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Danfoss

Domestic hot water systems with tank

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Water heaters with tank are suitable solutions for hospitals, sports arenas, hotels, apartment blocks and similar large buildings. The product range covers storage and charge systems which all combine the demand for high-performance, comfort, hygiene and resource-efficient operation. The systems can be combined with a second or multiple DHW storage tanks for optimum tailoring to on-site conditions, available with ready-to-mount piping.

How does a storage water heater work?

A storage water heater operates by releasing hot water from the top of the tank when the hot water tap is turned on. To replace that hot water, cold water enters the bottom of the tank, ensuring that the tank is always full. 

Our storage charging systems feature these two functions:

  • Storage Charging System - Due to the high-efficiency heating surface of the plate heat exchanger, the ThermoDual® systems obtain low return temperatures in the total operating sequence of a storage recharge, thereby resulting in reduced required volume flow rate. This means economical operation and makes the systems highly suited for application in district heating networks as well as in connection with condensing boilers.
  • Anti-legionella System - The Danfoss domestic hot water system ThermoClean® provides an additional effective solution for legionella-free domestic hot water production. ThermoClean® systems operate according to the principles of thermal disinfection, ensuring that the reaction temperature in the system is maintained at a constant temperature of 70°C. This provides effective protection against legionella bacteria in the domestic hot water system.

Features and benefits

  • Low return temperatures in the total operating sequence of a storage recharge, reduced required volume flow rate.

  • Highly suited for application in district heating networks as well as in connection with condensing boilers.

  • Special system with additional effective anti legionella function for domestic hot water production.

  • Electronic control gives you excellent operating economy.

Product range

Danfoss Legiomin domestic hot water station
Legiomin®

Find more technical information about Legiomin®. 

Danfoss MultiHeat domestic hot water station
Multiheat

Find more technical information about MH-Multiheat 2-Step storage charging system, brazed
ThermoDual CM, TD-S, LM-S and TD-GS

Find more technical information about ThermoDual® CM storage charging system, brazed or gasketed (TD-CM and TD-CMG); ThermoDual® CM circulation system, brazed (TD-CIRC); and ThermoDual® storage charging system with tank, brazed and gasketed (TD-S, LM-S, TD-GS).
ThermoClean® TC-C and TC-DL

Find more technical information about TC-C ThermoClean® combi antilegionella system, brazed and TC-DL and ThermoClean® DL antilegionella system, brazed .

 

Documents

Documents
Type Name Language Valid for Updated Download File type
Brochure Specifying the right district heating substation makes commercial sense English Multiple 09 Sep, 2025 4.4 MB .pdf
Brochure Specifying the right district heating substation makes commercial sense Romanian, Moldavian, Moldovan Romania 28 Aug, 2015 2.3 MB .pdf
Brochure Specifying the right district heating substation makes commercial sense German Multiple 15 Mar, 2020 3.1 MB .pdf
Brochure Specifying the right district heating substation makes commercial sense Slovenian Slovenia 20 Jul, 2015 5.2 MB .pdf
Brochure Specifying the right district heating substation makes commercial sense Bulgarian Bulgaria 30 Jul, 2015 11.3 MB .pdf
Brochure Specifying the right district heating substation makes commercial sense Croatian Croatia 05 Aug, 2015 2.5 MB .pdf
Brochure Specifying the right district heating substation makes commercial sense Slovak Slovakia 20 Jul, 2015 2.4 MB .pdf
Brochure Specifying the right district heating substation makes commercial sense Ukrainian Ukraine 17 Sep, 2015 2.2 MB .pdf

FAQ

What kind of information can I find in substation's instructions and manual guide?

Inside the instructions and manual guide you can find the following:

  • technical data for station (component list, Flow Chart, main data, HEX calculation e.g.)
  • safety notes
  • commissioning notes
  • service requirements
  • information’s about transport, hauling e.g.
  • certificates
  • contact persons
Where can I find substation's warranty? What are the conditions of payment?

These information are available for you in the sales contract (see order confirmation) and/or official price list.

What does it mean if the substation has a CE mark?

It means that substation fulfils all requirements for placement inside European market acc. related rules/directives e.g.

Case studies

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. 

Solar heating plant reduces CO2 emissions by 15,700 tonnes annually
Solar heating plant reduces CO2 emissions by 15,700 tonnes annually

The 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.
Flat stations in apartment building in Hamburg, Germany

Visitors to Hamburg’s Henriette-Herz-Ring who let their gaze drift upward will discover two shipping containers on the roof of the apartment building. They are the visible result of an innovative planning initiative to replace inefficient gas boilers with Danfoss flat stations. The highlight of this renovation: residents did not have to vacate their apartments.