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New modular water-to-water heat pump design increases system flexibility and performance

Daikin Applied UK has released a new range of water to water heat pumps based on its existing EW*T-Q-X-A1 range. Available from April 2024, the new EW*T-Q-X-A1 features a new modular approach to system design, which introduces additional flexibility in configuration.


Breaking away from the more traditional ‘package’ solution, the modular approach allows the required capacity to be reached by combining smaller units piped together and controlled as a single one. Modular construction offers significant benefits in siting and installation, making units easier to transport, handle and position up to a fully plug & play solution by including the Daikin Manifold Kit and Pump module.

Application flexibility

The new water sourced EW*T-Q-X-A1 heat pumps can ensure heating or cooling operation under many different conditions. Hot water can be produced up to +60°C; whilst chilled water is supplied in the range from -15°C (water-glycol mixture) to +30 °C evaporator leaving water temperature.

Hence, the range of applications that can be covered is wide and including comfort heating, space and process cooling, heat recovery.

Composed of three base modules offering 100, 125 and 160kW capacities, the range features scroll compressors and is available in two sound versions including a reduced sound variant which is suitable for outdoor installation and noise sensitive applications as condominiums, hotels and hospitals.

Unit configurations by type include:

  • Water to water heat pump with inversion on water side
  • Water to water heat pump with inversion on refrigerant side (100 kW only)
  • Condenser-less.

The benefits of modularity


Thanks to its modularity, the new EW*T-Q-X-A1 offers the potential for scalability, reducing initial investment costs while opening up the possibility for future expansion with additional modules installed as building occupancy increases. The introduction of a common scroll layout ensures greater compatibility, helping to promote system longevity and making future system upgrades effortless. The modules can be combined as a side-by-side array or stacked to minimise space requirements, especially useful for retrofit applications.


Each of the different module is very compact and can be easily transported and positioned on to the installation space. Being the single module 120 centimetres wide, 130 cm depth and 100 cm height, it can be easily handled with a forklift, without the need of a crane to move an entire package chiller.

Plug  & play installation

Installation can be further simplified by employing the Daikin Manifold Kit, designed to connect modules on water side, as it includes the piping between the units. As well, each manifold is equipped as standard with manual isolation valves for all connections. This allows to exclude each single module from the circuit in case of maintenance without the need to stop the entire system.

Moreover, a dedicated Pump Module can be easily added to the array of modules. It is equipped with inverter pumps for full flexibility, and includes an expansion tank of 18 litres volume.

Lower operating costs

Thanks to its modular design, the new EW*T-Q-X-A1 can closely follow the cooling and heating load profile of the building. This is particularly relevant, as it ensures low operating costs of the HVAC plant at part load conditions, which represent most of the working time. The same is not true for traditional package chillers, as in part load conditions the package chiller cannot deliver the required load according to EN14825. This means that chiller would have to perform a series of on-off cycles introducing inefficiency in the operation.

Delivering energy performance with limited environmental impact

Daikin is committed to continuous design improvement aimed at reducing the environment impact of its cooling, heating and refrigeration solutions. Daikin BLUEVOLUTION chillers use R-32 refrigerant which has a Global Warming Potential (GWP) of 675, just one third of R-410A. This, in conjunction with high-energy efficiency, has the potential to reduce a building’s carbon footprint substantially. The reduction in required refrigerant charge enabled by the use of R-32 offers further efficiencies while reducing installation and service costs.



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