 2.4 MB .pdf

Tools and apps

Case stories

  • if (isSmallPicture) { Eurasburg; } else if (isBigColumns) { Eurasburg } else { Eurasburg }
    Successful transition from oil boilers to a local heating network in Eurasburg

    In the Wittelsbacher Land near Augsburg the local network in Eurasburg supplies heat to 80 buildings using a wood chip heating system. Danfoss’ substations ensure efficient heating in all building types, and its modern SCADA solution enables remote system monitoring and management. 

  • if (isSmallPicture) { Rothes CoRDe plant; } else if (isBigColumns) { Rothes CoRDe plant } else { Rothes CoRDe plant }
    DrivePro® Lifecycle Services secure maximum uptime for Rothes CoRDe

    SCOTLAND: The Rothes CoRDe plant, a biomass-fired combined heat and power (CHP) plant, ensured maximum uptime thanks to several DrivePro® Lifecycle Services.

  • if (isSmallPicture) { Pipe tracing in 600 Suzhou apartments China; } else if (isBigColumns) { Pipe tracing in 600 Suzhou apartments China } else { Pipe tracing in 600 Suzhou apartments China }
    Pipe tracing in 600 Suzhou apartments China

    Suzhou city was founded in 500 BC. is nowadays a major city located in the south-eastern Jiangsu Province of East China, about 100 km (62 mi) northwest of Shanghai. It is a big economic center and local point of trade and commerce, and the second largest city in the province, after its capital Nanjing.

  • if (isSmallPicture) { Saleska valley, Slovenia; } else if (isBigColumns) { Saleska valley, Slovenia } else { Saleska valley, Slovenia }
    Improved hydronic balancing of the district heating network in Slovenia

    The Saleska Valley district heating network is the second largest network in Slovenia, dating back to 1959. Since then, the demands have changed significantly and have challenged the hydronic balancing of the system which was optimized with new intelligent controllers Virtus.

  • if (isSmallPicture) { In Helsinki a total of 667 addresses in a mix of large and small buildings and apartments have had the Leanheat software installed.; } else if (isBigColumns) { In Helsinki a total of 667 addresses in a mix of large and small buildings and apartments have had the Leanheat software installed. } else { In Helsinki a total of 667 addresses in a mix of large and small buildings and apartments have had the Leanheat software installed. }
    Leanheat makes buildings smart

    In Europe, 30 percent of all energy consumption goes to heat or cool buildings. Danfoss has the solution to lower energy usage and improve indoor climate by adding a digital element: Leanheat software.

  • if (isSmallPicture) { Consumption with SONDEX evaporators; } else if (isBigColumns) { Consumption with SONDEX evaporators } else { Consumption with SONDEX evaporators }
    SONDEX® raises the standard in Brazil

    Since its launch in 2016, the SONDEX® branch of Danfoss Brasil has worked hard to become the leading manufacturer of plate heat exchangers for customers across Latin America. In December 2017, the company took giant strides towards fulfilling its high ambitions when it delivered four evaporators to Bioenergética Aroeira for use in the production of sugarcane ethanol – the biggest delivery of its kind ever manufactured in Latin America.