StackOptic
Back to Search
viessmann.fr favicon

viessmann.fr

https://viessmann.fr· First analyzed 24 May 2026· Updated 24 May 2026
Export
viessmann.fr
Desktop screenshot of viessmann.fr
Mobile screenshot of viessmann.fr
Mobile

Sponsored

Hosting Provider

Viessmann IT Service GmbH

IP Address

93.122.86.52

Site Location

🇫🇷 Francevia tld

Server Location

🇩🇪 Brilon, Germany

ASN

AS48951

Organization

Viessmann IT Service GmbH

CDN

Fastly

Nameservers

c.ns14.net.b.ns14.net.a.ns14.net.d.ns14.net.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
631 ms10%
Speed Index
820 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
4.9 MB
56 requests

Image Optimization

Lazy LoadResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Bootstrap
CMS
Adobe Experience Manager
Infrastructure
Hosting
Viessmann IT Service GmbH
CDN
Fastly

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

7 Technologies Detected

CSS Frameworks

2
Bootstrap
Tailwind CSS

Analytics

2
Google Analytics
Google Analytics 4

Fonts

1
Google Fonts

Tag Managers

1
Google Tag Manager

Reviews

1
Trustpilot

SEO Analysis

B79/100
23
8
0
Meta Tags14/15
Content10/12
Headings8/8
Technical23/25
E-E-A-T0/7
Images3/7
Links2/5
URL5/5
Social4/5
Freshness4/4
Mobile3/4
Indexability3/3
V
viessmann.frviessmann.fr

Pompes à chaleur et installations de chauffage économiques

Viessmann Climate Solutions crée des solutions climatiques et énergétiques efficaces et durables pour le chauffage, l'eau et la qualité de l'air, assurant ai...

Description truncated.
Title Length58 chars

Recommended: 50-60 chars (~352px / 580px)

Description Length198 chars

Recommended: 120-160 chars

Issues (0)

    8 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    615 URLs

    robots.txt

    6 rules

    Sitemap reference found

    Local SEO

    Local Search Readiness

    18/100
    Poor
    5 11 2

    This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

    Sponsored

    AI & LLM Readiness

    D42/100
    Bot Access
    20/25
    Machine Read.
    7/25
    Schema Data
    1/25
    Citation
    14/25

    AI Bot Access

    14/14 accessible
    AI Search
    OAI-SearchBot
    PerplexityBot
    Claude-SearchBot
    Gemini-Deep-Research
    DuckAssistBot
    Training
    GPTBot
    ClaudeBot
    Google-Extended
    Meta-ExternalAgent
    Bytespiderinfo
    Amazonbot
    Applebot-Extended
    CCBotinfo
    Fetch
    ChatGPT-User

    Machine Readability

    llms.txt
    llms-full.txt
    Semantic HTML
    Heading Hierarchy
    Text ratio:3%
    Words:1,346
    Token eff.:Optimal

    Structured Data

    1 JSON-LD
    BreadcrumbList

    Citation Readiness

    Opening Summary328w
    Descriptive Headingsavg 9.5w
    Canonical URL
    Open Graph2/3
    Twitter Card1/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (11)
    AI readiness recommendation preview...
    Upgrade to view recommendations

    Sponsored

    Accessibility

    WCAG 2.1 Compliance

    Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
    A
    82/100
    14
    Passed
    3
    Critical
    1
    Warnings
    Images & Alt Text
    15/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    17/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    15/15
    Verifies form fields have labels, error messages are clear, and inputs are properly associated.
    Color & Contrast
    15/15
    Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
    Keyboard & Focus
    11/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    9/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    3 recommendations
    • •Accessibility recommendation preview...
    Upgrade to view recommendations

    Carbon Footprint

    SWDM v4 · Eco-Score

    Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
    25/100
    F
    623 mg
    CO₂e / view
    4.9 MB
    Page Weight
    15%
    Cleaner Than
    New Visitor
    712 mg
    vs
    Returning (cached)
    356 mg
    Annual (10K/mo)
    74.8 kg
    Emission Segments
    Data Center
    139 mg
    Network
    150 mg
    Device
    334 mg
    Resource Breakdown
    JavaScript
    154.8 KB
    Images
    3.0 KB
    CSS
    107.7 KB
    Fonts
    215.4 KB
    HTML
    17.0 KB
    Other
    4.4 MB
    Green Hosting Not Verified
    Viessmann IT Service GmbH
    7 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    A

