Online Boiler Company Website Audit

On-page SEO is the foundation that determines whether your website can be found, understood, and trusted by both search engines and potential customers. It encompasses all the technical and content elements on your individual web pages that directly influence how search engines rank your site and how users interact with it in search results.

Think of on-page SEO as your website’s ability to communicate clearly with Google’s algorithms and AI systems. When these elements are properly configured, search engines can easily understand what your business offers, who it serves, and why it should rank for relevant searches. This translates directly into higher visibility for the keywords that matter to your business, better click-through rates from search results, and ultimately more qualified leads walking through your door.

For a boiler installation company like yours operating in Glasgow and Central Scotland, strong on-page SEO means the difference between appearing when someone searches ‘boiler installation Glasgow’ versus being buried on page three where nobody looks. Elements like your page titles, meta descriptions, heading structure, and image optimisation work together to signal relevance and authority to search engines, while also making your listing more attractive and trustworthy to potential customers scanning search results.

The commercial impact is significant. Poor on-page SEO doesn’t just hurt rankings – it directly affects the quality of traffic you receive, how many people click through to your site, and whether those visitors convert into paying customers. A well-optimised page can increase organic traffic by 20-50% and improve conversion rates by making your value proposition clearer and your business more trustworthy in the eyes of both search engines and users.

How You Are Doing – 4/10

Your website shows a mixed picture with some strong fundamentals undermined by critical technical gaps. On the positive side, your homepage is properly indexable and followable, has substantial content (2,477 words), includes LocalBusiness schema markup, and has the All in One SEO plugin installed for easy management. Your page loads with the correct content type and has reasonable cache control settings.

However, several high-impact issues are significantly limiting your search performance. You have multiple H1 tags on the homepage which confuses search engines about your primary focus, no meta description which means Google is writing your search snippets for you, and a missing canonical tag that could lead to duplicate content issues. Additionally, 4 out of 29 images are missing alt text, your social media tags are completely absent, and you lack basic security headers. These issues combined create a significant drag on your potential organic performance and click-through rates from search results.

Page Basics and Technical Foundation

The technical foundation of your homepage is solid, which provides a stable base for SEO improvements. Your page returns a proper 200 status code, serves with the correct HTML content type, and includes cache control headers that help with page speed. The page is flagged as indexable and followable, meaning search engines can crawl and rank it without restrictions.

Your content volume is particularly strong at 2,477 words, well above the minimum threshold for helpful content and providing plenty of opportunity to target relevant keywords and answer customer questions. The All in One SEO plugin is detected, giving you the tools to make rapid improvements to titles, meta descriptions, and schema markup. Google Tag Manager is also present, which is essential for tracking the impact of SEO changes on lead generation and conversions.

Current Status: HTTP 200 response, content type ‘text/html; charset=UTF-8’, cache control ‘public, s-maxage=216000’, indexable and followable flags both true, 2,477 words of content.

Actions Needed:

• No immediate technical changes required – foundation is solid
• Content team: Review content structure to ensure key services and benefits are clearly highlighted
• SEO team: Use existing strong word count to target additional long-tail keywords

Canonical Tags and URL Structure

Your homepage is missing a critical canonical tag, which is a significant technical SEO issue. Canonical tags tell search engines which version of a page is the preferred one to index, preventing problems with duplicate content across different URL variations (www vs non-www, HTTP vs HTTPS, with or without trailing slashes).

Without a canonical tag, search engines may split ranking signals between multiple versions of your homepage, weakening your overall authority for key terms like ‘boiler installation Glasgow’. This can directly impact your ability to rank competitively for your most important keywords and may result in the wrong URL version appearing in search results.

Current Status: meta.canonical not detected, canonicalSelf flag is false, indicating no self-referential canonical present.

Actions Needed:

• Developer/SEO: Add self-referential canonical tag: <link rel=’canonical’ href=’https://yourdomain.com/’>
• SEO: Ensure canonical uses your preferred protocol and subdomain (HTTPS and www or non-www)
• SEO: Monitor Search Console after implementation to confirm only canonical URL is indexed

Title Tags and Meta Descriptions

Your homepage title tag ‘The Online Boiler Company | New Boiler Installation Experts’ is present and appropriately sized, which is positive for both rankings and click-through rates. However, you’re missing a meta description entirely, which is a significant missed opportunity for controlling how your page appears in search results.

Meta descriptions act as your advertising copy in search results – they’re often the deciding factor in whether someone clicks your listing or a competitor’s. Without one, Google creates its own snippet which may not highlight your key selling points like fixed pricing, local focus, or financing options. This directly impacts click-through rates and the quality of traffic you receive.

