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Category · Drinking-water tanks – hygienic drinking-water storage for buildings, trade & industry

Drinking-water tanks Roth building tanks & AquaBank® – 200 to 15,000 litres · KTW/DVGW · food-safe

Drinking-water tanks for hygienic and safe water storage – certified and food-safe. Two systems: Roth drinking-water tanks for stationary building installation (750–2000 L, certified to the KTW guideline and DVGW W270, green PE for narrow cellar rooms) and AquaBank® drinking-water tanks for trade and industry (200–15,000 L, UV-resistant, NIZP-PZH certificate, 5-year warranty).

✅ 200 to 15,000 litres ✅ KTW guideline · DVGW W270 ✅ Food-safe PE ✅ Roth · AquaBank® · 5-yr warranty

Roth drinking-water tanks – for cellar installation

The Roth drinking-water tanks (750–2000 L) are designed for stationary above-ground installation in buildings – with a narrow footprint (720–730 mm wide), ideal for tight technical rooms and cellars. Made of single-grade, tested green PE – opaque to prevent algae growth. Certified to the KTW guideline (UBA) and DVGW code of practice W270.

AquaBank® – for trade, industry & outdoor installation

The AquaBank® drinking-water tanks (200–15,000 L) are designed for commercial use in industry, construction, trades and agriculture – UV-resistant for indoor and outdoor installation. Food-safe PE, certified with the NIZP-PZH certificate. 4" maintenance opening, 1" drain connection with ball valve, 5-year warranty on the tank.

Certifications – what they mean

Special requirements apply to drinking-water tanks: the material must not release any substances harmful to health into the water. The KTW guideline (plastics in the drinking-water sector) of the German Federal Environment Agency and the DVGW code of practice W270 govern the microbiological and chemical requirements in Germany. The NIZP-PZH certificate is the Polish food-safety certification. Both systems confirm the food suitability of the PE used.

Areas of use

Drinking-water tanks are used for: emergency water reserves in buildings (businesses, agriculture), construction sites without a water connection, mobile water supply for events, regions with fluctuating drinking-water supply, civil protection and emergency preparedness, and as buffer storage in food production and the trades.

Choosing drinking-water tanks correctly – standards, material & use

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Roth building tank or AquaBank®?

Roth building tank: narrow (720–730 mm), tall (1600–1650 mm), for tight cellars and technical rooms, stationary, indoor installation, up to 2000 L. Certified to the German standards KTW + DVGW W270. AquaBank®: a variety of shapes and sizes (200–15,000 L), UV-resistant for indoor and outdoor installation, commercially robust, international NIZP-PZH certification, 5-year warranty. For outdoor installation or volumes over 2000 L, always AquaBank®.

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What does the KTW guideline mean?

The KTW guideline (plastics in the drinking-water sector) is the approval recommendation of the German Federal Environment Agency for plastics that come into contact with drinking water. Tested are: migration of chemical substances into the water, neutrality of odour and taste, and microbiological safety. A tank tested to KTW releases no substances harmful to health into the drinking water – a prerequisite for all drinking-water tanks used in Germany.

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What does DVGW W270 mean?

The DVGW code of practice W270 tests whether the material encourages the growth of germs and biofilms. A W270-compliant material inhibits bacterial growth and ensures that the drinking-water quality is maintained even during longer storage. For stationary drinking-water tanks in Germany, this test is decisive.

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How long can drinking water be stored?

In a clean, opaque, food-safe certified container, tap water can be stored for up to 6–12 months when kept cool (below 15°C). Heat and light encourage germ growth and considerably shorten the shelf life. The green colour of the Roth tanks and the opaque construction of the AquaBank® block light and prevent algae growth. For longer storage, check the water quality regularly and clean the container annually.

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Connections & installation

The Roth building tanks have: a DN 100 connector on the end face, 2× 2" screw connection with female thread on top, flange connection on the bottom. The AquaBank® has: 4" maintenance opening, 2" threaded connector on top, 1" drain connection with ball valve, vent filter. For the pipe connection, shut-off valves and backflow preventers are always recommended. When used as an emergency water reserve, a simple submersible pump is often sufficient.

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Do not use a drinking-water tank for rainwater

Drinking-water tanks and rainwater tanks must not be used interchangeably. A rainwater tank is not certified to KTW/DVGW W270 and is unsuitable for drinking water – even if it is made of similar PE. Separate pipe systems, clear labelling and separate tanks for drinking water and service water are mandatory under the TrinkwV.

Frequently asked questions about drinking-water tanks

A drinking-water tank is made of food-safe, certified PE that releases no substances harmful to health into the water. In Germany, drinking-water tanks must meet the KTW guideline of the Federal Environment Agency and the DVGW code of practice W270 – chemical safety, odour and taste neutrality, and no encouragement of germ growth. A normal rainwater or industrial tank does not meet these standards and must not be used for storing drinking water.
In a clean, opaque, certified drinking-water tank, fresh tap water can be stored for up to 6–12 months when kept cool (below 15°C). With warmer storage (above 20°C), germs can multiply faster – here, limit the storage time to 2–4 months. The tank must be thoroughly cleaned before filling, the water should come fresh from the tap, and the container must be opaque to prevent algae growth. For long-term storage, take a water sample regularly.
KTW guideline (plastics in the drinking-water sector): the recommendation of the Federal Environment Agency governs which plastics are approved for contact with drinking water. It tests the migration of chemical substances into the water and ensures that odour and taste are not impaired. DVGW W270: the code of practice of the German Technical and Scientific Association for Gas and Water tests whether a material encourages the growth of microorganisms in drinking water. Both certifications together are the proof of a container's drinking-water suitability in Germany.
The Roth building tanks (750–2000 L) are designed for indoor installation in a building and are not suitable for permanent outdoor use under UV radiation. The AquaBank® is expressly UV-resistant and suitable for outdoor installation. For outdoor installation, frost protection must be observed: drinking water must not freeze, as it otherwise becomes unusable and the tank can be damaged. Outdoors, insulation or the choice of a frost-free location is recommended.
Drinking-water tanks should be cleaned at least annually: 1. Empty the tank completely. 2. Rinse out with clean water. 3. Fill with a disinfectant approved for drinking water (e.g. sodium hypochlorite 0.1–0.5%) and leave to act for several hours. 4. Rinse at least three times with fresh drinking water until no chlorine smell is perceptible any more. The maintenance opening (4" on the AquaBank®, Ø 150–400 mm on the Roth) allows access for a sponge or brush. Never use normal household cleaners.
The German Federal Office of Civil Protection and Disaster Assistance (BBK) recommends keeping at least 2 litres of drinking water per person per day for a period of 10 days – that corresponds to 20 litres per person as a minimum supply. Including cooking and basic hygiene: 15 litres per person per day. A 750 L Roth drinking-water tank covers the basic supply (2 L/person/day for drinking) for a family of four for almost 100 days. Commercial operations should keep at least one day's requirement as a reserve.

The right drinking-water tank for your requirements

Our specialist team advises you free of charge – on volume, certification, installation location and the optimal solution for your drinking-water storage.

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