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
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }Indirect heatingA 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.
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }Indirect heating and domestic hot waterA 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.
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }Indirect or direct heating and domestic hot water cylinderSubstations 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.
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }DSA - Danfoss Station Advanced CompactFind more technical information about DSA - Danfoss Station Advanced Compact.
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }DSP - Danfoss Station Pre-engineeredFind more technical information about DSP - Danfoss Station Pre-engineered.
Documents
Tools and apps
Case stories
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }Pipe tracing in 600 Suzhou apartments ChinaSuzhou 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.
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }Improved hydronic balancing of the district heating network in SloveniaThe 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.
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }Leanheat makes buildings smartIn 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.
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }SONDEX® raises the standard in BrazilSince 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.
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }Solar heating plant reduces CO2 emissions by 15,700 tonnes annuallyThe world’s largest solar heating plant in Silkeborg, Denmark harnesses energy to heat the homes and workplaces of 40,000 citizens. It supplies 18-20% of the annual heat consumption in the city of Silkeborg, Denmark, which has an ambitious target of CO2 neutrality in heat production by the year 2030.
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }Danfoss ensured the right pool temperature at the right timeIn December 2017, the European Swimming Championships took place in the brand-new Royal Arena in Copenhagen. The arena normally hosts major names from the international music scene but for five days of competition, it was transformed into an international swim stadium.