Current Status: Title present at appropriate length, meta description completely missing (metaMissing flag true).

Actions Needed:

• Content/SEO: Create compelling meta description (120-155 characters) highlighting key benefits: ‘Professional boiler installation in Glasgow. Fixed-price combi boiler installs from £1199. Finance available. 4.9★ rated. Free quotes.’
• SEO: A/B test different meta descriptions through Search Console to optimise click-through rates
• SEO: Monitor impressions and CTR data to measure improvement impact

Heading Structure and Content Hierarchy

Your heading structure has a critical flaw that’s undermining your SEO effectiveness. The page contains two H1 tags: ‘JANUARY SALE! COMBI BOILERS FULLY INSTALLED FOR ONLY £1199! LIMITED STOCK AVAILABLE’ and ‘JANUARY SALE! COMBI BOILERS FOR ONLY £1199! LIMITED STOCK AVAILABLE’. Multiple H1s confuse search engines about your page’s primary focus and dilute the semantic signal for your most important keywords.

Your H2 and H3 structure shows good variety covering key topics like trust signals, service areas, and brand information. However, the promotional focus of the H1s may not be optimal for long-term SEO, as search engines prefer descriptive, keyword-rich headings that clearly communicate page purpose rather than sales-focused copy.

Current Status: Two H1 tags detected (h1Multiple flag true), varied H2/H3 structure covering business aspects, promotional tone in primary headings.

Actions Needed:

• Content/SEO: Consolidate to single H1 focused on core service: ‘Boiler Installation Glasgow – Professional Combi Boiler Experts’
• Content: Convert duplicate H1 to H2 or remove if redundant
• SEO: Ensure heading hierarchy follows logical structure (H1 → H2 → H3) throughout page
• Content: Review all headings to balance promotional messages with SEO-friendly keyword inclusion

Images and Accessibility

Your homepage contains 29 images but 4 are missing alt text, representing 13.8% of your total images. This significantly exceeds the recommended maximum of 5% missing alt text and creates both accessibility and SEO issues. The missing alt text affects important trust signals including Trustpilot graphics and business imagery.

Missing alt text particularly impacts images that build credibility like your Trustpilot score graphic and Google reviews. These trust indicators are crucial for conversion rates, but without proper alt text, they’re invisible to screen readers and search engines, reducing both accessibility compliance and the SEO value of your social proof.

Current Status: 4 of 29 images missing alt text including ‘xtrustpilot-score-graphic-2.jpg’ (appears twice), ‘google.jpg’, and profile image ‘IMG_9979-58×58.jpeg’.

Actions Needed:

• Content/Developer: Add descriptive alt text to Trustpilot images: ‘Trustpilot 4.9 star rating for The Online Boiler Company’
• Content: Add alt text to Google image: ‘Google reviews for boiler installation services’
• Content: Add alt text to profile image with person’s name/role if appropriate
• SEO: Audit all site images and maintain missing alt text below 5% of total images

Social Media and Brand Signals

While your homepage includes links to Facebook and Instagram accounts (positive for local business credibility), you’re completely missing Open Graph and Twitter Card meta tags. This means when your homepage is shared on social media, it will appear with generic, unattractive previews that don’t showcase your brand or value proposition effectively.

Social shares can drive significant referral traffic for local businesses, and professional-looking shared content builds trust and increases click-through rates. Missing social meta tags represent lost opportunities for word-of-mouth marketing and reduced effectiveness of any social media marketing efforts.

Current Status: Facebook and Instagram links present, but openGraph.title, openGraph.description, openGraph.image, and all Twitter card elements not detected (ogComplete flag false).

Actions Needed:

• Developer/SEO: Add Open Graph tags including title, description, and 1200x630px image
• Developer: Add Twitter Card meta tags (summary_large_image format recommended)
• Design: Create branded social sharing image showcasing key offer or service area
• SEO: Test social previews using Facebook and Twitter validation tools

Structured Data and Schema Markup

Your website includes LocalBusiness schema markup, which is excellent for a geographically-focused service business. This structured data helps search engines understand your business details and can contribute to enhanced search results including knowledge panels, local pack listings, and rich snippets that improve visibility and click-through rates.

LocalBusiness schema is particularly valuable for businesses serving specific geographic areas like Glasgow and Central Scotland, as it reinforces your local relevance signals and can improve performance in location-based searches. The presence of this markup suggests good technical SEO foundations.

Current Status: 2 schema blocks detected, LocalBusiness type present, providing structured business information to search engines.

