Reverse Osmosis
1 model in this family. Representative models: APP 0.6 - 1.0.
International brand dossier
Danfoss Pumps
Danfoss is a Danish engineering group with strong positions in VLT drives and high-pressure pump technology.In water treatment, Danfoss records are relevant both for variable-speed motor control and for APP high-pressure pumps and energy-related components used in RO, desalination, deionized water, humidification, and water-reuse systems.
Danfoss Pumps's position in pumps and pumping equipment is defined by product families such as Reverse Osmosis, Ultra Pure Water, Tap Water and Fire pumps / Tap Water.The portfolio is best understood inside raw water intake, RO/NF feed, transfer, boosting, chemical dosing, wastewater lift, and desalination hydraulics, where engineers compare the technology route, family boundaries, and duty fit before narrowing to individual models.
Representative series on this page include APP 0.6 - 1.0, PAHT 2 - 12.5 and PAH 2 - 12.5.Selection should focus on flow, head, efficiency, NPSH margin, wetted materials, seals, and drive arrangement.
6
Indexed models
5
Product families
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Subgroups
Product range and selection
How to choose Danfoss Pumps & Pumping
This section answers two questions: which main product families Danfoss offers, and which parameters to compare before choosing a specific model.
Step 1: Choose a product family by application
The main families shown on this page are Reverse Osmosis, Ultra Pure Water, Tap Water, and Fire pumps / Tap Water. Start with the treatment objective, equipment format, and operating duty, then use the model index below to compare exact specifications.
Step 2: Confirm the model by key parameters
After choosing a product family, compare flow and head, materials, efficiency, and duty cycle. Replacement projects should also verify installation or loading conditions, interfaces, and compatibility with the existing system; new projects should consider operating practice, maintenance, and spare-parts or consumables availability.
Product family overview
5 product familys on this page.
Ultra Pure Water
1 model in this family. Representative models: PAHT 2 - 12.5.
Tap Water
1 model in this family. Representative models: PAH 2 - 12.5.
Fire pumps / Tap Water
1 model in this family. Representative models: PAHF 20.
Energy Recovery Devices
2 models in this family. Representative models: iSave 21 Plus, iSave 50.
Quick Model Index
Fast lookup for 6 indexed products
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APP 0.6 - 1.0
Reverse Osmosis
Min. Speed Continuous: 700 rpm for all models · Max. Speed Continuous: Varies by model, ranging from 1200 rpm to 3450 rpm · Max. Outlet Pressure Continuous: 80 barg (1160 psig) for most models; some APP 11-13, APP 16-22, APP 38-46 models have 70 barg (1015 psig)
Danfoss APP pumps are high-pressure, positive displacement axial piston pumps designed for reverse osmosis applications, suitable for corrosive fluids.
PAHT 2 - 12.5
Ultra Pure Water
Min. outlet pressure: 30 barg (435 psig) · Media temperature: 2-50 °C (37-122 °F) · Ambient temperature: 0-50 °C (32-122 °F)
The Danfoss PAHT 2-12.5 is a positive displacement axial piston pump designed for technical water applications like ultra-pure and de-ionized water.
PAH 2 - 12.5
Tap Water
Flow: 1.0 l/min (1000 rpm), 2.0 l/min (1500 rpm), 0.4 gpm (1200 rpm), 0.7 gpm (1800 rpm) · Power: 0.9 kW (1500 rpm), 1.5 hp (1800 rpm) · Minimum Continuous Speed: 700 rpm
The Danfoss PAH 2-12.5 is a positive displacement, axial piston pump designed for high-pressure tap water applications.
PAHF 20
Fire pumps / Tap Water
Overall Flow Range: 14 to 115 l/min (3.7 to 30.3 gpm) · Minimum Flow Consumption (for temperature control): For PAHF 40 at 3000 rpm, 105 bar, a minimum of 24 l/min is recommended to prevent overheating when water is recirculated · Theoretical Flow (Qth): Q (th) [l/min] = pump displacement in cm³ × rpm/1000
The Danfoss PAHF 20 is a high-pressure axial piston pump designed for water mist fire extinguishing systems in land and marine applications. This maintenance-free.
iSave 21 Plus
Energy Recovery Devices
Flow Control: Vane pumps are fixed displacement, meaning flow is proportional to the driving shaft's revolutions, enabling flow control · Materials: All critical parts are made of high corrosion-resistant materials, specifically Super Duplex 1.4410/UNS 32750 or Duplex 1.4462/UNS 32803 · Speed Control: The electric motor provides speed control for both the pressure exchanger and the booster pump on the same shaft, preventing overspin/overflushing
The Danfoss iSave 21 Plus is an energy recovery device designed for high-pressure reverse osmosis systems, featuring an isobaric pressure exchanger, booster pump.
iSave 50
Energy Recovery Devices
Max. lubrication flow at 60 barg (871 psig): 25 l/min (6.6 gpm) · Peak flow, LP in: 120 m³/h (528 gpm) (at system start-up, for up to 10 min, 150% of max. rated flow) · Salinity increase at membrane at 40% recovery rate at balanced flow: 2-3% (dependent on NaCl concentration)
The iSave 50 is an Energy Recovery Device designed for reverse osmosis systems, featuring a compact isobaric pressure exchanger and vane pump combination.
Brand Products & Technical Documents
6 product profiles with integrated document access
Each card keeps the curated model introduction and combines the readable datasheet page, OEM PDF, and official source. Product understanding and document access now share one card set.
Reverse Osmosis
1 product profile
Pumps & Pumping
Product profile
APP 0.6 - 1.0
Danfoss APP pumps are high-pressure, positive displacement axial piston pumps designed for reverse osmosis applications, suitable for corrosive fluids.
Ultra Pure Water
1 product profile
Pumps & Pumping
Product profile
PAHT 2 - 12.5
The Danfoss PAHT 2-12.5 is a positive displacement axial piston pump designed for technical water applications like ultra-pure and de-ionized water.
Tap Water
1 product profile
Pumps & Pumping
Product profile
PAH 2 - 12.5
The Danfoss PAH 2-12.5 is a positive displacement, axial piston pump designed for high-pressure tap water applications.
Fire pumps / Tap Water
1 product profile
Pumps & Pumping
Product profile
PAHF 20
The Danfoss PAHF 20 is a high-pressure axial piston pump designed for water mist fire extinguishing systems in land and marine applications. This maintenance-free.
Energy Recovery Devices
2 product profiles
Pumps & Pumping
Product profile
iSave 21 Plus
The Danfoss iSave 21 Plus is an energy recovery device designed for high-pressure reverse osmosis systems, featuring an isobaric pressure exchanger, booster pump.
Pumps & Pumping
Product profile
iSave 50
The iSave 50 is an Energy Recovery Device designed for reverse osmosis systems, featuring a compact isobaric pressure exchanger and vane pump combination.