viessmann.de

Klimalösungen: Effizient heizen, kühlen, lüften

Last scanned Jul 27, 2026, 8:44 AM · 1 view

91

Overall score

Excellent

Summary

Heiz-, Kühl- und Lüftungstechnik, die Lebensräume gestaltet und das Klima schont. This website uses Google Analytics hosted on AKAMAI-ASN1 - Akamai International B.V., NL. SEO is excellent (95/100) and accessibility is excellent (100/100). Security scores excellent (90/100) and performance good (80/100). Top issue: sitemap.xml not found.

Heiz-, Kühl- und Lüftungstechnik, die Lebensräume gestaltet und das Klima schont. Entdecke ganzheitliche Lösungsangebote von Viessmann.

United States

Hosted on AKAMAI-ASN1 - Akamai International B.V., NL

Top issues to fix

4 issues found · 1 high priority

Slow estimated load (5.1s)
Performance
Use a CDN, enable caching/compression, and cut render-blocking assets — every extra second costs conversions.
Missing X-Frame-Options header
Security
Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
sitemap.xml not found
SEO
Publish an XML sitemap and reference it from robots.txt to speed up page discovery.
16 broken links on the page
SEO
Fix or remove broken links — they waste crawl budget and erode user trust.

95

SEO

1 issue(s) found

80

Performance

5.15 s

90

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

Company details published in this site's own structured data.

Heiz-, Kühl- und Lüftungstechnik, die Lebensräume gestaltet und das Klima schont. Entdecke ganzheitliche Lösungsangebote von Viessmann.

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Meta tags

Title: Klimalösungen: Effizient heizen, kühlen, lüften
Description: Heiz-, Kühl- und Lüftungstechnik, die Lebensräume gestaltet und das Klima schont. Entdecke ganzheitliche Lösungsangebote von Viessmann.
Canonical: https://www.viessmann.de/
Language: de-DE
Charset: UTF-8
Viewport: width=device-width, initial-scale=1
Robots meta
Manifest: https://www.viessmann.de/etc.clientlibs/viessmann-corporate/clientlibs/vic.app/resources/favicons/site.webmanifest

Technologies

Detected frameworks, languages, and tools.

Google Analytics

Hosting & CDN

Hosting provider: AKAMAI-ASN1 - Akamai International B.V., NL
CDN provider: —
IP address: 23.55.244.186
ASN: AS20940 (AKAMAI-ASN1 - Akamai International B.V., NL)

DNS records

Type	Value
A	23.55.244.186 23.55.244.162
AAAA	2600:140f:1e00::1737:f4c8 2600:140f:1e00::1737:f4f0
MX	—
TXT	—
NS	—
CAA	—
CNAME	viessmann.edgekey.net
IPv6 support	Yes

TLS / SSL certificate

Version: TLS 1.3
Issuer: Let's Encrypt
Subject: viessmann.de
Valid from: Jul 17, 2026
Valid to: Oct 15, 2026
Days until expiry: 79
SAN domains: aanbod.viessmann.be, aanbod.viessmann.nl, angebot.viessmann.at, angebot.viessmann.ch, angebote.viessmann.de, assets.viessmann-climatesolutions.com, campaign.viessmann.bg, connectivity.viessmann-climatesolutions.com, developer.viessmann-climatesolutions.com, home.viessmann-climatesolutions.com, legal-policies.viessmann-climatesolutions.com, live.viessmann-climatesolutions.com, oferta.viessmann.es, oferta.viessmann.ro, offer.viessmann.ca, offer.viessmann.co.uk, offert.viessmann.se, offre.viessmann.be, offre.viessmann.ch, offre.viessmann.fr, partnerportal.viessmann-climatesolutions.com, pasiulymas.viessmann.lt, ponuda.viessmann.hr, ponudba.viessmann.si, public-sample.viessmann.ca, supplierportal.viessmann-climatesolutions.com, tilbud.viessmann.dk, viessmann.de, webstorage.viessmann-climatesolutions.com, www.heizung-sorglos-mieten.de, www.heizung.de, www.photovoltaik-sorglos-mieten.de, www.pompe-a-chaleur-intelligente.be, www.schlaue-waermepumpe.at, www.schlaue-waermepumpe.com, www.schlaue-waermepumpe.de, www.slimme-warmtepomp.be, www.slimme-warmtepomp.nl, www.viessmann-climatesolutions.com, www.viessmann-kh.com, www.viessmann-us.com, www.viessmann.ae, www.viessmann.at, www.viessmann.be, www.viessmann.bg, www.viessmann.ca, www.viessmann.ch, www.viessmann.cn, www.viessmann.co.uk, www.viessmann.com.au, www.viessmann.com.tr, www.viessmann.com.vn, www.viessmann.cz, www.viessmann.de, www.viessmann.dk, www.viessmann.ee, www.viessmann.es, www.viessmann.fi, www.viessmann.fr, www.viessmann.hk, www.viessmann.hr, www.viessmann.hu, www.viessmann.id, www.viessmann.it, www.viessmann.lt, www.viessmann.lu, www.viessmann.lv, www.viessmann.nl, www.viessmann.no, www.viessmann.pl, www.viessmann.pt, www.viessmann.ro, www.viessmann.rs, www.viessmann.se, www.viessmann.si, www.viessmann.sk, www.viessmann.ua

Security headers

Strict-Transport-SecurityEnabled
Content-Security-PolicyEnabled
X-Frame-OptionsMissing
X-Content-Type-OptionsEnabled
Referrer-PolicyEnabled
Permissions-PolicyEnabled

Compression: gzip · 1 cookie(s) observed

Content & assets

Headings

H1 1 · H2 5 · H3 24

Links

161 internal · 23 external · 16 broken

Images

24 total · 4 missing alt

Scripts / Styles

32 scripts · 1 stylesheets

JS / CSS size

815 KB · 704 B

Page size

237 KB

Robots.txt & Sitemap

robots.txt: Found
Disallow rules: 0
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

sitemap.xml not found

Scan details

Requested URL: https://viessmann.de
Final URL: https://www.viessmann.de/
HTTP status: 200
HTTP version: HTTP/2
Response time: 5.14 s
HTML size: 237 KB
Redirect chain: https://viessmann.de → https://www.viessmann.de/

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Frequently asked questions

What technology does viessmann.de use?: viessmann.de is built with Google Analytics.
Is viessmann.de secure (HTTPS)?: Yes. viessmann.de uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 15, 2026.
Who hosts viessmann.de?: viessmann.de is hosted on AKAMAI-ASN1 - Akamai International B.V., NL.
What is viessmann.de's SEO score?: viessmann.de scored 95/100 for SEO in the latest analysis (excellent).
What is viessmann.de's overall website score?: viessmann.de has an overall SiteGraph score of 91/100, combining SEO, performance, security, and accessibility.