Actions Needed:

• SEO: Verify schema includes complete business details (name, address, phone, hours, service area)
• Developer: Ensure schema includes sameAs properties linking to social profiles
• SEO: Test structured data using Google’s Rich Results Test tool
• SEO: Monitor Search Console for schema-related enhancements and errors

Security Headers and Trust Signals

Your website is missing all standard security headers including Strict-Transport-Security, Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options. While these don’t directly impact search rankings, they affect user trust, browser security warnings, and can influence how third-party tools and crawlers interact with your site.

For a business handling customer inquiries and potentially payment information, security headers demonstrate professionalism and protect against common web vulnerabilities. Missing headers can trigger browser warnings that increase bounce rates and reduce conversion rates.

Current Status: All security headers not detected – no HSTS, CSP, X-Frame-Options, or X-Content-Type-Options present.

Actions Needed:

• Developer: Implement Strict-Transport-Security header: ‘max-age=63072000; includeSubDomains’
• Developer: Add X-Content-Type-Options: ‘nosniff’ and X-Frame-Options: ‘DENY’
• Developer: Implement Content-Security-Policy appropriate for site functionality
• Developer: Test headers using online security scanners after implementation

Why It Matters to Your Business

Conversion architecture is the structure and sequence that turns visitors into enquiries or orders through clear value proposition, obvious signposts, easy next steps, proof at decision points, and a friction-free path to submit or buy. Think of it as the digital equivalent of a well-designed shop floor that guides customers naturally towards the till.

Here’s the money link: if your current landing page converts 3 in 100 visitors into boiler enquiries, improving your conversion architecture could lift that to 5 in 100 – that’s a 67% increase in leads without spending an extra penny on ads. For a boiler company in Glasgow, that could mean 20-30 additional qualified enquiries per month, potentially worth £30,000-£50,000 in additional revenue.

• Primary CTA visible and compelling above the fold on mobile without scrolling
• Lead capture form with ≤5 essential fields and inline validation
• Trust signals (reviews, Gas Safe certification, guarantees) positioned next to the CTA
• Clear pricing or next-step information visible immediately
• Mobile contact options including tap-to-call and WhatsApp for instant connection
• Urgency and scarcity messaging that drives immediate action
• GA4 event tracking in place to measure form starts, completions, and phone calls
• Sticky CTA or floating contact button for continuous conversion opportunity

How You Are Doing

Score: 4/10

Your landing page has strong foundations with excellent social proof (over 30,000 Facebook likes and multiple testimonials) and a clear January sale offer at £1199 for combi boilers. However, the conversion architecture suffers from significant friction points: no prominent CTA above the fold, a complex 7+ field form that could intimidate users, weak visual hierarchy, and navigation that distracts from the main conversion goal. The mobile experience lacks essential features like tap-to-call and sticky CTAs that modern boiler customers expect.

What You Are Doing Well

• Outstanding social proof: ‘Over 30,000 Likes’ prominently displayed with multiple customer testimonials featuring photos builds immediate trust
• Clear value proposition: ‘JANUARY SALE! COMBI BOILERS FULLY INSTALLED FOR ONLY £1199! LIMITED STOCK AVAILABLE’ communicates both price and urgency
• Comprehensive testimonials: Multiple customer reviews with photos and specific details about service quality provide strong credibility
• Professional imagery: Clean product photos and team images reinforce legitimacy and expertise
• Complete contact information: Phone number, email, and physical address clearly displayed for trust
• Technical credentials: Gas Safe registration and professional certifications visible to buyers

Where You Can Do Better

• Add a prominent CTA above the fold: Place a large, contrasting ‘Get My Free Quote’ button next to your headline. Mobile users need immediate action options without scrolling. Target: Increase above-fold engagement by 40%.
• Simplify your lead form to 4-5 essential fields: Reduce from 7+ fields to name, phone, postcode, and boiler type only. Convert open text questions like ‘Do you currently have a combi boiler?’ to radio buttons. Target: Improve form completion rate from estimated 15% to 25%.
• Implement sticky mobile CTA: Add a floating ‘Call Now’ or ‘Get Quote’ button that follows scrolling on mobile. Modern boiler customers expect instant contact options. Target: Increase mobile conversions by 30%.
• Add tap-to-call functionality: Make your phone number clickable on mobile with tel: linking. Boiler emergencies require immediate contact. Target: Capture 20% more phone enquiries.
• Position trust signals near your form: Move key testimonials and Gas Safe certification adjacent to the lead capture form where users make their decision. Target: Reduce form abandonment by 25%.
• Create urgency with countdown timer: Add a real countdown for your January sale to reinforce ‘limited stock’ claims. Target: Increase conversion rate by 15% through FOMO psychology.
• Optimise CTA button copy: Change ‘Send your request’ to benefit-driven text like ‘Get My Fixed Price Quote in 24 Hours’. Target: Improve click-through rates by 20%.
• Minimise navigation distractions: Hide or reduce top menu options to keep focus on form completion. Landing pages should funnel towards one primary action. Target: Reduce bounce rate by 15%.
• Add inline form validation: Provide instant feedback on field completion to reassure users and prevent submission errors. Target: Reduce form errors by 50%.
• Implement GA4 conversion tracking: Set up events for form starts, completions, and phone clicks to measure improvement accurately. Target: Gain clear conversion data within 30 days.

