Available Options
Grundfos Sololift2 – wastewater stations for toilets, showers and sinks
Grundfos Sololift2 are compact automatic wastewater lifting stations designed for premises where wastewater cannot be led to the main sewer by a natural slope. They enable the construction or renovation of a bathroom, toilet, shower, sink, laundry room or kitchenette in a basement, attic, extension or remote area of the building.
What is Sololift2?
Sololift2 collects the wastewater from the connected sanitary appliances in an integrated tank. When the level reaches a start value, the pump is automatically switched on, pumps the water to the main sewer riser and stops when the stop level is reached. This allows the sanitary room to be built below the sewer level or at a location remote from the main sewer riser.
When is a Sololift2 station suitable?
- In a bathroom, toilet or wet room in a basement below the sewer level.
- In attics where the necessary natural slope cannot be provided.
- When reconstructing, modernizing or adding a new bathroom.
- When building a bathroom in an office, hotel, guest house, vacation property or extension.
- In sanitary facilities for the elderly or people with reduced mobility.
- When the new sanitary appliance is at a great distance from the main sewer riser.
- For protection against backflow to rooms below the sewer level when the installation is properly designed.
How to choose a model?
General advantages
- Ready-to-install automatic station.
- Composite tank with smooth, easy-to-clean inner surface.
- Sloped bottom to limit sediment accumulation.
- Dry motor for clean and fast servicing.
- The pump-motor module can be dismantled without disconnecting the inlet and outlet pipes.
- Flexible connectors and adapters for different pipe diameters.
- Built-in check valve in the outlet adapter.
- Possibility of installing an additional alarm for higher safety requirements.
- Separate connection for draining the tank during service.
Important limitations
- WC-1, WC-3 and CWC-3 are for wastewater from toilets with toilet paper and feces.
- D-2 and C-3 are only for gray water without feces.
- Do not throw away non-biodegradable items, textiles, wet wipes, plastics, metal, glass, hygiene products in large quantities, fats or aggressive chemicals.
- Check the maximum liquid temperature for the specific model before connecting a washing machine, dishwasher or bathtub.
- The first section of the pressure pipe must be vertical, and the horizontal sections must have a minimum slope of 1% towards the main sewer riser.
Construction and functions
Sololift2 is designed for quick installation, reliable automatic operation and easy servicing. The specific pump type and inlets depend on the model selected.
| Component / function | Purpose | Availability |
|---|---|---|
| Cutting tool | It shreds toilet paper, feces, and degradable waste so that it can be pumped through a small diameter pressure pipe. | WC-1, WC-3, CWC-3 |
| Vortex pump with free passage 20 mm | Suitable for grey water, including from washing machines and dishwashers; reduces the risk of blockage by small solid particles. | C-3 |
| Pump with free passage 10 mm | Compact solution for grey water from sink, shower and bidet. | D-2 |
| Dry motor | Provides cleaner and easier access for servicing; the pump-motor unit can be removed without dismantling the tank and pipes. | All models |
| Thermal protection | The thermal switch protects the motor from overheating and allows automatic restart after cooling. | All models |
| Ventilation valve with carbon filter | Limits odors and includes overflow protection; a ventilation pipe can be connected if needed. | All models |
| Built-in check valve | Limits backflow to the station and to the connected inlet pipes. | All models |
| 360° rotating output adapter | Allows vertical or horizontal direction of the pressure pipe according to the installation. | WC-1, WC-3, CWC-3, C-3 |
| Anti-blocking function | Allows manual rotation of the shaft with a screwdriver from the outside, without opening the housing. | WC-1, WC-3, CWC-3 |
| Adjustable starting level | Two possible starting levels – low for flat shower trays and higher for a washing machine, bathtub or larger inflow. | C-3 |
| Alarm option | Slot or pre-prepared place for additional alarm according to the model. | All models |
Installation guidelines
- The station must remain accessible for inspection and service.
- Install the station as close as possible to the sanitary appliance when the model is for a toilet.
- WC-1 and WC-3 must be directly behind a floor-standing toilet in the same room; the maximum distance when using a connecting piece is 150 mm.
- CWC-3 is for wall-mounted toilet and pre-wall construction.
- The first section of the pressure pipe must be vertical, and the horizontal section thereafter must have a minimum slope of 1% towards the sewer.
- Do not exceed the maximum pressure and match the diameter and length of the pressure pipe to the specific model.
- Use appropriate adapters and flexible connectors for the selected inlet and outlet pipe diameter.
