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viessmann.co.uk

https://viessmann.co.uk· First analyzed 13 May 2026· Updated 13 May 2026
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viessmann.co.uk
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Mobile

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Hosting Provider

Viessmann IT Service GmbH

IP Address

93.122.86.52

Site Location

🇬🇧 United Kingdomvia tld

Server Location

🇩🇪 Brilon, Germany

ASN

AS48951

Organization

Viessmann IT Service GmbH

CDN

Fastly

Nameservers

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

Performance

98

Core Web Vitals

Weight

First Contentful Paint
893 ms10%
Speed Index
1.2 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.3 MB
51 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

6 Technologies Detected

CSS Frameworks

2
Bootstrap
Tailwind CSS

Analytics

2
Google Analytics
Google Analytics 4

Tag Managers

1
Google Tag Manager

Reviews

1
Trustpilot

SEO Analysis

A84/100
25
5
0
Meta Tags15/15
Content11/12
Headings8/8
Technical23/25
E-E-A-T0/7
Images5/7
Links2/5
URL5/5
Social4/5
Freshness4/4
Mobile4/4
Indexability3/3
V
viessmann.co.ukviessmann.co.uk

Combi Boilers, Heat Pumps & Heating Systems | Viessmann UK

Welcome to Viessmann UK, the world's leading manufacturer of high-efficiency heating and renewable energy systems. Get in touch today to get a quote.

Title Length58 chars

Recommended: 50-60 chars (~355px / 580px)

Description Length149 chars

Recommended: 120-160 chars

Issues (0)

    5 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    655 URLs

    robots.txt

    4 rules

    Sitemap reference found

    Allows all crawlers

    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

    D47/100
    Bot Access
    20/25
    Machine Read.
    11/25
    Schema Data
    1/25
    Citation
    15/25

    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
    nav
    Text ratio:6%
    Words:1,393
    Token eff.:Optimal
    Sections/1K:1.4
    Depth:1/5

    Structured Data

    1 JSON-LD
    BreadcrumbList

    Citation Readiness

    Opening Summary35w
    Descriptive Headingsavg 2.5w
    Canonical URL
    Open Graph3/3
    Twitter Card1/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (9)
    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
    87/100
    15
    Passed
    1
    Critical
    2
    Warnings
    Images & Alt Text
    20/20
    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
    13/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    7/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    1 recommendation
    • •Accessibility recommendation preview...
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    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.
    44/100
    C
    169 mg
    CO₂e / view
    1.3 MB
    Page Weight
    70%
    Cleaner Than
    New Visitor
    194 mg
    vs
    Returning (cached)
    97 mg
    Annual (10K/mo)
    20.3 kg
    Emission Segments
    Data Center
    38 mg
    Network
    41 mg
    Device
    91 mg
    Resource Breakdown
    JavaScript
    150.9 KB
    Images
    186.0 KB
    CSS
    106.9 KB
    Fonts
    213.5 KB
    HTML
    16.9 KB
    Other
    695.8 KB
    Green Hosting Not Verified
    Viessmann IT Service GmbH
    5 recommendations
    • •Carbon footprint recommendation preview...
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    A

    Security Score

    86%Very Good
    Interactive

    HTTPS

    No WAF

    45d

    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

    30.03.2026

    Valid Until

    28.06.2026

    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

    05:B2:F8:48:DD:19:4C:7B:1F:AF:67:78:22:DB:74:19:37:07:B7:8F...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    accept-ranges
    bytes
    cache-control
    🟡 7 Hours(max-age=28424)
    content-encoding
    📦 Gzip(gzip)
    content-length
    17043
    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)

    alt4.aspmx.l.google.com
    alt1.aspmx.l.google.com
    alt3.aspmx.l.google.com
    aspmx.l.google.com

    +1 more

    Domain Information

    viessmann.co.uk

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Usercentrics

    Cookie Consent Banner
    Usercentrics
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    CMP: Usercentrics
    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.
    B
    72/100
    Mobile Friendly
    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
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Viessmann Web

    WCAG AA
    81/100
    Readability
    /30
    21/30

    16px · LH 1.63

    Hierarchy
    /20
    20/20

    3.5x ratio · ✓ H1→H6

    WCAG
    /25
    22/25

    4.86:1 min contrast

    Performance
    /25
    18/25

    1 font · 5 req

    Heading Font

    Viessmann Web

    Sans56px

    Body Font

    Viessmann Web

    Sans16px

    Contrast Ratio

    4.86:1

    WCAG AA (≥4.5:1)

    Reading Comfort

    ~33 CPL

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

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

    ⚠️ Hard to read: Flesch score 36/100. Simplify sentences for wider reach.

    ✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 4.9:1).

    ✅ 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.

    Buy on MyFontsFlesch 37

    Color Palette

    5 unique colors
    15.58:1 AAA Dark
    #252227
    Text· 32.900000000000006%
    #fefefe
    Primary· 11.7%
    #0c0d0f
    Secondary· 35.8%
    #6f5857
    Secondary· 2.7%

    Business & Marketing Stack

    4 Tools Detected

    Enterprise

    Behavior Analytics

    2
    Google Tag ManagerFree
    Google AnalyticsFree

    User behavior and product analytics

    A/B Testing & Optimization

    1
    KameleoonEnterprise

    Experimentation and conversion optimization

    Reviews & Social Proof

    1
    TrustpilotMid-Market

    Customer reviews and testimonials

    3

    Categories

    4

    Total Tools

    1

    Enterprise

    1

    Mid-Market

    Assessment: Sophisticated marketing and sales technology infrastructure

    Sponsored

    Scripts & Styles

    15 Resources

    14
    Scripts
    1
    Styles
    6
    Async
    2
    Defer

    Top Script Sources

    t.viessmann.co.uk(4)local(3)app.usercentrics.eu(2)widget.trustpilot.com(2)googletagmanager.com(1)

    Website Identity

    viessmann.co.uk

    Location detected: 🇬🇧 United Kingdomvia tld
    📧 Google Workspaceen-GB

    Sponsored

    Last analyzed: 13 May 2026 at 17:56

    Historical Analysis & Change Tracking