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Drinking Water Protection

Drinking water is our most important resource. It is needed every day for drinking, cooking and washing. However, in order to keep it clean and hygienic, and therefore harmless to health, it must be protected in the pipes of the drinking water systems. A vital factor for a hygienically clean water supply is the protection of the drinking water in the pipeline system from contamination by non-drinking water. This is governed by the standard DIN EN1717 Drinking water protection and water hygiene according to EN1717.

DIN EN1717 divides all liquids into five categories based on the potential hazards for the person who might be exposed to this water. It also establishes the need for safeguarding to guarantee reliable drinking water protection.​

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Benefits

Applications & Products


​Honeywell Home is the perfect partner, offering you the right solution for your pipe fittings to protect against hazards from all fluid categories.

Category 1 (Drinking water)

Category Requirements
Water for human consumption, which is taken directly from a drinking water installation. For water of this category no protection is necessary.

Category 2 (altered drinking water, no health hazard)

Category requirements
Category 2 fluids do not pose a threat to human health, but are different from category 1 drinking water in terms of smell, taste, temperature or colour. A category 2 fluid must be at least protected by an EA type backflow preventer. Liquid foods such as tea, coffee, juice etc. belong to liquid category 2 as well as saline fluids or drinking water after preparation or disinfection etc.

Applications:

  • Water entering houses
  • Water entering blocks of flats
  • Drinking water supply for office buildings, schools, kindergartens etc.
  • Heating systems for drinking water
  • Individual safeguard on beverage or coffee machines

Category 3 (moderate health hazard)

Category requirements
Category 3 fluids may present a moderate health hazard to humans through the presence of one or more toxic substances and therefore must be secured, for example, by means of a CA type system separator or a GA type pipe separator. Examples of category 3 liquids are bathwater (in the domestic area), heating water without inhibitors or dishwashing water

Applications:

  • Heating water refill (without inhibitors)
  • Industrial refilling equipment e. g. cooling systems
  • Disinfection equipment in large kitchens
  • Flushing and cleaning device for dispensing systems

Category 4 (strong health hazard, non-biological)

Category requirements
Liquids which can cause serious health hazards to humans due to the presence of toxic, radioactive, mutagenic or carcinogenic substances are assigned to liquid category 4. In this case, the protection is provided, for example, via a GB type pipe separator or a BA type system separator. The category 4 fluids include heating water with additives, swimming pools in the domestic area with automatic water treatment and disinfection, as well as water from high pressure cleaners with cleaning additives

Applications:

  • Water supply of chemical laboratories in schools, photo laboratories
  • Temporary connection points with standpipes e. g. at fairs
  • Refilling equipment e. g. heating systems with additives, cooling systems
  • Protection of dosing systems of industrial washing machines and dishwashers

Category 5 (severe health hazard, biological)

Category requirements
The highest protection requirement is placed on category 5 fluids. These fluids can present a significant health hazard to humans as they may contain microbial or viral pathogens of communicable diseases. This is the case with swimming pools in public/commercial areas as well as with rain water and fire extinguishing systems.

Applications:

  • Rainwater systems
  • Fire extinguishing systems
  • Supply lines in sewage treatment plants
  • Agriculture: for the water supply of cattle troughs
  • Biological laboratories
Protection up
to liquid category
Threaded connection
Flange connection
Drinking water application
Heating water application
Use in
domestic area
Use in
commercial area
Use in
industrial area
Housing material
Group/type according to
DIN EN 1717
Ball valve for backflow prevention
RV277
Backflow preventer
RV281
Backflow preventer
RV283P
System breakers
CA295
Refill combination
NK295C
Pipe separator
R295
System breakers
BA295D-3/4WH
System breakers
BA295D-1/2ASC
System breakers
BA295CS
System breakers
BA295S
System breakers
BA298I-F
System breakers
BA300
Fully automatic
Pipe separator

R295HP-F
Refill unit
NK300S
Safety barrier station
CBU140
Safety barrier station
CBU144/145

CBU146
2 2 2 2,3 2,3 2,3 2,3,4 2,3,4 2,3,4 2,3,4 2,3,4 2,3,4 2,3,4 2,3,4 2,3,4,5 2,3,4,5 2,3,4,5
R 1/2“–R 2“ R 1/2“–R 2“ R 1/2“–R 3/4“ R 1/2“ R 1/2“–R 2“ R 3/4“ R 1/2“ R 1/2“–R 2“ R 1/2“–R 2“ R 1/2“ R 3/4“
DN40–DN300 DN65–DN150 DN65–DN200 DN65–DN200 DN50–DN80 DN50–DN80
Brass Brass Grey cast iron Brass Brass Red brass Brass Brass Brass Brass Stainless Steel Grey cast iron Grey cast iron Brass
EA EA EA CA CA GA BA BA BA BA BA BA GB BA AB AB AB