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Security report for vaillant.com

Vaillant Group International GmbH · Energy · N/a

Partial score · DNS & email only

62/100

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

Vaillant Group International GmbH operates a comprehensive website showcasing its leadership in heating, cooling, air conditioning, and renewable energy technologies. The company emphasizes its 150-year history and market leadership with a broad product portfolio including heat pumps, boilers, and smart home heating controls. The website is well-structured, professionally designed, and targets consumers and businesses interested in sustainable energy solutions. Technically, the site uses modern JavaScript libraries and consent management tools, ensuring a good user experience and moderate performance. Security posture is adequate with HTTPS and cookie consent mechanisms, but lacks explicit security policies and incident response information. The absence of WHOIS data for the domain reduces domain registration trust signals, though the website content and branding strongly support legitimacy. Overall, the site presents a professional and trustworthy digital presence with room for improvement in security transparency and technical optimizations.

Scanned

NIS2 and GDPR posture

GDPR outside view
53/ 100 · Medium
Checks completed
6of 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

3 findings rated critical or high. Fix these first.

  1. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • Critical

      Unable to retrieve SSL certificate

      Could not establish secure connection to retrieve certificate information

      What to do: Check if the server is accessible and SSL/TLS is properly configured

  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

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

Keep watching vaillant.com

This scan found 14 issues across 5 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

Daily monitoring

Recommended

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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
0
Email security
75
DNS health
80
Network security
100
GDPR outside view
53
Average
62

Not counted

  • Security headers: did not complete in this scan.
  • 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

Vaillant is positioned as a market leader in the energy sector, focusing on sustainable heating and cooling solutions. Its competitive advantages include a long heritage, extensive service network, and a wide product range tailored to various customer needs. The business model combines product manufacturing with service and support, targeting both residential and commercial customers globally. The company maintains a strong partnership ecosystem, linking to corporate and career sites. Growth indicators include emphasis on smart heating and eco-friendly technologies. The website content reflects a mature, enterprise-level organization with consistent branding and high professionalism.

Security posture

The website demonstrates a moderate security maturity level with HTTPS usage and cookie consent management. However, it lacks visible security headers, published security policies, incident response contacts, and vulnerability disclosure mechanisms. No exposed sensitive data or vulnerable libraries were detected. The absence of WHOIS data is a concern but may be due to privacy or registry restrictions rather than malicious intent. Compliance with GDPR is indicated by privacy and cookie policies. Overall, the security posture is adequate but could be enhanced by publishing explicit security documentation and improving header configurations.

Recommendations

  1. Implement and publish a dedicated security policy and incident response page to improve transparency.
  2. Add a vulnerability disclosure program or security.txt file to facilitate responsible reporting.
  3. Enhance HTTP security headers such as Content-Security-Policy, Strict-Transport-Security, and X-Frame-Options.
  4. Improve accessibility features to meet higher standards and broaden user inclusivity.
  5. Optimize website performance further to enhance user experience, especially on mobile devices.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Vaillant Group International GmbH
Description
Vaillant provides heating, cooling, air conditioning and renewable energy solutions with a focus on eco-friendly and future-proof technologies.
Key services
Heat pumps, Wall hung boilers, Air conditioning systems, Smart heating control solutions, Service and support network
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Google Tag Manager, ConsentManager.net, Swiper.js, Slick Carousel, Picturefill
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
70/100
Good practices seen
  • Use of HTTPS (implied by URLs)
  • Consent management for cookies

Analytics and tracking

Services
Google Tag Manager
Tracking level
moderate
Privacy practices
good

Advertising

Marketing tools
ConsentManager.net
Transparency
basic

Site quality

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

Key observations

  1. Website is fully accessible with rich content and navigation.
  2. No WHOIS data available, which is unusual for a commercial .com domain.
  3. Strong branding and market leader claims supported by detailed product and company information.
  4. Good privacy and cookie policy presence with consent management.
  5. No explicit security policy or incident response information found.
  6. No direct contact emails or phone numbers visible on homepage; contact form is primary contact method.
  7. Use of modern JavaScript libraries and tracking tools.
  8. No suspicious or malicious content detected.
  9. No adult or NSFW content present.
Technical notes

Notes

The website employs a modern JavaScript-based front-end with libraries such as Swiper.js and Slick Carousel for UI components, and Google Tag Manager for analytics. ConsentManager.net is used for cookie consent management, indicating compliance with privacy regulations. The site is mobile optimized with responsive design and uses picturefill for responsive images. No CMS or hosting provider details were detected. Performance is moderate with room for improvement. The absence of explicit security headers and limited accessibility features suggest technical debt in security and inclusivity areas. Overall, the technical infrastructure supports a professional and functional user experience but could benefit from modernization in security and accessibility.
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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