The whole job in one app.
Codes to certificates.
Fault-code diagnostics, compliance certificates, gas calculators, job management — all in your pocket, on web, iPhone and Android.
Everything you reach for on a job
One fast app instead of five — diagnostics, calculators, certificates and the business admin, all in your pocket.
Fault code library
1,800+ fault codes across 12 manufacturers, with likely causes and fix steps — searchable on site, even with no signal saved.
Boiler diagnostics
Search faults by symptom or code and work through likely causes and fix steps, backed by manufacturer fault data — no guesswork.
On-site certificates
CP12, service records, warning notices and more — completed, signed and emailed before you leave the property.
Gas calculators
Gas rate, heat loss, and an IGEM/UP/1B Edition 4-compliant let-by & tightness calculator — no more scribbled sums.
Wiring & controls
S-Plan and Y-Plan wiring diagrams, plus a controls database and service-mode reference for getting into the boiler quickly.
This is the actual app
Not mock-ups — these are live screens from BoilerFix AI. Tap any to enlarge.
I built BoilerFix AI because I was sick of carrying five apps, a stack of manuals and a folder of paperwork to every job. So I made the tool I wanted on my own van.
Made by an engineer who's still on the tools
BoilerFix AI isn't built by a software company guessing what the trade needs. It's built by someone who does the job — which is why the fault library, the calculators and the certificates match how you actually work on site.
Real jobs shape every feature. If something's awkward in the field, it gets fixed.
5 stars from engineers on the tools
Real reviews from the App Store and Google Play.
“Very useful app that genuinely helps with day to day work. Clearly built by an engineer who understands the real world challenges. Highly recommended.”
“Excellent app. I was using a different app but it was slow to load and clunky. Been using this before had the app and its quick easy to navigate and way better priced then the other.”
“I pay the same for an old app just for invoicing which I’ve had for years. Now I have reviewed this and I am getting the invoicing and so much more with the BoilerFix AI app, so it made much more sense — being a Plumbing, Heating and Gas engineer. Well done on the excellent works producing this nifty app.”
“Great app, love it.”
Start free. Upgrade if it earns its place.
Seven days free, no card. Then pick the plan that fits — cancel anytime.
Questions, answered
Do I need a card to start?
What does it cost after the trial?
Which devices can I use it on?
Which manufacturers are covered?
Put the whole job in your pocket
Join the engineers running diagnostics, certificates and admin from one app. Start free — see if it earns its place on your van.
Everything you reach for on a job
Stop juggling five apps, a paper pad and a folder of manuals. BoilerFix AI pulls the day-to-day work of a gas engineer into a single, fast interface.
Fault code library
1,800+ fault codes across 12 manufacturers, with likely causes and fix steps — searchable on site, even with no signal saved.
Boiler diagnostics
Search faults by symptom or code and work through likely causes and fix steps, backed by manufacturer fault data — no guesswork.
On-site certificates
CP12, service records, warning notices and more — completed, signed and emailed before you leave the property.
Gas calculators
Gas rate, heat loss, and an IGEM/UP/1B Edition 4-compliant let-by & tightness calculator — no more scribbled sums.
Wiring & controls
S-Plan and Y-Plan wiring diagrams, plus a controls database and service-mode reference for getting into the boiler quickly.
Job calendar
Schedule domestic and landlord jobs, track property history and keep your week organised without a separate diary app.
Quotes & invoicing
Build quotes and estimates, convert them to invoices, and keep simple bookkeeping — branded with your own details.
QR job passports
Stick a QR code to the appliance and build a permanent service history any engineer can scan on the next visit.
Click through and see how it works
Pick a feature on the left and take a look. Every tool is built to be fast and clear with one hand on a cold doorstep.
Certificates
Complete every record on site, sign on screen, and get it to the customer before you've packed the van — each one stored against the job.
Every certificate, ready to go
Real certificates generated in the app — tap any to view it full size.
Save it, file it, send it
Save to your device
Every certificate is saved as a clean PDF on your phone or tablet, ready to keep, print or share — and there even when you're offline.
File in the Customer Hub
It's filed automatically against the right customer, so the whole job and certificate history sits in one place for the next visit.
Email to landlord or client
Send the PDF straight from the job to the landlord, agent or homeowner — signed off and delivered before you leave the door.
