Instantaneous water heaters provide hot water instantaneously and only as it is needed. When you turn on a hot water tap in your home, cold water travels through a pipe into a heat exchanger in the unit.

The cold water is heated in the heat exchanger via district heating water or another waterborne heat source. As a result, the water heaters deliver a constant supply of instant hot water.

The biggest advantage of a water heater with heat exchanger is: It never goes empty! Danfoss instantaneous water heaters can supply from one up to four households with domestic hot water and are very suitable for one-family houses.

Installation and maintenance

Proper installation and maintenance of your water heater can optimize its energy efficiency. Proper installation depends on many factors. Therefore, it is best to have a qualified plumbing and heating contractor install your water heater for you.

It is necessary to check and maintain the water heater on a regular basis in order to keep it in good operating condition. The frequency of the maintenance and service inspections should be according to system manufacturer specifications and local legislation. Most instantaneous and tankless hot water heaters have a life expectancy of more than 20 years. They also have easily replaceable parts that extend their life by many more years.

Periodic water heater maintenance can significantly extend your water heater's life and minimize loss of efficiency. Read the instructions that come with the water heater for our specific maintenance recommendations.

Features and benefits

Easy to install, requires little space and is simple to operate. 

Low operational temperatures.

Provides very clean water since there is no stagnant water in heat exchangers where slime and bacteria can grow.

Product range

  • ThermoDual® TD-FLS

    Find more technical information about ThermoDual® TD-FLS combi instantaneous domestic hot water heater.

Documents

Type Name Language Updated Download File type
Data sheet - AI Complete W37 German 24 Aug, 2018 722.3 KB .pdf
Data sheet - AI Complete W45 German 24 Aug, 2018 800.1 KB .pdf
Data sheet - AI Complete W55 German 24 Aug, 2018 790.4 KB .pdf
Data sheet - AI Make Up Croatian 27 Oct, 2018 1.0 MB .pdf
Brochure - AD Specifying the right district heating substation makes commercial sense German 27 Oct, 2018 10.7 MB .pdf
Brochure - AD Specifying the right district heating substation makes commercial sense German 27 Oct, 2018 2.0 MB .pdf
Brochure - AD Specifying the right district heating substation makes commercial sense English 27 Oct, 2018 2.4 MB .pdf
Brochure - AD Specifying the right district heating substation makes commercial sense Slovak 27 Oct, 2018 2.4 MB .pdf
Brochure - AD Specifying the right district heating substation makes commercial sense Slovenian 27 Oct, 2018 5.2 MB .pdf
Brochure - AD Specifying the right district heating substation makes commercial sense Bulgarian 27 Oct, 2018 11.3 MB .pdf
Brochure - AD Specifying the right district heating substation makes commercial sense Croatian 27 Oct, 2018 2.5 MB .pdf
Brochure - AD Specifying the right district heating substation makes commercial sense Romanian, Moldavian, Moldovan 27 Oct, 2018 2.2 MB .pdf
Brochure - AD Specifying the right district heating substation makes commercial sense Ukrainian 27 Oct, 2018 2.1 MB .pdf
Data sheet - AI ThermoDual FLS English 24 Aug, 2018 574.1 KB .pdf
Data sheet - AI ThermoDual FLS German 24 Aug, 2018 623.0 KB .pdf
Data sheet - AI ThermoDual FLS Italian 24 Aug, 2018 581.9 KB .pdf
Data sheet - AI ThermoDual FLS Threaded German 24 Aug, 2018 765.6 KB .pdf
Data sheet - AI ThermoDual FLS-COMBI MFWC-version German 24 Aug, 2018 703.4 KB .pdf
Data sheet - AI ThermoDual-FLS-COMBI English 13 Nov, 2018 943.0 KB .pdf
Data sheet - AI ThermoDual-FLS-COMBI German 13 Nov, 2018 991.4 KB .pdf

Case studies

  • 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.

  • Renovation of an apartment building with flat stations, Hamburg, Germany

    Until 2014, the apartments in this multi-family building located in the Hamburg suburb of Bergedorf were heated using electrical water heaters and supplied with domestic hot water using electrical instantaneous water heaters. Now, after the renovation, a block heating station in the basement of the building provides heating distributed via flat stations installed in the stairwell and used for decentralized domestic hot water. Tenants were able to stay in their apartments throughout the renovation process.

  • 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.