viessmann.com

https://viessmann.com· First analyzed 10 May 2026· Updated 10 May 2026

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viessmann.com

Mobile

Sponsored

Hosting Provider

Viessmann IT Service GmbH

IP Address

93.122.86.82

Site Location

🇩🇪 Germanyvia ip

Server Location

🇩🇪 Brilon, Germany

ASN

AS48951

Organization

Viessmann IT Service GmbH

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

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

Performance

Core Web Vitals

Weight

First Contentful Paint

740 ms10%

Speed Index

962 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

294 KB

25 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

JAMstack

⚡ SSG

Decoupled

Frontend

Framework

Astrov4.16.18

API

Data Source

Headless CMS

Storyblok

Infrastructure

Hosting

Viessmann IT Service GmbH

CDN

Cloudflare

Detected API Sources

https://app.storyblok.com/f/st...https://a.storyblok.com/f/3373...

Technology Stack

5 Technologies Detected

Analytics

Meta Frameworks

CSS Frameworks

CDN

SEO Analysis

D52/100

Meta Tags9/15

Content2/12

Headings3/8

Technical17/25

E-E-A-T0/7

Images2/7

Links5/5

URL5/5

Social3/5

Freshness0/4

Mobile3/4

Indexability3/3

viessmann.comviessmann.com

Home | Viessmann.com

Erfahren Sie hier mehr über die Viessmann Generations Group und Viessmann Climate Solutions inklusive weiterführender Links zu den Webseiten.

Title Length20 chars

Recommended: 50-60 chars (~125px / 580px)

Description Length141 chars

Recommended: 120-160 chars

Issues (3)

• Very thin content (3 words). Search engines need substantial content for ranking.
• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (12/12) — critical for accessibility and SEO

9 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

2 rules

Local SEO

Local Search Readiness

7/100

Poor

2 14 2

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

Sponsored

AI & LLM Readiness

F10/100

Bot Access

3/25

Machine Read.

1/25

Schema Data

0/25

Citation

6/25

AI Bot Access

0/14 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:1%

Words:156

Token eff.:Too Short

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headings

Canonical URL

Open Graph2/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

AI readiness recommendation preview...

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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.

65/100

Passed

Critical

Warnings

Images & Alt Text

5/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

13/20

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

6/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

3 recommendations

•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.

57/100

A+

36 mg

CO₂e / view

293.5 KB

Page Weight

90%

Cleaner Than

New Visitor

42 mg

Returning (cached)

21 mg

Annual (10K/mo)

4.4 kg

Emission Segments

Data Center

8 mg

Network

9 mg

Device

20 mg

Resource Breakdown

JavaScript

13.5 KB

Images

1.2 KB

CSS

251.6 KB

HTML

3.0 KB

Other

24.2 KB

Green Hosting Not Verified

Viessmann IT Service GmbH

4 recommendations

•Carbon footprint recommendation preview...

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Security Score

71%Good

Static / Informational

HTTPS

WAF

54d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

05.04.2026

Valid Until

04.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

www.viessmann.com

SHA-256 Fingerprint

09:A1:6D:17:E3:67:53:00:F5:38:32:0E:33:71:D2:C6:1A:0E:B5:3D...

Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

age

2027504

alt-svc

h3=":443"; ma=86400

cache-control

🔵 1 Days(max-age=86400)

cf-cache-status

HIT

cf-ray🇦🇹 Vienna

9f9aa8f66b53c026-VIE

content-encoding

⚡ Brotli(br)

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (5)

alt1.aspmx.l.google.com

alt2.aspmx.l.google.com

alt4.aspmx.l.google.com

alt3.aspmx.l.google.com

+1 more

Domain Information

viessmann.com

Domain Age

29y 6m

Created

11.11.1996

Expires

10.11.2027

Last Updated

12.01.2026

Registrar

InterNetX GmbH

DNSSEC

Not Enabled

Privacy & Compliance

Usercentrics

Cookie Consent Banner

Usercentrics

GDPR Indicators

Cookie consent banner detected

CMP: Usercentrics

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.

72/100

Mobile Friendly40 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

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Inter

WCAG Partial

65/100

Readability

/30

17/30

16px · LH --

Hierarchy

/20

8/20

WCAG

/25

20/25

3.53:1 min contrast

Performance

/25

20/25

1 font · 2 req

Heading Font

Inter

Sans

Body Font

Inter

Sans16px

Contrast Ratio

3.53:1

2 issues

Reading Comfort

~31 CPL

Narrow lines

28px

16px

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

❌ Very complex text: Flesch score 19/100. Consider shorter sentences and simpler words.

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

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

✅ Modern fluid typography: clamp() with rem units ensures zoom accessibility (WCAG 1.4.4).

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

Buy on MyFontsFluid Type (rem)Flesch 19

Color Palette

6 unique colors

7.45:1 AAA Light

#f6f6f6

Background· 59%

#505051

Other· 14.6%

#dad1d2

Primary· 7.9%

#803b2f

Secondary· 3.4%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

8 Resources

Scripts

Styles

Async

Defer

Top Script Sources

app.usercentrics.eu(2)local(2)googletagmanager.com(1)app.storyblok.com(1)

Website Identity

viessmann.com

29 years old

Location detected: 🇩🇪 Germanyvia ip

InterNetX GmbH📧 Google Workspacede

Sponsored

Last analyzed: 10 May 2026 at 17:28

Historical Analysis & Change Tracking