What We Found (The Nerdy Stuff)

Additional notes

• Your January sale messaging is strong but would benefit from dynamic urgency elements like countdown timers
• Consider A/B testing simplified 3-field forms against your current 7+ field version
• WhatsApp integration could capture younger boiler buyers who prefer messaging
• Video testimonials would add powerful social proof near your main CTA

Why It Matters

Page speed and Core Web Vitals are no longer just technical nice-to-haves – they’re direct drivers of your bottom line and search visibility. Google’s mobile-first indexing means your mobile performance determines how well your pages rank, and with AI-driven search results increasingly filtering out slow sites, poor Core Web Vitals can exclude you from valuable answer boxes and featured snippets entirely.

Every second of delay costs you real money. Research consistently shows that users abandon pages taking longer than 3 seconds to load, and conversion rates drop by 7% for every additional second of load time. When your mobile visitors are waiting over 13 seconds for content to appear, you’re haemorrhaging potential customers before they even see what you offer. This abandonment doesn’t just hurt immediate sales – it damages your Quality Score for paid ads, increases your cost per click, and reduces the lifetime value of every marketing pound you spend.

From an SEO perspective, slow pages consume more crawl budget, meaning search engines discover and index your new content slower. This creates a compounding problem where poor technical performance reduces your organic reach, forces you to spend more on paid advertising to compensate, and still delivers a poor user experience that converts badly. The current mobile lab results showing 13.7-second load times represent a critical business risk that’s likely costing you both search rankings and direct revenue every day.

How You Are Doing

Score: 3/10

This low score reflects a critical mobile performance crisis that poses immediate business risk. Your mobile lab results show catastrophic load times with LCP at 13.7 seconds and TTI also at 13.7 seconds – well beyond acceptable thresholds where users abandon pages. While desktop performance is reasonable at 79/100 with 2.7-second LCP, mobile-first indexing means your mobile experience determines search rankings. The massive mobile performance gaps from unused JavaScript (1640ms potential savings), redirects (1381ms), and unused CSS (750ms) indicate systemic technical debt that’s actively harming conversions and search visibility.

Your Results

Your site shows a stark mobile-desktop performance divide that’s commercially dangerous. Mobile performance scores just 47/100 with devastating 13.7-second LCP and TTI times, while desktop achieves 79/100 with manageable 2.7-second metrics. Critically, no field data was provided, meaning we cannot confirm real-user Core Web Vitals status, though mobile lab results strongly suggest CWV failures. The mobile experience is currently unusable on slower networks, with Speed Index at 12.8 seconds indicating users wait over 10 seconds before seeing meaningful content.

What You Are Doing Well

• Perfect layout stability with CLS of 0 across both mobile and desktop, preventing jarring content shifts that harm user experience and conversions.
• Desktop performance achieves solid 79/100 score with reasonable 2.7-second LCP, showing your core infrastructure can deliver good experiences.
• Server response appears optimised with Lighthouse noting ‘Initial server response time was short’ with 0ms improvement potential.
• Desktop Speed Index of 2.2 seconds demonstrates fast visual completeness on larger screens and faster connections.
• Desktop TTI of 2.7 seconds shows acceptable interactivity timing for desktop users browsing your site.
• Desktop TBT of just 60ms indicates minimal main thread blocking on desktop, suggesting JavaScript execution is manageable on powerful devices.
• No critical accessibility or security warnings detected in the technical audit, providing a solid foundation for performance improvements.
• Cache-control and compression opportunities show potential for quick wins rather than fundamental architecture problems.

What You Need to Do

The performance crisis on mobile is actively costing you search rankings, paid advertising efficiency, and direct conversions every day. With Google’s mobile-first indexing, your 13.7-second mobile load times are telling search engines your site provides poor user value, reducing crawl frequency and ranking potential. Simultaneously, users encountering these delays abandon before seeing your content, wasting every marketing pound spent driving traffic. The identified opportunities showing 1640ms JavaScript savings, 1381ms redirect elimination, and 750ms CSS optimisation represent over 3.7 seconds of recoverable load time – enough to transform user experience and dramatically improve conversion rates.

