Process Water

Process and hot water tanks are a perfect solution for the energy industry. As one of the few in Poland, we design and manufacture above-ground heat accumulators that store thermal energy.

What are their uses?

Process water tanks according to your needs


Miltom supplies process and hot water tanks, which serve, among other things, as heat accumulators/buffers. These tanks are used mainly in fruit farming and heating, and wherever it is necessary from a technical and economic point of view.

Operating costs

The effect of using process water tanks is lower operating costs resulting from the high efficiency of the devices. Hot or raw water tanks are also an indispensable element of modern heating networks or heating in greenhouses, they are also used in fruit farming, because their efficiency increases the efficiency of the network by reducing transport delays and heat losses in the distribution process.We can store water in our tanks with a maximum temperature of up to 85 degrees Celsius.

Tank design

Hot water tanks
and industrial

Thanks to the appropriately selected insulating layer of the foundation, roof and cladding, the tank is protected against energy loss and accumulates heat inside when the demand for it is lower, and releases it when its consumption increases.

The thickness of the insulating layer depends on the technical requirements set by the customer and the parameters of the tank. The tightness of our tanks is ensured by the EPDM membrane, which is prefabricated by the manufacturer and dedicated to a tank of a specific size. The use of a membrane means that the walls do not have direct contact with water, which has a significant impact on the longer life of the tank, and as a result, it becomes an important economic factor.

Use of technological tanks

Custom-made tank for collecting process water

It is difficult to classify process water deposits in one sentence, as they are objects adapted to many different purposes and industries. These structures are most often used in:

Heat and power plants and boiler rooms

Agricultural and fruit farms

Horticultural farms and greenhouses


Projektowane przez nas zbiorniki wody technologicznej wykonywanie są zgodnie rygorystycznymi normami bezpieczeństwa:

FM Approvals, PN-EN, VdS, NFPA-22

Additional information

Advantages of our tanks


During the implementation of the contract for the construction of a process water tank, Miltom provides an executive design until obtaining a building permit, as well as construction and as-built documentation of the tank prepared by an authorized designer.


Reducing maintenance costs and low consumption of fuel burned in boilers


Reducing emissions of harmful substances and reducing environmental pollution


Possibility of receiving a subsidy from the European Union for the construction of the reservoir

Warranty package

Warranty protection and additional post-warranty packages from Miltom


Any existing steel drinking water tank – both built by us and other manufacturers – can be covered by our warranty and service. The service is provided after purchasing the warranty protection package we offer. The basis for issuing such a guarantee is that we carry out a technical inspection of the existing drinking water tank before signing the contract.


Technical Specifications

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A series of types of process water tanks

  • Download the size chart file
  • The diameter of the tanks ranges from 3.1 m to 21.7 m
  • The height of the tanks is from 2.4 m to 13.2 m
  • It is possible to build a tank of a higher height

Performance standards

  • PN – B – 02857:2017-04
  • PN-EN 1990:2004/AC:2010 Eurokod
  • PN-EN 1991 – 1 – 1:2004/AC:2009
  • PN-EN 1993-1-1:2006/AC:2009
  • PN-EN 1993-1-3:2008/AC:2009
  • PN-EN 1993-4-2:2009
  • PN-B-03210:1997/Az1:2002
  • PN-EN 1993-1-6:2009

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Tank design

  • Sheets of 1.25 m x 2.5 m of galvanized steel, grade S350GD + Z275 or S355.
  • The thickness of the jacket depends on the size of the tank, the required standards and the standard of workmanship. Individual sheets are screwed together with M12 screws at the construction site.
  • The tank shell is attached to the concrete foundation using galvanized angles, brackets and anchors.
  • Painting the tank. It is possible to powder-coat the sheet metal surfaces or cover the installation casing with trapezoidal sheets in a selected RAL color from the available „Pruszyński” color palette. Additional painting of the tank shell or a façade made of trapezoidal sheet metal constitutes an additional layer of protection against the effects of the external environment, significantly prolonging the proper operation of the tank and its failure-free operation, and also provides an additional visual and aesthetic effect.
  • The roof of the fire water supply tank is a stable, self-supporting structure, made of special cold-bent Z-type profiles Z250, Z300, Z350 covered with T35 trapezoidal sheet metal or optionally – at the Investor’s request – insulated sandwich panels. We use „Arpanel” sandwich panels with a core of rigid PIR polyisocyanurate foam with a thickness of D 40/80, D 60/100, D 80/120, D 100/140, as well as Arpanel PUR boards with a polyurethane core with a thickness of D 40/80 , D 60/100, D 80/120, D 100/140. The shape of the roof structure ensures free drainage of rain and snow from the roof surface to each side of the tank.
  • The tightness of the tank is ensured by the use of a prefabricated EPDM synthetic membrane with a thickness of min. 1.00 mm adapted to the dimensions of the tank. EPDM has good properties for reversible deformation under the influence of mechanical forces, while maintaining the continuity of its structure. The material retains its flexibility in the temperature range of -40 °C to +110 °C regardless of the prevailing weather conditions.
  • Seal selection option. At the customer’s request, we also use a polyvinyl chloride membrane, the so-called PVC, min. thickness 0.75 mm, adapted to the dimensions of the tank. It is characterized by high mechanical strength and resistant to many solvents.
  • The membrane is separated from the tank foundation with a 300g/m2 polypropylene geotextile, which protects it against mechanical damage during installation and operation.
  • Thermal isolation. Each tank is equipped with 40 mm thick Styrodur thermal insulation located between the membrane and the tank jacket along the entire height of the tank, attached to the walls of the tank structure with screws and glue. This location of the insulation ensures long-term preservation of thermal properties and no degradation of the material under the influence of moisture.
  • Insulation selection option. At the Investor’s request, external insulation made of ProRox SL 960PL mineral wool with a thickness of 10 cm can be used, additionally protected from the outside with a T18 x 0.7 trapezoidal sheet painted in any color from the RAL color palette.

Tank equipment

  • Pipes selected for a specific tank according to types and standards.
  • Electric heaters mounted in pairs on the tank wall 0.5 m below the water surface – from 3 kW – 18 kW ~ 400 V.
  • Inspection hatches mounted on the roof of the tank.
  • Inspection and service hatch mounted in the lower, lowest row of tank shell panels. The standard used determines the number of service hatches to be installed.
  • Galvanized ladder enabling access to the hatch on the tank roof.
  • Control cabinet responsible for the operation of the heaters, controlling the level and temperature of the water in the tank.
  • Materials used ensure that the investor is provided with the highest quality product that meets the strict requirements of norms and required standards.
  • Modular structure allows for quick installation, as well as the possibility of any modifications to increase the required tank capacity, if necessary.
  • Connections the tanks are equipped with all necessary connections and devices required for efficient cooperation with the combustion and electric pumps used.
  • High quality allows you to obtain a long-term warranty ensuring many years of failure-free use of the tank and the certainty of failure-free operation for many years.

Call or write to
our expert →

Each water storage tank is different, which is why we offer a free consultation at the stage of preparation for the project


We will help you choose the right dimensions and parameters of the tank, tailored specifically to your investment.

Water storage tanks

Krzysztof Polak