Temperature and fluids
| Model | Suitable wastewater | Maximum temperature | pH |
|---|---|---|---|
| WC-1 / WC-3 / CWC-3 | Black and grey wastewater from toilet and related sanitary appliances | 50 °C | 4–10 |
| C-3 | Graywater without feces; washing machine, dishwasher, bathtub, shower, sink, kitchen sink, softener brine | 75 °C continuous; 90 °C up to 30 min | 4–10 |
| D-2 | Greywater without feces from a sink, shower or bidet | 50 °C | 4–10 |
Approvals and standards
Grundfos Sololift2 stations are CE marked and according to the technical catalogue are VDE, TÜV, LGA and EAC approved. The series is designed according to the relevant European standard for the type of wastewater. [8]
| Approval / standard | Meaning | Applicable models |
|---|---|---|
| CE | Compliance with applicable European safety, health and environmental protection requirements. | All Sololift2 models |
| VDE, TÜV, LGA, EAC | Markings and approvals specified by the manufacturer for the Sololift2 series. | Sololift2 series |
| EN 12050-3 | Standard for small lifting stations for wastewater with fecal matter for a limited number of users. | WC-1, WC-3, CWC-3 |
| EN 12050-2 | Standard for small lifting stations for wastewater without fecal matter. | C-3, D-2 |
Why is the standard important?
- Fecal toilets: For stations that receive wastewater from a toilet, an EN 12050-3 model is required – WC-1, WC-3 or CWC-3.
- Greywater: If there is no toilet and only greywater is pumped, a model according to EN 12050-2 – C-3 or D-2 is used.
- Correct installation: Compliance with the intended use of the model, temperature limits and installation conditions is essential for the reliability and compliance of the installation.
Sololift2 model comparison
Choose the model according to the sanitary appliances you will connect. The most important difference is whether the system includes a fecal toilet or only gray waste water.
| Characteristics | D-2 | WC-1 | WC-3 | CWC-3 | C-3 |
|---|---|---|---|---|---|
| Product number | 97775318 | 97775314 | 97775315 | 97775316 | 97775317 |
| Wastewater type | Greywater without feces | Black and gray water with feces | Black and gray water with feces | Black and gray water with feces | Greywater without feces |
| Toilet | No | Yes, floor-standing with horizontal outlet | Yes, floor-standing with horizontal outlet | Yes, wall/pre-wall | No |
| Suitable sanitary appliances | Washbasin, shower cabin, bidet | Toilet and washbasin | Toilet, sink, shower, bidet or urinal | Wall-mounted toilet, washbasin, shower, bidet or urinal | Washing machine, dishwasher, bathtub, shower, washbasin, kitchen sink, softener |
| Pump type | Clearance 10 mm | Cutting tool | Cutting tool | Cutting tool | Vortex, free passage 20 mm |
| Maximum pressure | 5.5m | 8.5m | 8.5m | 8.5m | 8.8m |
| Maximum flow rate | 105 l/min | 149 l/min | 149 l/min | 137 l/min | 204 l/min |
| Power P1 max. | 280W | 620W | 620W | 620W | 640W |
| Maximum temperature | 50 °C | 50 °C | 50 °C | 50 °C | 75 °C continuous; 90 °C up to 30 min |
| Reservoir | 2 liters | 9 liters | 9 liters | 9 liters | 5.7 liters |
| Weight | 4.3 kg | 7.3 kg | 7.3 kg | 7.1 kg | 6.6 kg |
| Standard | EN 12050-2 | EN 12050-3 | EN 12050-3 | EN 12050-3 | EN 12050-2 |
Which model to choose?
- D-2: Choose if you only need to pump water from a sink, shower or bidet and installation space is limited. Not for a toilet, washing machine or dishwasher.
- WC-1: Choose for a small toilet with one floor-standing toilet and one washbasin.
- WC-3: Choose for a full bathroom with a floor-standing toilet, sink, shower and bidet/urinal.
- CWC-3: Choose when the toilet is wall-mounted and installed in a pre-wall construction; also suitable for washbasin, shower and bidet/urinal.
- C-3: Choose for a laundry room, kitchen, bathroom without toilet or for warmer grey water. This is the right model for a washing machine, dishwasher, bathtub and softener.
The data is consistent with the provided technical catalogue for Grundfos Sololift2. Check the specific model, type of sanitary appliances, waste water temperature, installation distances and discharge pipe characteristics before ordering and installation.