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vaillant.at website review

Visit site (opens in a new tab)Reviewed 23 October 202617 issues · 77 checks

This review found 17 issues worth fixing on vaillant.at, 5 of them high impact, across 77 checks. The most urgent: interactive controls must not be nested (9 elements). Your full playbook turns these into prioritised fixes alongside reviews, competitors and channels.

  1. Homepage
  2. Phone render
  3. Links and pages
  4. Google PageSpeed

Google PageSpeed Insights (opens in a new tab), mobile

Site score

88B

Closest competitors among reviewed websites

Compare side by side
Real-visitor load time (LCP)75th percentile, phones
1.5 s1.2 sMay 2Oct 171.4 s
Show as table
DateReal-visitor load time (LCP)
May 2, 20261.4 s
May 9, 20261.5 s
May 16, 20261.5 s
May 23, 20261.5 s
May 30, 20261.5 s
Jun 6, 20261.5 s
Jun 13, 20261.5 s
Jun 20, 20261.4 s
Jun 27, 20261.3 s
Jul 4, 20261.3 s
Jul 11, 20261.2 s
Jul 18, 20261.3 s
Jul 25, 20261.3 s
Aug 1, 20261.3 s
Aug 8, 20261.3 s
Aug 15, 20261.3 s
Aug 22, 20261.3 s
Aug 29, 20261.3 s
Sep 5, 20261.3 s
Sep 12, 20261.4 s
Sep 19, 20261.4 s
Sep 26, 20261.4 s
Oct 3, 20261.4 s
Oct 10, 20261.4 s
Oct 17, 20261.4 s
Real-visitor tap response (INP)75th percentile, phones
561 ms61 msMay 2Oct 17144 ms
Show as table
DateReal-visitor tap response (INP)
May 2, 2026503 ms
May 9, 2026503 ms
May 16, 2026499 ms
May 23, 2026492 ms
May 30, 2026496 ms
Jun 6, 2026487 ms
Jun 13, 2026501 ms
Jun 20, 2026495 ms
Jun 27, 2026458 ms
Jul 4, 2026454 ms
Jul 11, 2026463 ms
Jul 18, 2026471 ms
Jul 25, 2026461 ms
Aug 1, 2026322 ms
Aug 8, 2026186 ms
Aug 15, 2026132 ms
Aug 22, 2026119 ms
Aug 29, 2026129 ms
Sep 5, 2026139 ms
Sep 12, 2026144 ms
Sep 19, 2026139 ms
Sep 26, 2026140 ms
Oct 3, 2026141 ms
Oct 10, 2026137 ms
Oct 17, 2026144 ms

Chrome UX Report (opens in a new tab): real Chrome visitors over rolling 28-day periods.

One score from every part of this review. How it works

www.vaillant.at (opens in a new tab)
Full-page screenshot of vaillant.at (desktop) rendered by Google PageSpeed Insights

How it loaded on a phone

  1. vaillant.at at 0.4 s0.4 s
  2. vaillant.at at 0.9 s0.9 s
  3. vaillant.at at 1.3 s1.3 s
  4. vaillant.at at 1.7 s1.7 s
  5. vaillant.at at 2.2 s2.2 s
  6. vaillant.at at 2.6 s2.6 s
  7. vaillant.at at 3.0 s3.0 s
  8. vaillant.at at 3.4 s3.4 s

Speed

1 to fix96

  • Render-blocking requests

    300 ms

    1 file blocks the first paint until they finish downloading. Deferring or inlining it could save about 300 ms.

  • Reduce unused JavaScript

    182 KiB

    About 182 KiB of JavaScript is downloaded but never used on this page.

  • 3 long tasks on the main thread

    3 long tasks block the main thread while loading, the longest for 167 ms. During a long task the page ignores taps.

  • 1 third-party service on the page

    1 third-party service load with your homepage (consentmanager.net), adding 134 KiB and 149 ms of main-thread time.

  • Use efficient cache lifetimes

    55 KiB

    3 files are served with short cache lifetimes, so returning visitors download them again (55 KiB).

  • Improve image delivery

    47 KiB

    3 images could be 47 KiB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen.

  • Legacy JavaScript

    13 KiB

    Polyfills for old browsers add 13 KiB JavaScript that modern phones do not need.

  • Reduce unused CSS

    11 KiB

    About 11 KiB of CSS is downloaded but never applied on this page.

  • Chained critical requests

    Critical files load one after another instead of in parallel (3 chains). Preconnecting to key origins and preloading the hero image shortens the chain.

  • Forced reflow

    Scripts make the browser recalculate the layout repeatedly while the page loads, which wastes processor time on phones.

  • Minify CSS

    2 KiB

    2 KiB could be saved by minifying CSS.

3 checks passed

  • Mobile performance score: 96

    96/100

    Your mobile performance score is 96 (desktop: 87). That is in Google's “good” band (90 and up).

