heizung.de

https://heizung.de· First analyzed 19 May 2026· Updated 19 May 2026

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heizung.de

Mobile

Sponsored

Hosting Provider

Carrier Corporation

IP Address

161.145.150.12

Site Location

🇩🇪 Germanyvia tld

Server Location

🇺🇸 Palm Beach Gardens, United States

ASN

AS399678

Organization

Carrier Corporation

CDN

Fastly

Nameservers

tricia.ns.cloudflare.com.gabe.ns.cloudflare.com.

Performance

Core Web Vitals

Weight

First Contentful Paint

891 ms10%

Speed Index

1.2 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

376 KB

44 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Adobe Experience Manager

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

4 Technologies Detected

Analytics

CSS Frameworks

Tag Managers

SEO Analysis

A81/100

Meta Tags15/15

Content11/12

Headings8/8

Technical23/25

E-E-A-T0/7

Images2/7

Links2/5

URL5/5

Social4/5

Freshness4/4

Mobile4/4

Indexability3/3

heizung.deheizung.de

Heizung & Technik erklärt – So heizen Sie effizient

Heizung.de beantwortet Ihre Fragen rund um die Themen Heizung, Heizen und Energie. Wir finden jetzt Ihren passenden Installateur vor Ort!

Title Length51 chars

Recommended: 50-60 chars (~300px / 580px)

Description Length137 chars

Recommended: 120-160 chars

Issues (1)

• Most images missing alt text (1/1) — critical for accessibility and SEO

6 issues found

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Crawlability

Sitemap

Type: standard

1,652 URLs

robots.txt

4 rules

Sitemap reference found

Allows all crawlers

Local SEO

Local Search Readiness

8/100

Poor

2 13 2

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

Sponsored

AI & LLM Readiness

D40/100

Bot Access

20/25

Machine Read.

8/25

Schema Data

1/25

Citation

11/25

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:7%

Words:2,554

Token eff.:Optimal

Sections/1K:10.2

Depth:1/5

Structured Data

1 JSON-LD

BreadcrumbList

Citation Readiness

Opening Summary

Descriptive Headingsavg 2.9w

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...

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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.

60/100

Passed

Critical

Warnings

Images & Alt Text

5/20

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

Semantic Structure

17/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

10/15

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

9/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

4/15

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

4 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.

55/100

47 mg

CO₂e / view

376.1 KB

Page Weight

90%

Cleaner Than

New Visitor

53 mg

Returning (cached)

27 mg

Annual (10K/mo)

5.6 kg

Emission Segments

Data Center

10 mg

Network

11 mg

Device

25 mg

Resource Breakdown

JavaScript

75.7 KB

Images

199.4 KB

CSS

68.4 KB

HTML

27.2 KB

Other

5.4 KB

Green Hosting Not Verified

Carrier Corporation

4 recommendations

•Carbon footprint recommendation preview...

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Security Score

86%Very Good

Interactive

HTTPS

No WAF

40d

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

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HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🔵 1 Days(max-age=86400)

content-encoding

📦 Gzip(gzip)

content-length

27575

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

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (5)

alt4.aspmx.l.google.com

alt3.aspmx.l.google.com

alt2.aspmx.l.google.com

alt1.aspmx.l.google.com

+1 more

Domain Information

heizung.de

Last Updated

03.02.2026

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.

74/100

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...

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Typography & Readability

Roboto

WCAG Partial

73/100

Readability

/30

22/30

15px · LH 1.60

Hierarchy

/20

14/20

1.33x ratio · ✓ H1→H6

WCAG

/25

17/25

1.08:1 min contrast

Performance

/25

20/25

System fonts

Heading Font

Roboto

Sans20px

Body Font

Roboto

Sans15px

Contrast Ratio

1.08:1

8 issues

Reading Comfort

~38 CPL

Narrow lines

20px

36px

24px

15px

Major Third

Scale

⚠️ Small text: 15px may strain on mobile. Use ≥16px for WCAG compliance.

✅ Optimal line spacing: 1.60 ratio (ideal range 1.4–1.6).

❌ Very complex text: Flesch score 26/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 8 elements below WCAG AA threshold (min 1.1:1).

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

⚠️ Weak hierarchy: Headlines should be ≥2x body size for clear visual structure.

Flesch 26

Color Palette

10 unique colors

9.6:1 AAA Light

#f0f0f0

Background· 22%

#3d3d36

Text· 6.5%

#ffffff

Primary· 0%

#1e1a14

Secondary· 16.3%

#6a5740

Secondary· 10.2%

#a59c8b

Secondary· 6.8%

#060503

Primary· 6.4%

#766d5b

Secondary· 3.9%

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

A/B Testing & Optimization

KameleoonEnterprise

Experimentation and conversion optimization

Sponsored

Scripts & Styles

10 Resources

Scripts

Styles

Async

Defer

Top Script Sources

t.heizung.de(3)local(2)app.usercentrics.eu(2)googletagmanager.com(1)e6jczs172v.kameleoon.eu(1)

Website Identity

heizung.de

Location detected: 🇩🇪 Germanyvia tld

📧 Google Workspacede-DE

Social Profiles

YouTube

Sponsored

Last analyzed: 19 May 2026 at 07:04

Historical Analysis & Change Tracking