theunderfloorheatingstore.com website review

About 741 KiB of JavaScript is downloaded but never used on this page. Google estimates it would make the page about 3.2 s faster on a phone.

20 files are served with short cache lifetimes, so returning visitors download them again (245 KiB).

8 third-party services load with your homepage (Google Tag Manager, Hubspot and Klaviyo and others), adding 1.9 MB and 992 ms of main-thread time.

Your mobile performance score is 50 (desktop: 84). Pages that score under 90 lose visitors before the first paint.

8 images could be 308 KiB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen. Google estimates it would make the page about 450 ms faster on a phone.

Google Tag Manager costs a phone 571 ms of main-thread work and 791 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.

A phone's processor spends 3.0 s on main-thread work while loading, 1.4 s of it running JavaScript. Above 2 s, taps and scrolls feel sluggish.

The page has 1,556 HTML elements. Above 1,500, rendering and every interaction get slower on phones.

Shopify costs a phone 56 ms of main-thread work and 623 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.

About 19 KiB of CSS is downloaded but never applied on this page. Google estimates it would make the page about 200 ms faster on a phone.

Polyfills for old browsers add 43 KiB JavaScript that modern phones do not need. Google estimates it would make the page about 150 ms faster on a phone.

7 long tasks block the main thread while loading, the longest for 191 ms. During a long task the page ignores taps.

4 KiB could be saved by minifying CSS.

Desktop scores 84 but mobile only 50. A gap that wide usually means heavy scripts and images that hit phones hardest.

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 first text or image appears after 8.4 s on a phone. Good is under 1.8 s.

Your largest element takes 21.2 s to render on a phone. Google's threshold for “good” is 2.5 s. The largest element is the image.

The page becomes fully interactive after 23.0 s. Good is under 3.8 s.

Visually, the page fills in at 8.9 s (Speed Index). Good is under 3.4 s.

Over the last 25 four-week periods to 2026-10-17, real Chrome visitors' tap response (inp) went from 130 ms to 163 ms at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Scripts block taps and scrolling for 298 ms in total while the page loads. Good is under 200 ms.

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

Your homepage downloads 3.8 MB in 283 requests on a phone: scripts 2.1 MB (124), images 817 KiB (22) and other files 773 KiB (117). Under 2 MB keeps phones on slow connections fast.

request-quote-homepage-carousel-mobile_41127253-8f6f-4427-99 is on the first screen but marked loading="lazy", so the browser waits before fetching it and the page looks finished later. Load it eagerly (and give it fetchpriority="high" if it is the main image).

4 images (221 KiB) are JPEG, PNG or GIF. The same pictures as WebP or AVIF are usually much smaller at the same quality, and every current browser shows them.

By the Sustainable Web Design model, a visit to your homepage emits about 1.09 g of CO₂e: 130.6 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

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

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

6 images have no alt text, which hurts accessibility and image search.

All page content should be contained by landmarks: 7 elements on the page fail this check, rated moderate by axe-core.

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

Headings skip levels (h2 → h6 and h2 → h4), which makes the page harder to scan with a screen reader.

Structured data found (FAQPage, Organization and WebSite) but with 1 problem, for example “Organization: sameAs is an empty list”.

Your <h1> is empty.

The homepage links to 273 pages on theunderfloorheatingstore.com and 3 external pages.

Your Organization JSON-LD is missing sameAs (social profiles), description and contact details. These are the facts AI assistants use to describe a business and to tell it apart from others with a similar name.

https://www.theunderfloorheatingstore.com/customer_authentication/redirect has no <title>, so Google invents the link text in results.

https://www.theunderfloorheatingstore.com/customer_authentication/redirect is marked noindex but linked from your homepage. If it is meant to be found, remove the noindex.

https://www.theunderfloorheatingstore.com/customer_authentication/redirect has no meta description, so Google writes the search snippet from whatever text it finds.

https://www.theunderfloorheatingstore.com/pages/request-a-quote, https://www.theunderfloorheatingstore.com/customer_authentication/redirect and https://www.theunderfloorheatingstore.com/collections/electric-underfloor-heating have no <h1> headline, so visitors and search engines get no clear main topic.

We fetched 15 pages linked from your homepage (of 139 found) and read each the way a search engine does.

27 of 51 tappable elements near the top of the page are smaller than 24 px, hard to hit with a thumb.

1 error was logged to the browser console while the page loaded, for example “Cannot read properties of null (reading 'addEventListener')”.

Your homepage shows a street address but no LocalBusiness JSON-LD, so Google and AI assistants have to guess your address, hours and phone from the page text.

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 650 words of visible text.

Before a visitor clicks anything, the page loads Google Ads, Google Analytics, Google Tag Manager, Hotjar and Klaviyo and 4 mores (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 21 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 40 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.