These performance issues represent an immediate commercial emergency requiring urgent technical intervention. Every day of delay costs you search rankings as competitors with faster sites gain crawl preference and user engagement advantages. Start with the highest-impact changes – eliminating unused JavaScript and redirects can recover nearly 3 seconds of mobile load time within weeks, dramatically improving both user conversions and search engine evaluation of your site quality.

Are You Ready for the AI (Search) Revolution

Why It Matters to Your Business

AI-powered search is reshaping how customers discover and shortlist boiler companies. When someone searches for ‘gas boiler replacement near me’ or ‘combi boiler installation cost’, they increasingly get AI-generated overviews that pull from a select few websites rather than showing ten blue links. If your site isn’t AI-readable, you’re invisible in these critical moments when customers are ready to buy.

This matters because boiler replacements are high-value purchases where customers do extensive research before choosing a supplier. AI systems need to read your content without JavaScript, understand your services through clear headings and schema, and access your pages via bot permissions. Get this right, and you capture qualified demand at lower acquisition costs. Get it wrong, and competitors with AI-optimised sites will steal your organic traffic and revenue.

How You Are Doing

Score: 4/10

Your site has some strong foundations with substantial visible text content (over 16,000 characters in raw HTML) and proper heading structure, but critical AI accessibility issues are holding you back. The JavaScript warning detected means LLMs may struggle to access interactive content, and we cannot verify whether AI bots like GPTBot and Google-Extended are blocked by your robots.txt file – a potential showstopper for AI search visibility.

What You Are Doing Well

• Substantial visible text content (16,000+ characters) available in raw HTML without needing JavaScript execution
• Clear heading hierarchy with H1, H2, and H3 tags supporting semantic content structure
• Structured data implemented via JSON-LD schema for LocalBusiness, Organization, and WebPage
• Meta description present and descriptive for search engines
• Open Graph and Twitter Card metadata implemented for social sharing signals
• Alt attributes included for images enhancing multimedia accessibility

Where You Can Do Better

• Verify AI bot access in robots.txt file (Action). AI systems cannot index content if blocked by robots directives (Why). Check your robots.txt at your domain root and ensure GPTBot, ChatGPT-User, and Google-Extended are not disallowed (How). Target: All major AI bots permitted to crawl (Metric).
• Reduce JavaScript dependency for core content (Action). LLMs read static HTML and ignore JavaScript-rendered content, missing your key service information (Why). Move essential boiler service descriptions, pricing guides, and contact forms into the DOM rather than JS widgets (How). Target: Zero JavaScript warnings and all service content visible in page source (Metric).
• Expand structured data schema coverage (Action). AI systems use schema to understand service offerings and generate rich snippets in AI overviews (Why). Add Product schema for boiler models, FAQ schema for common queries, and HowTo schema for installation guides (How). Target: 5+ schema types covering core services (Metric).
• Create dedicated FAQ sections for common queries (Action). AI systems pull FAQ content for direct answers in chat interfaces and overviews (Why). Build pages addressing ‘boiler replacement cost’, ‘combi vs system boiler’, ‘boiler installation time’ with structured Q&A format (How). Target: 20+ FAQs covering customer journey from research to installation (Metric).
• Add visible content freshness indicators (Action). AI systems favour recently updated content for current information (Why). Include ‘Last updated’ dates on service pages and refresh content quarterly with current pricing and regulations (How). Target: All key pages updated within 90 days (Metric).
• Implement video transcripts for installation guides (Action). AI cannot parse video content without text transcripts, missing valuable how-to information (Why). Add full text transcripts below embedded videos or in expandable sections (How). Target: 100% of videos have complete transcripts (Metric).
• Increase internal linking between related services (Action). AI systems use internal links to understand topic relationships and site authority (Why). Link boiler installation pages to maintenance services, emergency repairs to annual servicing (How). Target: 10+ contextual internal links per service page (Metric).
• Optimise for local entity coverage (Action). AI systems need clear geographic and service entity signals for local search results (Why). Include area names in headings, create location-specific service pages, mention local landmarks and postcodes (How). Target: Primary service areas covered with dedicated pages and 50+ local entities mentioned (Metric).

Summary of Findings

Additional notes

• Manual robots.txt verification required – check https://yourdomain.com/robots.txt to ensure AI bots are not blocked
• Consider implementing hreflang tags if serving multiple geographic markets with localised content
• Page speed optimisation may improve AI crawl efficiency and user experience

Action Checklist