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Security report for stiebel-eltron.co.uk

STIEBEL ELTRON GmbH & Co. KG · Energy · United Kingdom

Medium risk. 4 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

65/100

Risk levelMedium

0–100, higher is better. How it is calculated

STIEBEL ELTRON UK is a subsidiary of the STIEBEL ELTRON Group, specializing in manufacturing and distributing renewable energy heating solutions such as heat pumps, solar systems, and electric hot water products. The company targets homeowners, installers, and partners in the UK market, offering comprehensive product ranges and aftersales support. The website reflects a mature and professional business with consistent branding and a strong focus on renewable energy technologies. Technically, the site is built on Adobe Experience Manager with modern JavaScript libraries and integrates Piwik PRO for analytics with GDPR-compliant cookie consent mechanisms. Security posture is strong with HTTPS enforced and secure form handling, though explicit security headers and incident response contacts are absent. The WHOIS data is unavailable due to domain naming rules issues, which slightly impacts trust but the website content and external references support legitimacy. Overall, the site is well-designed, user-friendly, and compliant with privacy regulations, positioning the company as a credible player in the energy sector.

Scanned

NIS2 and GDPR posture

GDPR outside view
53/ 100 · Medium
Checks completed
7of 7

NIS2 Art. 21(2)

  1. (a) Risk analysis and security policies: Not visible from outside
  2. (b) Incident handling: One indicator
  3. (c) Business continuity, backups and crisis management: Not visible from outside
  4. (d) Supply chain security: Not visible from outside
  5. (e) Secure acquisition, development and maintenance, including vulnerability handling: Partly checked
  6. (f) Assessing the effectiveness of security measures: Not visible from outside
  7. (g) Cyber hygiene and security training: Not visible from outside
  8. (h) Cryptography and encryption: Partly checked
  9. (i) HR security, access control and asset management: One indicator
  10. (j) Multi-factor authentication and secured communications: Not visible from outside

This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.

GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.

Priority findings

4 findings rated critical or high. Fix these first.

  1. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1

  2. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • High

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

  3. Network security

    Services reachable from the internet are the first thing attackers probe. Anything open that does not need to be should be closed.

    • High

      High-Risk Service Exposed: FTP

      Port 21 (FTP) is publicly accessible - FTP - Often unencrypted file transfer

      What to do: Consider restricting access to FTP or implementing strong authentication

      • NIS2 21(2)(e)
      • IR 2024/2690 6.7.2(f): Implementing Regulation (EU) 2024/2690, Annex point 6.7.2(f): Network security
      • NIST CM-7: NIST SP 800-53 Rev. 5 CM-7: Least Functionality
      • NIST SC-7: NIST SP 800-53 Rev. 5 SC-7: Boundary Protection

Need hands-on remediation? Email guard@offseq.com

Keep watching stiebel-eltron.co.uk

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  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

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Results by check

Each check with its score, findings and the evidence it collected.

How this score is calculated

The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.

Counted in this score

SSL/TLS
90
Security headers
70
Email security
85
DNS health
70
Network security
20
GDPR outside view
53
Average
65

Not counted

  • NIS2 outside view: Re-weights evidence from the TLS, email, DNS, network and hygiene checks, so counting it would count that evidence twice. Shown on its own.
  • OffSeq Observations: An AI reading of the site, useful context but not reproducible evidence. Shown on its own.

Findings that cap the score at 49

Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.

  • The certificate is not trusted by browsers
  • The website is not served over HTTPS
  • A database, remote desktop, file-sharing or Telnet service is reachable from the internet
  • The page loads a script from a compromised source
  • The domain registration has expired
  • SPF authorises every server to send mail as the domain

Partial scans

When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.

Risk levels

  • Critical0–25
  • High26–49
  • Medium50–75
  • Low76–100

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

The company holds a strong market position in the renewable energy heating sector, leveraging a long history since 1924 and a global parent company. Its business model focuses on manufacturing and direct sales through installers and partners, supported by digital tools such as installer registration and training. The website's multilingual and regional versions indicate a broad international footprint. The presence of compliance and code of conduct pages suggests a commitment to corporate governance. The company actively engages customers and partners via social media and provides extensive product and support information, indicating a customer-centric approach. No direct revenue streams or financial data are disclosed, but the comprehensive service offerings and certifications imply a stable and established business.

Security posture

The website demonstrates a good security posture with HTTPS enabled and secure cookie consent management. The use of Piwik PRO analytics is privacy-conscious, with options for anonymous tracking and cookie opt-in/out. However, the absence of explicit security headers such as Content Security Policy (CSP), HSTS, and X-Frame-Options reduces the overall security hardening. No visible vulnerabilities or exposed sensitive data were detected in the HTML content. The lack of a published security.txt or incident response contact limits transparency for vulnerability reporting. Overall, the site is secure for general users but could improve in advanced security practices and incident readiness.

Recommendations

  1. Implement and publish security headers including CSP, HSTS, and X-Frame-Options to enhance protection against common web attacks.
  2. Publish a security.txt file and provide clear incident response contact information to facilitate responsible vulnerability disclosure.
  3. Regularly audit third-party scripts and libraries to ensure no vulnerable components are included.
  4. Enhance accessibility features to improve compliance with standards and user experience for all visitors.
  5. Maintain and update privacy and compliance documentation to reflect evolving regulations and best practices.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
STIEBEL ELTRON GmbH & Co. KG
Description
Manufacturer of heat pumps, solar systems, electric hot water and heating products.
Key services
Heat pumps, Solar systems, Electric hot water, Heating products, Installer partner programs, Aftersales support
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, RequireJS, Modernizr, Piwik PRO analytics, Owl Carousel
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Cookie consent with opt-in/out
  • No exposed sensitive data in HTML
  • Secure forms with AJAX popups

Analytics and tracking

Services
Piwik PRO
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Piwik PRO
Marketing tools
Piwik PRO Tag Manager
Transparency
good

Site quality

Design
excellent
User experience
excellent
Content relevance
excellent
Navigation
excellent
Professionalism
excellent
Trustworthiness
high

Key observations

  1. Website is fully accessible with rich content and navigation.
  2. No WAF or blocking mechanisms detected.
  3. WHOIS data unavailable due to domain naming rules error.
  4. Strong privacy and cookie consent mechanisms implemented.
  5. Multiple language and regional versions linked.
  6. Professional branding and consistent design.
  7. Contact information and social media links clearly provided.
  8. No security.txt or explicit vulnerability disclosure found.
  9. No incident response or security contact information found.
  10. Use of Piwik PRO analytics with consent management.
Technical notes

Notes

The website is built on Adobe Experience Manager, a robust enterprise CMS, and uses modern JavaScript libraries such as RequireJS and Modernizr for modular loading and feature detection. The integration of Piwik PRO analytics indicates a focus on privacy-compliant data collection. The site uses responsive design techniques and preloads fonts and images for performance optimization. Navigation is clear with multi-level menus and AJAX-powered search autosuggest. Performance is moderate, with asynchronous script loading and lazy loading of images. There is room for improvement in accessibility and SEO metadata completeness. No hosting provider details were identified from the content. Overall, the technical infrastructure supports a professional and scalable web presence.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.

Retrieved 2026-10-25

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