hydronicheatingwarehouse.com website review

Your mobile performance score is 88. Pages that score under 90 lose visitors before the first paint.

8 third-party services load with your homepage (Klaviyo, Shopify and Google Tag Manager and others), adding 1.1 MB and 387 ms of main-thread time.

About 369 KiB of JavaScript is downloaded but never used on this page.

A phone's processor spends 2.5 s on main-thread work while loading, 910 ms of it running JavaScript. Above 2 s, taps and scrolls feel sluggish.

Klaviyo costs a phone 116 ms of main-thread work and 423 KiB of downloads while your page loads. Loading it after the page is usable, or only on the pages that need it, takes that off the critical path.

Shopify costs a phone 113 ms of main-thread work and 334 KiB of downloads while your page loads. Loading it after the page is usable, or only on the pages that need it, takes that off the critical path.

3 files block the first paint until they finish downloading. Deferring or inlining them could save about 150 ms.

10 files are served with short cache lifetimes, so returning visitors download them again (116 KiB).

3 long tasks block the main thread while loading, the longest for 94 ms. During a long task the page ignores taps.

About 66 KiB of CSS is downloaded but never applied on this page.

60 KiB could be saved by minifying JavaScript.

1 image could be 58 KiB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen.

Web fonts hide text while they load. Setting font-display: swap shows text immediately (about 50 ms).

Polyfills for old browsers add 25 KiB JavaScript that modern phones do not need.

6 KiB could be saved by minifying CSS.

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

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

The page becomes fully interactive after 10.7 s. Good is under 3.8 s.

Visually, the page fills in at 6.4 s (Speed Index). Good is under 3.4 s.

The first text or image appears after 2.5 s on a phone. Good is under 1.8 s.

Your largest element takes 2.5 s to render on a phone. Google's threshold for “good” is 2.5 s. The largest element is the text “SEASONAL DEMAND: EXTENDED PROCESSING PERIOD”. Most of its time is element render delay (2.6 s).

1 image have no width and height attributes, so the layout jumps as each one loads.

Over the last 25 four-week periods to 2026-11-07, real Chrome visitors' tap response (inp) went from 86 ms to 90 ms at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Over the last 25 four-week periods to 2026-11-07, real Chrome visitors' largest content (lcp) went from 1.0 s to 1.1 s at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Your homepage downloads 2.5 MB in 305 requests on a phone: scripts 1.2 MB (137), other files 879 KiB (144) and images 105 KiB (6). Under 2 MB keeps phones on slow connections fast.

By the Sustainable Web Design model, a visit to your homepage emits about 0.71 g of CO₂e: 84.7 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

29 elements use ARIA attributes their role does not allow, which confuses screen readers.

40 elements have a tabindex above 0, which scrambles the keyboard order.

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

6 tap targets are too small or too close together to hit reliably with a finger.

1 link inside paragraphs relies on colour alone to stand out.

All page content should be contained by landmarks: 11 elements on the page fail this check, rated moderate by axe-core.

6 visible links have no text or label, so screen readers cannot say where they go.

Headings skip levels (h2 → h6), which makes the page harder to scan with a screen reader.

Your title is 67 characters, so Google will cut it off around 60: “Hydronic Heating Warehouse | Aqua-Hot, Webasto, Oasis & Truma Parts”.

There are 5 <h1> headlines (“Popular Purchased Items”, “Aqua-Hot Parts” and “Webasto Parts”). One clear main headline is easier for people and search engines.

Your meta description is 295 characters; Google truncates after about 160, so the end of your pitch is cut.

Structured data found (BreadcrumbList, Store and WebSite) but with 1 problem, for example “BreadcrumbList: itemListElement is an empty list”.

No twitter:card tag. X falls back to Open Graph, which is set, so this is minor.

The homepage links to 127 pages on hydronicheatingwarehouse.com and 6 external pages.

https://www.hydronicheatingwarehouse.com/collections/all, https://www.hydronicheatingwarehouse.com/collections/all-aqua-hot-parts, https://www.hydronicheatingwarehouse.com/collections/aqua-hot-heaters, https://www.hydronicheatingwarehouse.com/collections/aqua-hot-electrical-parts-wiring-harnesses-relays-controllers, https://www.hydronicheatingwarehouse.com/collections/aqua-hot-plumbing and https://www.hydronicheatingwarehouse.com/collections/aqua-hot-thermostats and 9 others use the same meta description. A description written for each page earns more clicks.

https://www.hydronicheatingwarehouse.com/collections/all has no <h1> headline, so visitors and search engines get no clear main topic.

We fetched 15 pages linked from your homepage (of 45 found) and read each the way a search engine does.

2 errors were logged to the browser console while the page loaded, for example “Access to XMLHttpRequest at 'https://cdn-app.sealsubscriptions.com/shopify/public/css/style.css?shop=y11fue-4v.myshopif…”.

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 testimonials, customer logos, ratings or customer counts on the homepage: nothing tells a new visitor that others already trust you.

A local customer looking to call finds no phone number on the homepage. Add one, ideally as a tap-to-call link.

The homepage shows no opening hours. If customers visit or call, show when.

There is no link to Google or Apple Maps. A directions link is one tap for a phone visitor.

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

The homepage carries about 670 words of visible text.

Before a visitor clicks anything, the page loads Google Ads, Google Analytics, Google Tag Manager and Klaviyo (measured from a US location before any click). No consent tool was detected. Visitors from the EU, UK and several US states must be asked first.

Opening the homepage sets 13 cookies (measured from a US location before any click).

No known cookie consent tool loads with the page. Some sites build their own banner, and some only show one to visitors from the EU.

Loading the homepage contacts 28 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.