- 1. OVERVIEW
- 2. What are the main differences between Fergus and GES?
- 3. GES is made only for heating & plumbing businesses
- 4. GES has everything a heating engineer needs, in one app
- 5. GES offers simple setup with best-in-class support
- 6. FEATURE COMPARISON
- 7. Two solid job management platforms, only one built for heating & plumbing
- 8. Moving from Fergus?
- 9. Start your free trial
- 10. Ask us to import your data
- 11. Quick & easy onboarding
- 12. IN DETAIL
- 13. Where GES wins as the heating business platform
- 14. Your analyser talks to the app as you fill out a certificate
- 15. 2,300+ boiler manuals at your fingertips while you're on the tools
- 16. All the gas tools you need, built in
- 17. Boiler service reminders that are truly automated
- 18. GES is more than a tool. It’s a proven way to run your heating business
- 19. How to know which one actually fits your business
- 20. You run a multi-trade business
- 21. You're a heating & plumbing business regularly issuing certificates
- 22. TRY GES FOR FREE
- 23. Try GES for free
- 24. Fergus vs Gas Engineer Software: FAQs
- 1. OVERVIEW
- 2. What are the main differences between Fergus and GES?
- 3. GES is made only for heating & plumbing businesses
- 4. GES has everything a heating engineer needs, in one app
- 5. GES offers simple setup with best-in-class support
- 6. FEATURE COMPARISON
- 7. Two solid job management platforms, only one built for heating & plumbing
- 8. Moving from Fergus?
- 9. Start your free trial
- 10. Ask us to import your data
- 11. Quick & easy onboarding
- 12. IN DETAIL
- 13. Where GES wins as the heating business platform
- 14. Your analyser talks to the app as you fill out a certificate
- 15. 2,300+ boiler manuals at your fingertips while you're on the tools
- 16. All the gas tools you need, built in
- 17. Boiler service reminders that are truly automated
- 18. GES is more than a tool. It’s a proven way to run your heating business
- 19. How to know which one actually fits your business
- 20. You run a multi-trade business
- 21. You're a heating & plumbing business regularly issuing certificates
- 22. TRY GES FOR FREE
- 23. Try GES for free
- 24. Fergus vs Gas Engineer Software: FAQs
FERGUS ALTERNATIVE
Fergus vs
Gas Engineer Software
Both offer job management, quotes, invoices, and certificates from a web portal and phone combo. The difference is focus: While Fergus covers 10+ trades from electrical to pest control, Gas Engineer Software places all effort into making software for UK heating & plumbing businesses.
OVERVIEW
What are the main differences between Fergus and GES?
-
1
GES is made only for heating & plumbing businesses
Fergus is built for ten-plus trades: electricians, roofers, cleaners, pest control, etc. Gas Engineer Software is built for heating & plumbing, and nothing else.
This means you aren't paying for features you'll never use, the app stays uncluttered, and workflows are built around your work, not bolted on.
-
2
GES has everything a heating engineer needs, in one app
With GES you get gas rate and pipe sizing calculators, 2,300+ boiler manuals, and boiler AI Assist, all in the same app you schedule jobs and create your records.
You can even connect to your flue gas analyser via Bluetooth to import readings into your certificate.
-
3
GES offers simple setup with best-in-class support
Gas Engineer Software is quick and easy to set up, but we pride ourselves on offering the best support in the industry.
While Fergus only offers phone support on their Professional plan, GES has a helpline available Mon-Fri, 9-5 for all plans and even trial users.
FEATURE COMPARISON
Two solid job management platforms, only one built for heating & plumbing
Where the two line up, and how Gas Engineer Software adds more. (As of September 2026).
