When dealing with drinking water, only technically and hygienically optimised solutions, from the planning stage right through to operation, can guarantee the required water quality.

From an economic and hygienic point of view, “streamlined” installations are the optimal aim of the planning procedure. For this reason, 1) every seldom used extraction point should be looped into the system and 2) the main extraction point or flushing system should be placed at the end of the branch line.


A prerequisite for regular and complete water exchange – already in operation carried out as intended – is the intelligent structuring of consumers along the storey.

A T-piece installation can be used in buildings or areas without increased hygiene requirements for frequently used extraction points with short connection pipes.

Serial pipe systems are the system of choice, so that pipes with seldom used extraction points, such as frost-proof external fittings are not a danger for the rest of the installation. By doing this, the extraction points are connected using wall plates with two outlets and with a regularly-used end extraction point, e.g. a WC system (possibly combined with a flushing system).

A ring pipe system is useful if, due to increased hygiene requirements, a serial pipe system is out of the question, e.g. because there is no main extraction point. In this way, multiple users can be looped in – even those in other rooms. If water is used in one of the rooms, water flows from both sides and flushes through the unused extraction point.


Choice of Materials


Unsuitable materials can cause the transfer of unwanted nutrients into the drinking water of a domestic installation. EN 12502 describes the influence of material parameters on drinking water quality. All materials used by Viega fulfil these requirements.


Plan the Optimal Dimensions


In the field of drinking water installations, the use of smaller piping systems in combination with flow-enhancing components is extremely advantageous both in terms of hygiene and cost-effectiveness. On the one hand, you can prevent an increased use of material and on the other; you reduce the amount of water in the pipes.


To prevent over-dimensioning, the exact calculation of the actual amount of water extracted and the synchronisms of the particular building are necessary. Using the values which can vary within a certain bandwidth, e.g. the flow rate in respect to real pressure losses, the dimensions in the network pipe can be considerably reduced. By using low pressure loss shut-off valves, e.g. ball valves, extra pressure potential can be used.


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Installation and commissioning of drinking water installations

Viega Pexfit Pro
Pressure loss-optimised piping systems and connectors with flow-enhancing geometry help provide noticeably improved flow performance and hygiene.