Domestic waterworks: how to increase the pressure

If there is no longer enough water available in the pressure tank of a domestic waterworks, the pressure must be increased. The following guide shows how the setting can be made.

Minimum and maximum

The domestic waterworks is a system that is regulated by two settings, among other things: the minimum pressure and the maximum pressure.

If the pressure falls below the minimum, more water is pumped. How much and how fast the water is pumped depends on two factors. On the one hand, on the size of the pressure vessel. On the other hand, there is the difference between the minimum pressure and the maximum pressure. The greater the difference between the two pressure settings, the more water can be pumped.

Lowering the minimum pressure and increasing the maximum pressure can therefore increase the delivery rate.

Included

a few points should be noted:

• The minimum pressure or switch-on pressure should be between 1.0 and 2.0 bar
• Ideal pressure must be determined individually
• Maximum pressure is optimal between 3 and 4 bar
• Use a manometer or pressure measuring device for checking
• it is important to pay attention to the manufacturer's instructions
• Print settings may differ depending on the model

Tip: The ideal cut-in pressure is usually 1.5 bar. However, it is necessary to adapt the pressure to the respective conditions in order to keep the water column at the appropriate level.

Adjustment error

If there are setting errors, various problems can arise. This can also be an indication that the pressure is too high or too high

is low. These factors include the following:

• the domestic waterworks no longer switches off, but runs continuously
• no water is attracted
• the delivery rate is too low
• the membrane between the two chambers of the pump can be damaged

By checking the pressure gauge, you can quickly determine whether the pressure is in the optimal range or should be increased.

Increase pressure - instructions

In order to vary the pressure or the difference between the settings, the manufacturer's instructions must again be observed. However, usually only the following steps are required:

1. The adjustment screws for the pressure are located under a cover on the so-called pressure switch. The plastic cover must first be removed.
   
2. There are two screws behind the cover. As a rule, the large screw is the cut-in pressure or the minimum pressure.
   
3. The pressure can be increased by turning the screws. The pressure gauge must be checked during and after the settings.
   
4. Finally, the cover only needs to be reattached.

Several factors are critical in increasing the pressure. The following points are important:

• Observe the manufacturer's instructions
• Lowering the minimum pressure also increases the delivery rate
• the settings should be neither below 1 bar nor above 4 bar
• Increasing the pressure should ideally be done gradually

Tip: If there seems to be a lack of pressure, it could also be due to defects in the line or other problems. Preventing pressure loss may therefore be a better measure.

Prevent pressure loss

Various measures are recommended to prevent pressure loss. These include:

• regular maintenance
• professional installation
• frequent cleaning and filter changes
• Checks of pipes, seals and connections
• Appropriate selection of the domestic waterworks for the corresponding delivery depth

Tip: Especially after changing the filter, the pressure should be checked carefully and adjusted if necessary.