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 Valid for Updated Download File type
Brochure Specifying the right district heating substation makes commercial sense Romanian, Moldavian, Moldovan Romania 14 Jul, 2019 2.2 MB .pdf
Brochure Specifying the right district heating substation makes commercial sense Slovak Slovakia 14 Jul, 2019 2.4 MB .pdf
Brochure Specifying the right district heating substation makes commercial sense Slovenian Slovenia 14 Jul, 2019 5.2 MB .pdf
Brochure Specifying the right district heating substation makes commercial sense Bulgarian Bulgaria 14 Jul, 2019 11.3 MB .pdf
Brochure Specifying the right district heating substation makes commercial sense Croatian Croatia 14 Jul, 2019 2.5 MB .pdf
Brochure Specifying the right district heating substation makes commercial sense Ukrainian Ukraine 14 Jul, 2019 2.1 MB .pdf
Brochure Specifying the right district heating substation makes commercial sense German Multiple 14 Jul, 2019 10.7 MB .pdf
Brochure Specifying the right district heating substation makes commercial sense German Austria 14 Jul, 2019 2.0 MB .pdf
Brochure Specifying the right district heating substation makes commercial sense English Multiple 14 Jul, 2019 2.4 MB .pdf

Case studies

  • 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.

  • 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.

  • Domestic hot water for a new apartment building, Weitblick, Germany

    Under the German Drinking Water Ordinance, building owners and managers must ensure lasting prevention of Legionella in the domestic hot water systems used in residential buildings.

  • 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.

  • Domestic hot water for Selenium twins luxurious residential blocks, Istanbul, Turkey

    The Selenium Twins are two luxurious 34-storey residential blocks located in Fulya, Istanbul. They reside on a 29,000 m2 area of land owned by Besiktas JK football club that includes a 10-storey hospital building, 21-storey office building and 16,000 m2 supermarket.