# GB Gas Flue & Spillage testing — All Flue Testing Checks

> All Flue Testing Checks (iPhone/iPad app by GB-GAS.CO.UK.)

- Source: https://appshunter.io/ios/app/gb-gas-flue-and-spillage-testing/id431647397 (this page in markdown: same URL + `.md`)
- Developer: [GB-GAS.CO.UK](https://appshunter.io/developer/425897007)
- Category: Business, Education
- Price: $4.99
- Age rating: 4+
- Requires: iOS 26.0 · 77 MB
- Languages: American English
- Released: 2011-04-19
- Data updated: 2026-08-28
- User reviews in markdown: https://appshunter.io/ios/app/gb-gas-flue-and-spillage-testing/id431647397/reviews.md

## What is GB Gas Flue & Spillage testing?

Flue Integrity testing flue pull and Appliance Spillage testing
Selection of testing methods for best practice. Use the timer to remind you when the heating process is finished. The process will then tell you what the next step is more heat or fail, When to open doors and turn on fans, when to add more ventilation to the room.
Part of the testing for series for new entrants or for experienced engineers.

Combustion Performance Analysis and Flue Gas Analysis tools to the GB-GAS app.

The app now includes BS 7967-3 CO/CO₂ ratio checks for a range of gas appliances, with enhanced testing for boilers including High Fire, optional Low Fire, manufacturer data comparison and Flue Integrity testing.

Additional features include heat input recording, O₂ level warnings, automatic CO/CO₂ ratio calculations, positive-pressure appliance spillage testing, and an easy-to-use appliance reference list.

Existing flue integrity and appliance spillage tests have also been retained, making this a much more complete tool for gas appliance combustion and safety checks.


## Version history (last 5 releases)

### 4 — 2026-08-28

This is a major update to the GB-GAS Smoke and Spillage Testing app.

New features include combustion performance analysis, appliance specific ratio checking, enhanced boiler testing, manufacturer data comparison, high and low fire testing, heat input recording and flue integrity testing.

Positive pressure appliance spillage testing has also been added, together with an easy to use appliance reference list.

The app now provides clearer test results, additional guidance when readings require further investigation and improved support for a wider range of gas appliances.

Existing flue integrity and appliance spillage testing features have been retained and updated.

This release significantly expands the app into a more complete combustion, flue and appliance safety testing tool for gas engineers.

### 3 — 2020-07-20

Minor updates to maintain operation

### 2.2 — 2017-01-06

Updates for new IOS System

### 2.1 — 2014-01-16

minor glitch fix for ipad

### 2 — 2012-09-27

updates for new iOS 6

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## More apps by GB-GAS.CO.UK

- [GB Gas Heat Input Calculator](https://appshunter.io/ios/app/gb-gas-heat-input-calculator/id426032737)
- [GB Gas Ventilation Calculator](https://appshunter.io/ios/app/gb-gas-ventilation-calculator/id426220160)
- [GB Gas Purging Calculator](https://appshunter.io/ios/app/gb-gas-purging-calculator/id426227084)
- [GB Gas Pipe Sizing Calculator](https://appshunter.io/ios/app/gb-gas-pipe-sizing-calculator/id427457719)
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- [GB Gas Tightness NG + LPG](https://appshunter.io/ios/app/gb-gas-tightness-ng-plus-lpg/id430236121)

All apps by GB-GAS.CO.UK: https://appshunter.io/developer/425897007

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*