Everything in one app

Built for the way
engineers actually work

From the first call to the signed certificate, Heatflow covers every part of the job — on any site, with or without signal.

Start 14-day free trial
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Certificates

Every certificate. Every form. Legally compliant.

Heatflow carries all 15+ Gas Safe forms you'll ever need, each built around the exact fields required by UK regulations. Fill in a CP12, a CP6, a warning notice or a commissioning form in minutes — not on paper, not back at the office.

Every field is validated before you submit, so you never send out a non-compliant certificate. Generate a signed PDF, email it to the landlord or customer, and keep a copy in your job history automatically.

  • CP12 Landlord Gas Safety Records
  • CP6 commercial gas inspection reports
  • Warning notices — At Risk (AR) and Immediately Dangerous (ID)
  • 15+ forms including commissioning, tightness testing and purging
  • PDF generation and email delivery from the app
  • Digital engineer and landlord signatures — no paper needed
  • Guided field-by-field completion with live validation
  • Job history stores every certificate permanently
CP12 Gas Safety Record form in Heatflow
Job workflow screen showing step-by-step job type selection
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Job Management

From first call to signed-off job

Create a job in seconds from a customer call. Everything about that job — the address, appliances, gas readings, photos, notes and certificates — is in one place throughout its lifecycle.

Log work as you go, add site photos, capture gas readings and meter details, and get the customer's digital signature on-site before you leave. No revisiting, no chasing paperwork.

  • Create jobs instantly from customer contact details
  • Log multiple appliances with make, model and serial numbers
  • Capture site photos attached directly to the job
  • Record gas readings and meter details on-site
  • Step-by-step job completion workflow
  • Customer digital sign-off captured on your phone
  • Automatic job history and audit trail
  • Link certificates and invoices to the same job
Offline Mode — Our biggest differentiator

Full functionality.
No signal required.

Every other gas engineer app fails on-site. Heatflow is built offline-first from the ground up — not bolted on as an afterthought.

How the sync works

1
Download before you leave
Heatflow syncs your full job list, customer data, appliance records and fault guides overnight — or whenever you open the app on Wi-Fi.
2
Work normally all day
On-site, underground, rural — it doesn't matter. Create jobs, complete certificates, log readings and capture photos exactly as normal.
3
Auto-sync on reconnect
The moment your phone picks up any signal — even a weak 4G bar — your data uploads. No manual action, no lost work, no duplicates.

Available without any connection

✓ All jobs & job history
✓ Certificates & forms
✓ Customer & property data
✓ Appliance records
✓ Fault code reference
✓ Gas reading tools
✓ Photos & attachments
✓ Quotes & invoices
  • No connection required to complete a CP12 or any other certificate
  • Photos queue and upload in background when signal returns
  • Conflict resolution built in — no duplicate jobs or data loss
  • Lightweight sync — won't eat your mobile data plan
  • Works in full airplane mode, airplane mode + Wi-Fi, and intermittent 4G
OFFLINE MODE ACTIVE
✈ Airplane
Active jobs 6 jobs ✓
Certificates 14 forms ✓
Customer data 124 records ✓
Fault guides All guides ✓
Photos Queued (3) ✓
LAST SYNCED 07:32 this morning
3 items pending upload

"Half my jobs are on new builds with no signal. I can complete a full CP12 in the basement and it uploads when I step outside."

Sarah Nkosi — Heating engineer, Birmingham
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Quotes & Invoices

Professional paperwork. Done on-site.

Build a professional, itemised quote on your phone while the customer is still with you. Add labour, parts and VAT, preview it, and email a PDF in seconds — before you've packed your tools.

When the job is approved, convert the quote directly to an invoice in one tap — all the data carries across, no re-entering anything.

