Pressure tanks (also called pressure vessels or expansion tanks) store water under pressure so your pump doesn’t have to start every time a tap opens. Fewer starts means a cooler motor, a longer pump life and steadier pressure at the shower. We stock 24L, 36L, 50L, 60L and 100L steel bladder tanks in vertical and horizontal versions, from R860. They suit booster, pressure and borehole pump systems and pair with our 1–6 bar pressure switch.
Frequently asked questions
What size pressure tank do I need?
For a home booster pump, 24 to 60 litres is common; 100 litres or more gives fewer pump starts and longer pump life, especially on boreholes. Bigger is better if you have space.
What should the air pressure in my pressure tank be?
Set the tank pre-charge about 0.2 bar below the pump cut-in pressure, measured with the water drained from the tank.
Can I replace just the bladder?
On many tanks, yes. Replacement EPDM bladders are available for common sizes such as 24 L and 100 L.
What size pressure tank do I need?
A bigger tank means your pump starts and stops less often, which saves wear on the motor and the pressure switch. As a guide:
- 24L – a flat or small home, or an extra tank for an existing system
- 36L to 60L – a typical family home with two or three bathrooms
- 100L – larger homes, garden irrigation and borehole systems, where the pump should run less often
If your pump keeps switching on and off (short cycling), or the pressure pulses in the shower, the tank has usually lost its air charge or is too small for the system.
Setting up a pressure tank
With the tank empty of water, set the air pre-charge about 0.2 bar below your pump's cut-in pressure, using a tyre gauge on the valve. Check it once or twice a year. Choose vertical or horizontal to suit the space you have.
Pair your tank with one of our pressure pumps and a pressure switch or flow control. Not sure which size fits? WhatsApp or call us on 012 881 1962 with your pump model and number of bathrooms, and we'll recommend one. We deliver nationwide.