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Home | News | PED Compliance: Steam Generators vs. Firetube Boilers

Published: Mar 26, 2026

PED Compliance: Steam Generators vs. Firetube Boilers

Pressure Equipment Directive 2014/68/EU (PED)

Pressure Equipment Directive 2014/68/EU (PED)

The Pressure Equipment Directive 2014/68/EU (PED) defines the legal framework for pressure equipment placed on the European market.

When comparing modern steam generators and traditional firetube boilers, the main differences from a PED perspective relate to water volume, equipment classification, inspection scope, and installation requirements. 

PED Classification

Under the PED, pressure equipment is classified based on:

  • Maximum allowable pressure (PS)
  • Volume (V)
  • Fluid group (steam = Group 2)

Because firetube boilers contain a large volume of water, they often fall into higher PED categories (III or IV). This typically requires Notified Body involvement and more extensive conformity assessments.

Modern steam generators contain much less water, which often results in a lower PS × V value. This can simplify the certification process while remaining fully compliant with PED requirements.

 

Stored Energy and Safety

The water volume in a steam system directly influences the stored thermal energy.

Firetube boilers store significantly more energy, which increases the severity considerations in risk assessments.

Steam generators contain much less stored energy, which supports an inherently safer design and simplifies safety evaluations.

Impact on Boiler Room Location

Impact on Boiler Room Location

The PED classification and the amount of stored energy in the equipment can influence where a steam system is installed within a facility.

Due to their large water volume and higher stored energy, firetube boilers typically must be installed in a dedicated boiler room or separate boiler house at a safe distance from production areas. This requires additional building infrastructure and increases installation costs.

Compact steam generators, on the other hand, contain significantly less water and stored energy. As a result, they can often be installed directly next to the point of use, without the need for a separate boiler room. This simplifies integration into existing facilities, reduces installation costs, and minimizes steam distribution losses.

Insurance and Risk Management

Steam installations are typically covered by several types of industrial insurance, including:

  • Machinery breakdown insurance for pressure equipment
  • Business interruption insurance in case of production downtime
  • Industrial liability insurance

Systems with lower stored energy and smaller pressure vessels may present a lower operational risk profile, which can influence inspection requirements and insurance conditions.

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Compliance by Design

Both firetube boilers and steam generators can fully comply with the Pressure Equipment Directive 2014/68/EU.

However, by reducing water volume and optimizing pressure component design, modern steam generators can lower regulatory complexity, simplify installation, and reduce operational risk—without compromising safety.

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