For UK gas engineers
The gas engineer app for manuals, fault codes and service data
Most trade apps do paperwork. Flint does the reference side: what the manual says about the appliance you are stood in front of, without scrolling ninety pages of PDF in a loft.
| What | How much |
|---|---|
| Manufacturers | 48 |
| Gas boilers | 1,100+ |
| Fault codes, decoded | 50,000+ |
| Models with the manual on file | 96% |
| Models with structured service figures | 900+ |
What is in it
- The manufacturer manual for the model you searched, with full-text search inside the PDF.
- Fault codes with what the code means, the likely cause and the parts most often replaced. Grouped and filterable, and matched to what the display actually shows.
- Structured service figures: combustion targets at maximum and minimum rate, gas and burner pressures, service mode, gas valve settings, sensor tables. Every value cited to its page in the manual.
- Ask Flint, which answers from that model's own manual and shows the page, rather than a generic answer off the internet.
- Unsafe situations, giving the IGEM/G/11 classification with the required action in order and a RIDDOR flag.
- Boiler age from the serial number, for the makes that publish the rule.
- Calculators: gas rate, CO/CO₂ ratio, temperature rise, expansion vessel, and a tightness test tool built to IGEM/UP/1B Edition 4.
- Every maker's technical helpline, one tap to call.
Try the calculators first
Four of them are free on this site, no account needed. They are the same calculations that are in the app.
What it costs
£3.99 a month, or £29.99 a year. One saved callback covers the year. There is no advertising in it and no free tier for new accounts, so what you pay is what funds it.
What it is not
It is not job management. No certificates, no invoicing, no diary. If that is what you need, a trade admin app does it better and the two sit alongside each other fine.
It is gas only, domestic. It does not decide anything, sign anything off, or authorise work. That gates on a competent person with a conforming analyser, which is you.
The app
Start on the web, then sign in on your phone
Create the account in a browser, and the same login works in the iPhone app, the Android app and at app.flintfix.com. On iPhone a code has to be redeemed on the web, so starting there saves a step.
Get Flint£3.99 a month, or £29.99 a year. Cancel any time.
Common questions
What is the best app for gas engineers?
It depends what you need it for. Job management apps handle certificates, quotes and invoicing. Flint is a reference app: manufacturer manuals, fault codes, structured service figures and calculators for 1,100+ gas boilers, plus an AI that answers from that boiler's own manual with the page cited.
Is there a free app for gas engineers?
The calculators on this website are free to use with no sign-up. The app itself is £3.99 a month or £29.99 a year, with everything included and no advertising.
Does Flint replace the manufacturer helpline?
It answers most of what you would ring for, faster, because it reads the manual for that exact model. The helpline numbers are built into the app for when you still need them.
What phones does it work on?
iPhone and Android, and in any browser at app.flintfix.com. One account works across all three.
Flint is a reference tool for competent, Gas Safe registered engineers. Everything here informs your judgement and never replaces it. Always work to the manufacturer's instructions and the current standards, and check every figure against the appliance data badge and manual.