Pressure tanks

A pressure tank keeps the plumbing pressurised while the pump is off, smooths pressure surges and reduces the number of pump starts — so the pump lasts longer and the flow at the tap stays steady. This section has GWS tanks for cold water: vertical and horizontal, in steel, stainless steel and composite, from compact 18–24 L models up to 500 L.

• 18–24 L — a summer house or small home with a booster set;
• 50–100 L — a family house with a borehole pump;
• 150 L and more — a large house, several bathrooms, garden watering.

We explain how to work out volume and pressure in “How to choose a pressure tank”, and a step-by-step guide shows how to check the air charge.