Boiler to signed-off in minutes
Complete on site
Pick the certificate, pull in the customer, and fill in the checks as you work — built around the real forms.
Sign on screen
The customer signs directly on your phone or tablet. No paper, no chasing signatures later.
Save & send
Save to the device, file it in the Customer Hub and email it across — all in one tap.
Invoices & Quotes
Build a quote on the doorstep, turn it into an invoice with one tap, and send it out looking like your business — not an app.
From quote to paid invoice
Quotes & estimates
Send professional quotes and estimates with their own numbering (QTE- and EST-), priced up and ready to win the work.
One-tap convert
Won the job? Turn a quote or estimate straight into an invoice without re-typing a thing — it carries everything across.
Your branding
Add your company details so every document goes out as yours — no platform branding on the footer.
Site & job reference
Capture the site address and a job reference number on every document, so nothing gets mixed up across jobs.
Multi-page PDFs
Big job with a long list? Documents flow neatly onto extra pages, so a detailed quote still looks tidy.
Tracked in bookkeeping
Quotes, estimates and invoices feed your bookkeeping, so you can see at a glance what's been paid and what's still due.
Save it, file it, send it
Save to your device
Each quote and invoice is saved as a PDF on your device — keep it, print it, or pull it up again whenever you need it.
File in the Customer Hub
Filed against the customer alongside their certificates and job history, so the full money trail lives in one place.
Email to your client
Send the quote or invoice straight to the client from the job, so they've got it in their inbox before you drive off.
Professional documents, your branding
Previews are mock-ups — drop your real screenshots in any time.
Try it free, then pick your tier
Start with a 7-day free trial — no card required. Stay on Basic for the essentials, or go Pro to unlock the full business toolkit.
- Everything unlocked for 7 days
- No card needed to start
- Cancel anytime
- Everything in Basic
- Job calendar & customer hub
- Quotes, invoicing & bookkeeping
- QR job passports
- Fault codes & diagnostics
- All certificate types
- Gas calculators & wiring diagrams
Good to know
Do I need a card to start the trial?+
What's the difference between Basic and Pro?+
Which devices does it work on?+
Which boiler manufacturers are covered?+
Can I cancel whenever I want?+
Do you work with training centres or housing providers?+
Train apprentices on the real thing
Put the tool the pros use in your apprentices' hands from day one — and let's build a package around your course.
Give apprentices the tool the pros use
The classroom teaches the theory. BoilerFix AI lets your apprentices put it into practice — the same reference, calculators and certificates they'll rely on the day they qualify.
Learn fault-finding
Work through real fault codes and likely fixes, building the diagnostic instinct that only comes with practice.
Master the calcs & regs
Gas rate, heat loss and a current IGEM/UP/1B let-by & tightness calculator — so the numbers and standards stick.
Practise real certificates
Fill out genuine CP12s and service records before they're ever in front of a customer — no more guesswork on assessment day.
Carry it on site
The reference library goes in their pocket on day one, so confidence carries straight from the centre to the van.
Custom packages for your cohort
We work directly with training centres to set up discounted cohort licences, tailored access and packages that fit how you teach. Tell us about your course and we'll build something around it.
Asset management, sorted
Site Passport and Site Manager give you a live view of compliance across your whole housing stock.
Your whole stock, under control
Site Passport and Site Manager turn scattered job sheets into a live asset-management platform. Engineers build a record at every property; you see compliance across your entire stock from one dashboard.
- Full history at every door. A QR code on the appliance opens the complete job and service history — any engineer can scan it on the next visit.
- Compliance you can prove. Track gas safety records and servicing schedules across the portfolio, with a clear audit trail when you need to evidence it.
- One asset register. The Site Manager dashboard gives you a single view of every property — what's compliant, what's due and what's overdue.
- Faster, evidenced repairs. Engineers arrive already knowing the property's history, so jobs get done right the first time.
- Built for teams. Multi-engineer and multi-contractor access, so in-house teams and external firms work from the same records.
Inside the platform
Real screens from the Site Manager oversight dashboard and the Site Passport engineer app — tap any to enlarge.
The Site Manager dashboard
The Site Passport engineer app
Web, iPhone & Android
One account, all your devices. Quote from the laptop, diagnose from the phone — your jobs sync across the lot.