Low water pressure in a villa is usually caused by gravity-fed roof tanks, long pipe runs, undersized pipes or a weak pump; the fix is a multistage booster pump with a pressure kit, sized to your flow and the height of your highest outlet.
Common causes
- Roof tank is too low or too small, giving little gravity pressure.
- Pipe is undersized or has scale or partial blockages.
- An old or under-sized transfer pump.
- Too many outlets used at once.
- Air leaks on the suction side of a pump.
| Option | How it helps | Best for | Limitation |
|---|---|---|---|
| Multistage booster pump + pressure kit | Adds steady pressure on demand | Villas, townhouses, small buildings | Needs electricity and a space |
| Raise the roof tank | Increases gravity head | Where structure allows | Gives modest gain |
| Larger pipe diameter | Reduces friction losses | New builds, renovations | Cost and disruption |
| Pressure (expansion) tank | Smooths pressure, fewer pump starts | Add-on to pumps | Does not create pressure alone |
| Replace old pump | Restores performance | Worn pumps | Check if pump is simply undersized |
How to size a booster pump
- Count the outlets that may run at once (showers, taps, washing machine).
- Estimate the flow, typically 10–20 L/min per outlet.
- Measure the height to the highest outlet and the pipe length.
- Choose a pump whose curve delivers the flow at the head you need.
- Add a pressure kit so the pump runs only when water is used.
Alden options
Alden’s AMH horizontal multistage pump (0.8, 1 and 1.5 hp) is designed for quiet, steady pressure boosting, and works with the vertical pressure kit (220–240 V) and float switches.
Installation tips
- Mount on a solid base with flexible connectors.
- Keep the suction pipe short, large and air-tight.
- Fit a non-return valve and isolating valves.
- Protect from sun and standing water.
- Check local rules about connecting boosters directly to mains.
Frequently asked questions
Why is my water pressure low upstairs?
Pressure drops with height and pipe length. Roof tanks give only low gravity pressure; a booster pump raises it.
Do I need a pressure tank?
A small pressure (expansion) vessel reduces how often the pump starts and stabilises pressure.
Can I fit a booster pump myself?
Pump installation involves plumbing and electrical work; use a qualified technician.
How much does a booster pump cost?
Price depends on model, power and controls. Contact us for a quote.