How does PageSourceSearch know what heizung.de is built with?

From the site's own source code. The crawler stores the exact bytes of its pages and first-party scripts; the libraries are recognised by fingerprinting that code against known releases, the identifiers are read out of the tag snippets, and the third-party hosts are the script, iframe and stylesheet sources in the HTML and the absolute URLs inside the scripts. Nothing is inferred from headers or guessed.

How far back does the history of heizung.de go?

To the first crawl the timeline lists. Every crawl records what the site looked like; when a file's content changes, its earlier version stays viewable because the stored chunks are never deleted, only mapped. A crawl that finds a file unchanged adds no copy.

Can I see an older version of a script from heizung.de?

Yes. In the stored files list, every date under a file opens the version that was live at that crawl, with the same viewer as the current one. The raw bytes can be downloaded from there.

Which other websites use the same tracking IDs as heizung.de?

Each identifier links to its reverse lookup, the list of every site in the index whose source carries the same id: the sites one analytics property or tag manager container is shared across.

Site profile

heizung.de

Built with @numbersprotocol/capture-eye 1.11.1, @googlemaps/markerclustererplus 1.2.10, leaflet-geosearch 4.4.0, @adobe/helix-rum-js 2.17.0. 5 pages and 154 stored files, last crawled 2026-10-02.

rank 1,135,899 4 libraries 0 identifiers 6 third-party hosts 1 crawl open the site

Technologies and libraries

Recognised by fingerprinting the stored files and bundles against known releases; a version is the release the bytes match.

Library	Version	Seen
@numbersprotocol/capture-eye	1.11.1	2026-10-02
@googlemaps/markerclustererplus	1.2.10	2026-10-02
leaflet-geosearch	4.4.0	2026-10-02
@adobe/helix-rum-js	2.17.0	2026-10-02

Tracking, tag and verification IDs

No analytics property, tag manager container, pixel or site-verification token was found in the stored source.

Third-party hosts

Hosts outside heizung.de that its pages load scripts, frames or stylesheets from, and that its own scripts name in absolute URLs (connect). Each links to every site loading from the same host.

Host	Loaded as	Found in
imp.viessmann-climatesolutions.com	connect	view source
maps.googleapis.com	connect	view source
web.cmp.usercentrics.eu	script	view source
www.googletagmanager.com	iframe	view source
www.w3.org	connect	view source
www.youtube.com	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 154) }. Versions are the crawls at which the file was new or its content changed; each opens the file as it was then, rebuilt from the same stored chunks.

File	Kind	Size	Collected	Versions
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https://www.heizung.de/etc.clientlibs/viessmann-…/549.03da3a0fe948f2a22edf.js	js	364 B	2026-10-02	current
https://www.heizung.de/etc.clientlibs/viessmann-…/504.0b8e432b785a0ede25b2.js	js	343 B	2026-10-02	current
https://www.heizung.de/etc.clientlibs/viessmann-…/520.3fb5d5cf0a1e468d82bf.js	js	473 B	2026-10-02	current
https://www.heizung.de/etc.clientlibs/viessmann-…/439.d06d335225da87b102db.js	js	453 B	2026-10-02	current
https://www.heizung.de/etc.clientlibs/viessmann-…/401.f5910bef9dbadd77cdd6.js	js	575 B	2026-10-02	current
https://www.heizung.de/etc.clientlibs/viessmann-…/386.ead6a2f4200d94e1b90a.js	js	355 B	2026-10-02	current
https://www.heizung.de/etc.clientlibs/viessmann-…/360.2e31b0cab5ed7080b3c4.js	js	281 B	2026-10-02	current
https://www.heizung.de/etc.clientlibs/viessmann-…/269.a6a346e4baed3166c613.js	js	3.7 KB	2026-10-02	current
https://www.heizung.de/etc.clientlibs/viessmann-…/216.9d1c0ddcdac63102709e.js	js	596 B	2026-10-02	current
https://www.heizung.de/etc.clientlibs/viessmann-…/109.df6db77fbb0558cd0a4d.js	js	1.8 KB	2026-10-02	current
https://www.heizung.de/etc.clientlibs/viessmann-…/108.f8e1209e5bd8b4be87d2.js	js	507 B	2026-10-02	current
https://www.heizung.de/etc.clientlibs/viessmann-…/100.ee829d8deab0d71f7d57.js	js	315 B	2026-10-02	current
https://www.heizung.de/etc.clientlibs/viessmann-…48bee1267c33617349f44-lc.min.js	js	254.1 KB	2026-10-02	current
https://www.heizung.de/.rum/@adobe/helix-rum-js@%5E2/dist/micro.js	js library	843 B	2026-10-02	current
https://www.heizung.de/ratgeber/modernisierung.html	html	286 KB	2026-10-02	2026-10-02
https://www.heizung.de/heizungsarten.html	html	262.8 KB	2026-10-02	2026-10-02
https://www.heizung.de/ratgeber/smart-home/die-h…sind-die-vor-und-nachteile.html	html	275.7 KB	2026-10-02	2026-10-02
https://www.heizung.de/news.html	html	360.6 KB	2026-10-02	2026-10-02
https://www.heizung.de/	html	278 KB	2026-10-02	2026-10-02

Timeline

One entry per crawl, newest first, with what changed since the crawl before: libraries, identifiers, third-party hosts and files. Historical versions stay viewable because the stored chunks are shared between versions, never copied.

2026-10-02 first crawl

5 pages, 154 files, 1.8 MB; 4 libraries, 0 identifiers, 6 third-party hosts
4 libraries added
- @adobe/helix-rum-js 2.17.0
- leaflet-geosearch 4.4.0
- @numbersprotocol/capture-eye 1.11.1
- @googlemaps/markerclustererplus 1.2.10
6 third-party hosts added
154 files added

Questions about heizung.de

How does PageSourceSearch know what heizung.de is built with?: From the site's own source code. The crawler stores the exact bytes of its pages and first-party scripts; the libraries are recognised by fingerprinting that code against known releases, the identifiers are read out of the tag snippets, and the third-party hosts are the script, iframe and stylesheet sources in the HTML and the absolute URLs inside the scripts. Nothing is inferred from headers or guessed.
How far back does the history of heizung.de go?: To the first crawl the timeline lists. Every crawl records what the site looked like; when a file's content changes, its earlier version stays viewable because the stored chunks are never deleted, only mapped. A crawl that finds a file unchanged adds no copy.
Can I see an older version of a script from heizung.de?: Yes. In the stored files list, every date under a file opens the version that was live at that crawl, with the same viewer as the current one. The raw bytes can be downloaded from there.
Which other websites use the same tracking IDs as heizung.de?: Each identifier links to its reverse lookup, the list of every site in the index whose source carries the same id: the sites one analytics property or tag manager container is shared across.

Look up another site, browse sites by tracking ID, third-party host or technology. Site owners: see the crawler page for how stored pages are removed.