Domestic Hot Water systems require a special approach to hydronic balancing. As any other heating system, the water should be equally distributed. But because the water is also consumed, safety matters too. It is important to control the water temperature. It should be high enough to use and avoid growth of legionella bacteria, but not so high that it causes personal injuries. At the same time, the energy efficiency of the DHW system needs to be optimized.
For these reasons, manual or automatic balancing valves are not applicable. Thermal balancing valves, controlling the water temperature in every riser of the system, are the best option for these types of systems. By maintaining a constant water temperature in every riser, the DHW system is automatically balanced, no matter the distance to the DHW source.
For extra safety, DHW systems can periodically be disinfected by temporarily increasing the water temperature to a level that kills legionella bacteria.
Danfoss offers a broad range of thermal balancing valves, disinfection solutions and related products for Domestic Hot Water systems.
Features and benefits
Thermal balancing ensures hot water to be available equally fast at the same temperatures, no matter how far from the source
Heat losses are minimized, and the circulation pump only distributes the required amount of water to minimize the energy consumption of the system
Reduce water waste
Hot water is always available and reduces long waiting times
Reduce the risk of legionella
Insufficient heated risers that allow legionella to grow are prevented but the functional design of the system remains just as important
MTCV Thermal balancing valves provide a dynamic, temperature based, balancing solution for drinking water applications. The valves prevent too high temperatures causing lime, corrosion and high energy costs. They also prevent too low temperatures where legionella risks increase and long waiting times for hot water to occur.
Domestic hot water systems with tank
The 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.
Instantaneous water heaters without tank
The instantaneous water heaters are suitable for smaller households, as they provide hot water when you need it - you get instant hot water. Compared to storage water heaters they do not generate standby energy losses and can therefore save you money.
District heating compact stations in Mikado House, Orestaden, Denmark
Application: Production of heating and domestic hot water
Challenge: Design and construct a customized compact district heating station
Solution: Danfoss designed and constructed a pre-assembled station according needs and helped save 14 days of construction work
District energy as the heating and cooling solution in Teknopark Istanbul, Turkey
Application: Production of heating, cooling and domestic hot water
Challenge: Design and construct customized district energy solutions for all buildings on the park
Solution: Danfoss designed and constructed 3 pre-assembled DSE substations containing control valves for the heating, cooling and domestic hot water, heat meters, self-acting controllers and electronic controllers connected to a central Building Management System.
Modernized district heating in a hospital, Belgrade, Serbia
Application: Heating + Domestic Hot Water production by district heating substations
Challenge: Modernize old and inefficient heat and hot water system
Solution: 58 fully equipped prefabricated substations
HVAC control at Katowice business centre, Poland
Katowice Business Centre is a modern office building where Danfoss hydronic balancing solutions are used; AB-QM balancing and control valves in combination with revolutionary NovoCon® actuators.
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.