  • Main-thread work: 1.2 s

    A phone's processor spends 1.2 s on main-thread work while loading, 642 ms of it running JavaScript. That is comfortably low.

  • Server response: 104 ms

    104 ms

    Your server sent the HTML in 104 ms, well inside Google's 600 ms guideline.

Core Web Vitals

2 to fix100

  • Time to Interactive: 6.9 s

    6.9 s

    The page becomes fully interactive after 6.9 s. Good is under 3.8 s.

  • Speed Index: 3.8 s

    3.8 s

    Visually, the page fills in at 3.8 s (Speed Index). Good is under 3.4 s.

  • Largest content (LCP) held steady for real visitors

    -3%

    Over the last 25 four-week periods to 2026-10-17, real Chrome visitors' largest content (lcp) went from 1.4 s to 1.4 s at the 75th percentile (Chrome UX Report (opens in a new tab) history).

11 checks passed

  • Passes Core Web Vitals for real visitors

    Real Chrome users on phones pass Google's Core Web Vitals on this page (28-day field data from the Chrome UX Report (opens in a new tab)).

  • Real-user LCP: 1.2 s

    1.2 s

    Real visitors wait 1.2 s for the largest content to appear (75th percentile). Good is under 2.5 s.

  • Real-user INP: 199 ms

    199 ms

    Real visitors wait 199 ms for the page to respond to a tap (75th percentile). Good is under 200 ms.

  • Real-user CLS: 0.01

    0.01

    For real visitors the layout shifts by 0.01 (75th percentile). Good is under 0.1.

  • Real-user FCP: 1.1 s

    1.1 s

    Real visitors see the first content after 1.1 s (75th percentile). Good is under 1.8 s.

  • Real-user TTFB: 456 ms

    456 ms

    Real visitors wait 456 ms for your server to start answering (75th percentile). Good is under 800 ms.

  • Tap response (INP) got 72% faster for real visitors

    -72%

    Over the last 25 four-week periods to 2026-10-17, real Chrome visitors' tap response (inp) went from 503 ms to 144 ms at the 75th percentile (Chrome UX Report (opens in a new tab) history).

  • Total Blocking Time: 148 ms

    148 ms

    Scripts block the page for only 148 ms while loading. Good is under 200 ms.

  • Largest Contentful Paint: 2.0 s

    2.0 s

    Your largest element renders in 2.0 s on a phone, inside Google's 2.5 s “good” threshold. The largest element is the image “Drei Wärmepumpen”.

  • First Contentful Paint: 1.1 s

    1.1 s

    The first text or image appears after 1.1 s, inside the 1.8 s “good” threshold.

  • Cumulative Layout Shift: 0.001

    0.001

    The layout barely moves while loading (CLS 0.001, good is under 0.1).

Images and page weight

100

  • About 0.5 g of CO₂ per visit

    0.53 g

    By the Sustainable Web Design model, a visit to your homepage emits about 0.53 g of CO₂e: 63.9 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

4 checks passed

  • Page weight: 1.9 MB in 72 requests

    1.9 MB

    Your homepage downloads 1.9 MB in 72 requests on a phone: images 877 KiB (24), scripts 663 KiB (31) and other files 188 KiB (9). That is a lean page.

  • Images use modern formats

    Every sizeable image is WebP, AVIF or SVG.

  • Images load when needed

    Images below the first screen wait until the visitor scrolls to them.

  • Images are sized for phones

    No image is downloaded at more than three times the size it is drawn on a phone.

Accessibility

4 to fixGoogle 9793

  • Interactive controls must not be nested (9 elements)

    Interactive controls must not be nested: 9 elements on the page fail this check, rated serious by axe-core.

  • 7 text elements with low contrast

    7 text elements don't have enough contrast against the background to read easily, especially outdoors on a phone.

  • Scrollable region must have keyboard access (1 element)

    Scrollable region must have keyboard access: 1 element on the page fails this check, rated serious by axe-core.

  • Landmarks should have a unique role or role/label/title (i.e. accessible name) combination (1 element)

    Landmarks should have a unique role or role/label/title (i.e. accessible name) combination: 1 element on the page fails this check, rated moderate by axe-core.

2 checks passed

  • Every image has alt text

    All 28 images in the HTML carry an alt attribute.

  • 46 automated accessibility rules passed

    axe-core 4.13.0, the open-source engine behind most accessibility testing tools, ran 50 WCAG 2.2 A/AA and best-practice rules on the phone render: 46 passed and 4 failed. 1 more need a person to judge. Automated rules catch about a third of accessibility problems; the rest need manual testing.

SEO

3 to fixGoogle 10088

  • No structured data

    No structured data (JSON-LD), so Google can't show rich results such as your logo, ratings or FAQs.

