Help & support / Sewage pumping station sizing guide
Sewage pumping station sizing guide
Find a pumping station
Tell us what you need to pump and how far it needs to go. We’ll suggest chamber sizes to compare and flag when the installation needs a technical review.
What size pump do I need for a two-bedroom house?
Start with the number of people and fixtures connected to the station. Then measure the pipe route and check how much flow the pump can deliver at the required head. The same bedroom count can lead to different pump choices.
Learn how a sewage pumping station works
Start with the installation, then choose the station. A chamber’s litre rating describes its nominal capacity; it does not tell you the number of toilets it can serve or how far the pump will move sewage. This guide helps you prepare a useful specification for Sewage Station Direct and your installer.
1. Describe what will drain into the station
List the toilets, showers, sinks and other connected appliances. Explain whether this is an occasional-use outbuilding, an additional bathroom or the main drainage route for a home. Identify whether the liquid is raw sewage, greywater or another type of wastewater. Keep proposed rainwater connections separate in your notes because storm flows need their own assessment.
2. Measure the route, not just the distance
Record the vertical rise and the approximate pipe length to the receiving drain. Add the planned pipe diameter, bends and changes in level. A rough site sketch with measurements is more useful than saying the sewer is “nearby”. Your installer should confirm the discharge point and any connection requirements before work starts.
3. Compare chamber capacity and physical dimensions
Our range includes 190, 300, 450, 550, 800, 1,100, 1,400, 1,700 and 2,000 litre stations. Check both diameter and height on the product page, together with the inlet depth and available installation space. Nominal chamber volume is not the same as usable emergency storage: liquid levels, inlets and controls affect how much spare capacity remains.
For example, the 190 litre station and 1,100 litre station have different chamber capacities. That alone does not establish a higher pumping distance for the larger model.
4. Check the pump duty
Our standard station option is listed with a 6 metre maximum lift and a 100 metre maximum horizontal distance, with 10 metre and 30 metre lift upgrades available. These are separate maximum figures, not a combined performance promise. Confirm the required flow at the actual duty using the appropriate technical information. See our lift and distance guide.
5. Decide whether a second pump is appropriate
A single pump can suit a smaller setup. Where loss of drainage would affect the whole home, consider the resilience of a twin system and an alarm. Our 1,100, 1,400, 1,700 and 2,000 litre products offer a Dual Pump option for £999 extra. Read single versus twin pump systems.
Send us your project details
- What is connected and how regularly it is used.
- The estimated vertical rise, total pipe run and pipe size.
- A site sketch, inlet depth and access restrictions.
- The power supply and any backup or alarm requirement.