    Security Score

    86%Very Good
    Interactive

    HTTPS

    No WAF

    87d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2

    Valid From

    22.05.2026

    Valid Until

    20.08.2026

    Subject Alternative Names (20)

    aanbod.viessmann.beaanbod.viessmann.nlangebot.viessmann.atangebot.viessmann.changebote.viessmann.deassets.viessmann-climatesolutions.comcampaign.viessmann.bgconnectivity.viessmann-climatesolutions.com+12 more

    SHA-256 Fingerprint

    E5:BF:3B:BF:6F:A2:E3:C6:CB:0B:91:5F:CA:A5:63:83:C4:1F:A7:72...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    accept-ranges
    bytes
    cache-control
    🟡 6 Hours(max-age=24386)
    content-encoding
    📦 Gzip(gzip)
    content-length
    17116
    content-security-policy
    default-src 'unsafe-inline' 'unsafe-eval' data: blob: *;
    content-type
    text/html;charset=utf-8
    Good Warning Issue

    Email Infrastructure

    Google Workspace

    Score

    70

    SPF
    DKIM
    DMARC

    DMARC Policy

    None (Monitor Only)

    MX Records (5)

    alt3.aspmx.l.google.com
    alt2.aspmx.l.google.com
    alt1.aspmx.l.google.com
    aspmx.l.google.com

    +1 more

    Domain Information

    viessmann.fr

    Domain Age
    28y 11m

    Created

    29.06.1997

    Expires

    21.03.2027

    Last Updated

    30.04.2026

    Registrar

    InterNetX GmbH

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookiebot

    Cookie Consent Banner
    Cookiebot
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    CMP: Cookiebot
    Privacy policy page linked

    Mobile Compatibility

    Viewport & Responsive Test

    Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
    A
    89/100
    Mobile Friendly7 breakpoints
    Viewport Meta
    The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
    Responsive Design
    Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
    Touch Icons
    Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
    Readable Font Size
    Base font size should be at least 16px on mobile to ensure text is readable without zooming.
    Relative Units
    Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
    No H-Scroll Risk
    No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
    Tap Targets OK
    Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
    No Fixed Widths
    No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
    Viewport
    width=device-width, initial-scale=1
    1 recommendation
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Viessmann Web

    WCAG Partial
    78/100
    Readability
    /30
    21/30

    16px · LH 1.63

    Hierarchy
    /20
    20/20

    3.5x ratio · ✓ H1→H6

    WCAG
    /25
    19/25

    3.49:1 min contrast

    Performance
    /25
    18/25

    1 font · 6 req

    Heading Font

    Viessmann Web

    Sans56px

    Body Font

    Viessmann Web

    Sans16px

    Contrast Ratio

    3.49:1

    2 issues

    Reading Comfort

    ~33 CPL

    Narrow lines
    56px
    h1
    40px
    h2
    32px
    h3
    20px
    h4
    16px
    p

    ✅ Excellent readability: 16px body text is ideal for all devices.

    ⚠️ Hard to read: Flesch score 37/100. Simplify sentences for wider reach.

    ⚠️ Partial contrast: 2 elements below WCAG AA threshold (min 3.5:1).

    ✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

    ✅ Strong hierarchy: Headlines are 3.5x larger than body text.

    ✅ Lean font stack: 1 font families keeps load times fast.

    GGoogle FontsBuy on MyFontsFlesch 37

    Color Palette

    7 unique colors
    20.87:1 AAA Dark
    #010101
    Text· 62.800000000000004%
    #ffffff
    Primary· 12.299999999999999%
    #0b0f12
    Secondary· 9.9%
    #cd2c08
    Primary· 8.1%
    #ae6958
    Secondary· 2%
    #631c0e
    Accent· 0.4%

    Business & Marketing Stack

    4 Tools Detected

    Advanced

    Behavior Analytics

    2
    Google Tag ManagerFree
    Google AnalyticsFree

    User behavior and product analytics

    Privacy & Cookies

    1
    CookiebotMid-Market

    Cookie consent and privacy compliance tools

    Reviews & Social Proof

    1
    TrustpilotMid-Market

    Customer reviews and testimonials

    3

    Categories

    4

    Total Tools

    0

    Enterprise

    2

    Mid-Market

    Assessment: Well-developed marketing technology stack

    Sponsored

    Scripts & Styles

    17 Resources

    15
    Scripts
    2
    Styles
    7
    Async
    3
    Defer

    Top Script Sources

    t.viessmann.fr(4)local(2)app.usercentrics.eu(2)plugins.flockler.com(2)googletagmanager.com(1)

    Website Identity

    viessmann.fr

    28 years old
    Location detected: 🇫🇷 Francevia tld
    InterNetX GmbH📧 Google Workspacefr-FR

    Sponsored

    Last analyzed: 24 May 2026 at 10:49

    Historical Analysis & Change Tracking