  • Meta description is long (189 characters)

    Your meta description is 189 characters; Google truncates after about 160, so the end of your pitch is cut.

  • No social preview image

    No Open Graph image (also missing: og:title, og:description), so links shared on LinkedIn, Slack or Facebook show no preview picture.

  • No X (Twitter) card tag

    No twitter:card tag. X falls back to Open Graph, which is incomplete here.

  • 144 internal links, 10 external

    The homepage links to 144 pages on vaillant.at and 10 external pages.

5 checks passed

  • One H1 headline

    Your main headline reads: “Die ersten Wärmepumpen, die einfach überall stehen können.”.

  • Title: 54 characters

    Your title is a healthy 54 characters: “Wärmepumpen und andere Heizungen | Vaillant Österreich”.

  • Canonical URL set

    The canonical URL is https://www.vaillant.at/.

  • robots.txt in place

    robots.txt is in place and points crawlers to your sitemap.

  • XML sitemap found

    Your XML sitemap is reachable at https://www.vaillant.at/sitemap.xml.

AI search readiness

1 to fix88

  • No Organization structured data

    There is no Organization (or LocalBusiness) JSON-LD, so search engines and AI assistants have no machine-readable facts about who runs the site: its name, logo, profiles and contact details.

  • No llms.txt

    There is no https://www.vaillant.at/llms.txt, a short Markdown guide to your key pages for AI tools (llmstxt.org). It is optional and few AI tools read it yet, so treat it as a cheap extra.

2 checks passed

  • AI answer engines may read the site

    Your robots.txt lets the crawlers behind ChatGPT search, Claude and Perplexity read the site and cite it in answers.

  • Text is in the HTML

    Your server sends the page's text in the HTML (1,048 words), so crawlers that don't run JavaScript still read it.

Other pages

100

  • 15 internal pages checked

    We fetched 15 pages linked from your homepage (of 91 found) and read each the way a search engine does.

7 checks passed

  • Linked pages load

    All 15 pages we checked loaded without an error.

  • Canonical URLs point to themselves

    No page we checked hands its ranking to a different URL.

  • Every page has a meta description

    All 15 pages that loaded have a meta description.

  • Titles are unique

    Every page we checked has its own title.

  • Every page has an H1

    Each page we checked has a main headline.

  • No linked page is hidden from search

    None of the pages we checked carries a noindex tag.

  • Every page has a title

    All 15 pages that loaded have a <title>.

Best practices

3 to fixGoogle 9285

  • 6 small tap targets

    6 of 26 tappable elements near the top of the page are smaller than 24 px, hard to hit with a thumb.

  • 2 JavaScript errors while loading

    2 errors were logged to the browser console while the page loaded, for example “The source list for the Content Security Policy directive 'script-src' contains an invalid source: 'lead-api.heating-on…”.

  • 1 distorted image

    1 image is displayed at the wrong aspect ratio, so it looks stretched or squashed.

1 checks passed

  • Mobile viewport set

    The page declares a mobile viewport.

Content and conversion

3 to fix50

  • No call to action on the first screen

    On a phone, there is no call to action on the first screen: visitors have to scroll to find out what to do next.

  • No calls to action

    We found no call-to-action buttons or links (such as “Book a demo” or “Get a quote”) anywhere on the homepage.

  • No direct contact details

    No phone number or email link on the homepage, so ready-to-buy visitors have one fewer way to reach you.

  • No form on the homepage

    There is no form on the homepage, so every lead has to click through to another page first.

  • No risk reducer

    No guarantee or risk reducer (money-back, free trial, no credit card) is mentioned, which is often what tips a hesitant visitor.

  • About 842 words of copy

    The homepage carries about 842 words of visible text.

2 checks passed

  • Social proof on the page

    Social proof on the homepage: 2 customer or partner logos and a star rating.

  • Analytics in place

    Analytics detected: Google Tag Manager, Hotjar and TikTok Pixel.

Privacy and tracking

  • 2 cookies set on arrival

    2

    Opening the homepage sets 2 cookies (measured from a US location before any click).

  • 2 other companies contacted

    Loading the homepage contacts 2 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.

2 checks passed

  • Consent tool: consentmanager

    A consent management tool (consentmanager) loads with the page.

  • No known trackers before consent

    No known advertising or analytics trackers load before a visitor clicks anything (measured from a US location before any click).

Security, domain, email and software versions

The security, domain and email checks, software and plugin versions, and any app with a known security problem are visible only to people at vaillant.at, because details like these could help someone attack a site. Every review keeps them private, whatever they found.

Upkeep, stack and company

Stack

Framework
Next.js
Analytics
Google Tag Manager | Hotjar

Upkeep, stack, hiring and company data from programmable.info

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