Master Gas Privacy Policy
Last updated: 25 October 2026
This policy explains what information the Master Gas app (for iPhone and iPad) and the Master Gas services collect, why, how it is protected, and the choices you have. Master Gas is a business tool for gas engineers: most of what you enter (customers, certificates, invoices, diary entries) belongs to you and is kept on your device.
1. Who we are
The data controller is Gas Installers Workmate Ltd, trading as Master Gas. Contact: support@mastergas.co.uk.
2. Information we collect
| Information | Why we need it | Where it is kept |
|---|---|---|
| Account details: your login email address, your password (we store and check a one-way scrambled version, not the password itself), subscription type and expiry date, and the device(s) registered to your account. | To sign you in, to check your subscription, and to let you use Master Gas on your registered devices. | Master Gas servers. |
| Business and engineer details you enter: company name, address, logo, VAT number, engineer names and Gas Safe registration numbers. | To print on your certificates, invoices and other documents. | On your device. Included in your backups if you use them (see below). |
| Your records: customers and their addresses, contact details, certificates, jobsheets, invoices, estimates, expenses, mileage, appliances, photos, signatures and diary entries. | To provide the app. This is your data, and we do not use it for any other purpose. | On your device. Included, encrypted, in your backups if you use them. |
| Backups (optional): an encrypted copy of your database, with the date, the app and iOS version, the device model, a random device identifier for this installation of the app, and the device name you choose. | So you can get your data back if you lose, replace or reinstall the app on a device. | Master Gas servers (see sections 4 and 5). |
| Device and app information sent with sign-in and backup requests: app version, iOS version and device model. | To keep the service working, fix faults and prevent misuse. | Master Gas servers. |
| Support messages you send us through the app or by email. | To reply to you. | Our email and support systems. |
The app does not collect your location, does not contain advertising, does not track you across other companies' apps or websites, and does not collect payment card details.
3. Permissions the app may ask for
- Camera and photo library: to attach photos to records and to choose your company logo. Photos stay in your records on your device.
- Contacts: only when you choose to pick a customer's details from your address book, so you do not have to type them. Contacts are copied into a customer record only when you select them. We do not upload your address book.
- Bluetooth: to connect to your combustion analyser and read its measurements.
You can change these permissions at any time in the iOS Settings app.
4. Backups and how they are protected
Backups are optional. You can make one yourself from More > Backups. If automatic backups are made available on your account, the app asks you first and you can turn them off again at any time.
- Your backup is encrypted on your device before it is sent (RSA-4096 and AES-256 encryption with an integrity check). It is sent over a secure (HTTPS) connection.
- It is stored in a private area of our cloud storage. The key needed to open it is held in a secure key vault, and is used only to restore your own data to you, or by authorised support staff when you ask us to help.
- Only someone who signs in with your login can list or restore your backups. We keep a limited number of recent backups per device and delete older ones.
5. Who we share information with
We do not sell your information. We use the following service providers to run Master Gas, who may only handle it on our instructions:
- Microsoft Azure (cloud hosting and storage) for backups and account services, in the United Kingdom.
- Our website host for the Master Gas login and account service at mastergas.co.uk.
- Dropbox, only if you choose to link your own Dropbox account to save or restore backups. That is between you and Dropbox, under Dropbox's own privacy policy.
When you email, text or print a document from the app, it is sent through your own device's mail, messages or printing features, to the recipient you choose.
We may disclose information if the law requires it, or to protect our rights, our users or the security of the service.
6. Licence checks
Each Master Gas login is for one engineer. To make sure the service is used as agreed, we may check how many devices and engineer records are used with a login. This can include the engineer names and Gas Safe numbers on a login, the device identifier, and counts of records created (not the contents of your records or customer data). We use this only to apply our terms and to keep the service fair, and we do not use it for advertising.
7. How long we keep information
- Account details: while your account is open, and for 12 months afterwards, unless the law requires us to keep them longer (for example for accounting).
- Backups: we keep the most recent few backups per device. When you delete your account we delete your backups within 60 days.
- Information on your device stays there until you delete it or remove the app. Records you create for gas safety purposes may have their own legal retention periods, which are your responsibility as the engineer or business.
8. Your rights and deleting your account
Under UK data protection law you can ask us to give you a copy of your information, correct it, delete it, restrict or object to how we use it, or move it to another service.
To delete your account: in the app go to More > My Account > Delete My Account, or visit www.mastergas.co.uk/delete-account. We then delete your account and the data we hold about you on our servers, including backups. Data held only on your device is removed when you delete the app.
For any other request, email support@mastergas.co.uk. We will reply within one month. If you are unhappy with how we handle your information you can complain to the Information Commissioner's Office (ico.org.uk), though we would appreciate the chance to put things right first.
9. Security
All communication between the app and our servers uses secure HTTPS connections. Backups are encrypted before they leave your device. Access to our systems is restricted to authorised staff. No system is perfectly secure, so please use a strong password, keep your device updated and use a passcode on your device.
10. Children
Master Gas is a professional tool and is not intended for anyone under 18. We do not knowingly collect information from children.
11. International transfers
If any information is processed outside the UK, we make sure it is protected by an appropriate safeguard, such as the UK's approved standard contractual clauses or an adequacy decision.
12. Changes to this policy
We may update this policy as the app changes. The date at the top shows when it was last updated, and we will tell you in the app if we make a significant change.
13. Contact
Gas Installers Workmate Ltd, trading as Master Gas
Email: support@mastergas.co.uk