  • Build itemised quotes on-site with labour and parts
  • VAT calculation — 5% reduced rate and 20% standard
  • Professional branded PDF sent directly from the app
  • Convert a quote to an invoice in a single tap
  • Email invoices directly from the app
  • Job history keeps full quote-to-invoice audit trail
  • No duplicate data entry across quote and invoice
Quote builder screen showing customer details and line items
AI Fault Diagnosis screen showing symptom input and diagnostic steps
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AI Fault Diagnosis

When the fault doesn't make sense

Describe what you're seeing in plain English and Heatflow gives you a structured troubleshooting path — covering UK boiler faults. It's a second opinion on a tricky fault, right there on-site.

The guidance is informed by common fault patterns across the appliance types you work on every day. It will never replace your Gas Safe training and expertise — but it helps you think through an unusual fault systematically rather than blindly.

Important: AI fault guidance is for reference only. All diagnostic decisions remain the responsibility of the qualified engineer. Never act on AI guidance alone for unsafe situations.

  • Describe symptoms in plain English — no codes needed
  • Structured troubleshooting steps, in order of likelihood
  • Covers common UK boiler faults
  • 30 diagnoses per month included on all plans
  • Works with or without a fault code
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CP12 Renewal Reminders

Never miss a landlord renewal

For sole traders managing a portfolio of landlord properties, a missed CP12 renewal is a failed inspection, a fine and a damaged relationship. Heatflow tracks every renewal automatically and pushes you a reminder before it's due.

When the reminder lands, booking the job takes one tap. No spreadsheets. No sticky notes. No late Friday panic calls from a letting agent.

  • Automatic expiry tracking for every CP12 you issue
  • Push notification 60, 30 and 7 days before expiry
  • Full landlord portfolio view — sort by soonest expiry
  • One-tap to create the renewal job from the reminder
  • Overdue certificates flagged in red — always visible
  • Landlord email notification option on each renewal
CP12 RENEWALS
14 Birchwood Cl, Leeds
6d left
7 Ash Lane, Harrogate
18d left
22 Mill St, Bradford
34d left
3 Elmfield Ave, York
51d left
88 Park Dr, Sheffield
72d left
⚠ 1 renewal due in 6 days
dashboard.heatflow.co.uk
Heatflow owner dashboard showing live jobs, certificate approvals and revenue
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Company Accounts

Built for teams, not just sole traders

When you hire your first engineer, your admin load doubles — if you don't have the right tools. The Heatflow Company plan gives you a web dashboard where you can see every job, every certificate and every engineer in real time.

Assign jobs to specific engineers, approve certificates before they go to customers, and run reports on performance and revenue — all without picking up the phone.

  • Up to 5 engineers on one Company plan★
  • Owner web dashboard at app.heatflow.app
  • Live view of all active jobs and engineer status
  • Assign jobs to individual engineers
  • Certificate approval workflow before customer delivery
  • Company-wide analytics and revenue reporting
  • CP12 compliance tracker for full landlord portfolio
  • Unsafe situation alerts in real time

★ Tailored plans for larger teams — contact us for a custom seat quote.

See the full Company plan
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Data & Security

Your data. Always yours.

Customer records, gas safety certificates and engineer data are sensitive. We treat them that way — with end-to-end encryption, GDPR-compliant data handling and UK-based data residency.

You own your data. You can export everything, and you can request deletion at any time. We will never sell it, and we will never use it for any purpose other than running Heatflow for you.

  • GDPR compliant — UK ICO registered data handling
  • Encrypted in transit (TLS 1.3) and at rest (AES-256)
  • UK data residency — your data never leaves the UK
  • Full data export — jobs, certs, customers, everything
  • Account deletion — complete and permanent on request
  • Certificate audit trail — tamper-evident record keeping
  • No advertising. No selling your data. Ever.
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UK Data Residency
Your data is stored in UK data centres. It never leaves UK jurisdiction.
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End-to-End Encryption
TLS 1.3 in transit. AES-256 at rest. Every field, every file.
⚖️
GDPR Compliant
UK ICO registered. Full subject access, portability and deletion rights.
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Your Data, Yours to Keep
Export all your data at any time in standard formats. No lock-in.

See it for yourself.
14 days free.

Every feature, from day one. No credit card required. Cancel anytime.

Download on the App Store View pricing →

Gas Safe compliant · GDPR ready · Offline-first · UK support