Getting Started — Heatflow

Download the app and create your account

Download Heatflow from the App Store on your iPhone.
Open the app and tap "Create account". Enter your name, email address, and a secure password.
You'll receive a confirmation email — tap the link to verify your address.
Enter your Gas Safe registration number. This is required to generate legally compliant certificates.

Add your company name and trading address. This appears on all certificates and invoices you generate.
Upload your Gas Safe card photo — this is embedded in CP12s and other certificates.
Set your default VAT rate if you are VAT-registered (standard UK rate is 20%). You can change this per-invoice at any time.
Add your bank account details for invoices (sort code and account number are displayed in the invoice footer).
Optionally upload your company logo for branded PDFs.

Tap "Customers" in the bottom navigation and tap the + button.
Enter the customer's name and contact details.
Add their property address — you can add multiple properties per customer (common for landlords with multiple rentals).
Save the customer. They'll appear in your customer list for all future jobs.

Tap "Jobs" and tap the + button to create a new job.
Select the customer and property from your list, or add a new one on the fly.
Choose the job type (service, installation, repair, etc.) and add any notes.
On-site, you can log appliance details — make, model, serial number, gas readings.
Capture photos directly within the job — these are stored securely and attached to the job record.
Tap "Complete job" when done. The engineer or customer can sign off on-screen.

From within a completed job, tap "Generate certificate".
Select the certificate type — CP12 (Landlord Gas Safety Record) is the most common.
Heatflow pre-fills the form with your profile data, appliance details, and gas readings from the job.
Review and complete any remaining fields. The app flags anything required by Gas Safe.
Tap "Generate PDF". Your certificate is created instantly.
Email it to the landlord, tenant, or customer directly from the app — or save it for later.

Heatflow downloads all your customer data, job history, and certificate templates before you leave home.
You have full functionality in basements, new builds, rural sites — anywhere without signal.
All data is saved locally on your device as you work.
The moment you reconnect to Wi-Fi or mobile data, Heatflow automatically syncs everything to the cloud.
No manual sync required — it just works.

Something not working? Email us at support@heatflow.app — we reply within one working day.