| Features | Fergus | Gas Engineer Software |
|---|---|---|
| On the tools | ||
| Built for gas & heating only | Caters to many different trades | |
| UK gas & oil certificatesCP12, service records, oil, LPG & more | ||
| Flue gas analyser integrationReadings straight into the certificate | Kane, Anton & TPI | |
| Boiler manuals in the app | 2,300+ | |
| AI boiler assistant | ||
| In-app gas rate calculator | ||
| In-app pipe sizing calculator | ||
| Saved appliance detailsPre-filled on the next visit | ||
| Getting paid | ||
| Quotes, estimates & invoices | ||
| Take payment on site | Fergus Pay | Crezco |
| Payment feeWhat it costs to get paid | 1.6% + 20p | £1 flatAny invoice size |
| Invoice payment reminders | ||
| Accounting integrations | No Sage integration | |
| AI Quoting & Invoicing | ||
| Running the business | ||
| Scheduling & calendar | ||
| Job management | ||
| Customer management (CRM) | ||
| Team & user management | ||
| Automated service reminders | Manually set after each job | Automatically scheduled after issuing certificates |
| Purchase orders | Professional plan | |
| Supplier integrations & pricebooks | ||
| Job costing & margin per job | Professional plan | |
| Timesheets / tracking | From £12/user extra | |
| Support & cost | ||
| UK-based support team | Yes, but phone support only on the Professional plan | |
| Free onboarding call | ||
| Free trial | 14 days, no card | 14 days, no card |
| Published price | £39–£45Per user, per month | £18–£31Per user, per month |
| Try GES today: Start free trial |
Compiled from fergus.com/uk, help.fergus.com and gasengineersoftware.co.uk, September 2026. Both are priced per user, per month, excluding VAT. Both companies change their products, so check before you decide.
"Gas Engineer Software is a great fit. For the price range, you'd have to be psychotic to say no — it's such great value for money."
Moving from Fergus?
We can help you import all your data and get started without hassle. Just let us know as you sign up and we’ll get you sorted.
Start your free trial
Sign up in minutes and get full access for 14 days — no card, no commitment.
Ask us to import your data
Send us your customers, addresses, and service dates and we’ll bring it all across for you in one go.
Quick & easy onboarding
There's no need for a complex onboarding and setup process. If you need help, our UK support team is always available to help.
Get your first 14 days free:
IN DETAIL
Where GES wins as the heating business platform
Both GES and Fergus offer great job management capabilities, but the key difference is that while Fergus considers certificates as an add-on feature, GES treats them as a core part of the job. Here’s how:
GES is more than a tool. It’s a proven way to run your heating business
Easy to use & set up
It takes minutes to set up & learn Gas Engineer Software.
Grows with your business
Add users as you grow, and manage teams effectively.
Reliable & proven system
Save hours & fill your diary with repeat work from reminders.
How to know which one actually fits your business
You run a multi-trade business
- You've got electricians, builders or roofers on the books as well as heating engineers
- Purchase orders and supplier pricebooks are part of how you buy
- You need timesheets and work with contractors regularly
- You want to wire your own systems together through an API or Zapier
You're a heating & plumbing business regularly issuing certificates
- Certificates and service/installation records are most of your week
- You want your analyser, manuals and calculators in the same app as the paperwork
- You want to minimise your paperwork with an easy-to-use app
- You don't do work outside of heating & plumbing
- You value top-tier support whether you're on the top plan or not
- You don't want to spend upwards of £40 per user, per month
TRY GES FOR FREE
Try GES for free
Try GES, create certificates, and more in a 14-day free trial. Learn more about switching to GES.
- Try every feature during your trial
- Ask us to import your customers
- Free onboarding call included
- No credit card required
Fergus vs Gas Engineer Software: FAQs
Anything we haven't covered? Talk to our team.
Does Fergus do gas certificates?
Yes. Fergus has a UK certificates add-on, free on their plans, covering the Landlord and Homeowner Gas Safety Record along with a range of gas, oil and electrical records.
The certificates themselves aren't the difference — what sits around them is. Gas Engineer Software pulls your analyser readings in over Bluetooth, remembers the appliance details from the last visit, and queues the service reminder the moment you issue the record.
Which one works out cheaper?
Gas Engineer Software is the more cost effective option for heating & plumbing businesses. Fergus costs £39 to £45 per user a month across Essentials and Professional, with timesheet users charged on top from £12 each. GES is £18 to £31 per user depending on the plan.
Can you help move my data over?
Yes. Export what you've got out of your existing platform/system and our UK team will walk you through getting customers, appliances and job history into GES during the trial, on a free onboarding call.
Plenty of people run both side by side for the fortnight before they commit to either.
How long is the trial, and do you need a card?
14 days with access to every feature, and no card details to start.
That's long enough to put a couple of weeks of real jobs through it and see whether the certificates and reminders work the way you do. If it doesn't suit, do nothing and it stops.