# Heat Engineer vs Boiler Fault Codes

The clearest difference is review sentiment: Heat Engineer at 79% against Boiler Fault Codes's 14%. Heat Engineer also leads on price (Free vs $4.99). Boiler Fault Codes's advantage is in-app purchases (none vs 1) and iOS requirement (13.0 vs 15.6). On update cadence, ads and device support there is nothing between them.

Heat Engineer is free to download; Boiler Fault Codes costs $4.99 up front. Heat Engineer sells 1 one-off in-app purchase. Boiler Fault Codes asks for nothing beyond the download.

Heat Engineer ships an update every 2 months, Boiler Fault Codes every 3 months. The most recent releases landed on August 5, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Heat Engineer | Boiler Fault Codes |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Positive reviews | **78.9% of reviews** | 14.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | **Free** | Paid |
| Size | 44 MB | 23 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Heat Engineer Software Ltd](https://appshunter.io/developer/1461678894) | [Mr Combi Training](https://appshunter.io/developer/566867832) |

## What reviewers say

### Heat Engineer

[App page](https://appshunter.io/ios/app/heat-engineer/id879510552)

This app assists heating engineers and surveyors in collecting property data for heating system installations. It supports heat loss reports for various technologies and includes tools for sound assessments and quick estimations. Data is automatically saved for later review and amendment.

**Highlights:** Heat loss survey for BS EN 12831, CIBSE, and MCS standards, MCS 020 sound assessment for Air Source Heat Pumps, Quick heat loss estimator tool, Automatic data saving and history for amendments, Room-by-room heat loss calculation, Photo capture for rooms and installation locations, Fuel comparisons and running cost calculations

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MCS 020 PDF Report Token | $2.99 | one-time |


### Boiler Fault Codes

[App page](https://appshunter.io/ios/app/boiler-fault-codes/id1545965490)

Quickly diagnose boiler faults without a manual. Access a comprehensive database of fault codes, causes, and solutions for popular UK boiler models. Includes manufacturer contact details for immediate assistance.

**Highlights:** Extensive fault code database, Causes and solutions for errors, Flow charts for diagnostics, Manufacturer contact details, Offline functionality, Pinch-to-zoom display

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Heat Engineer free?

Heat Engineer is free to download, with in-app purchases available.

### Is Boiler Fault Codes free?

Boiler Fault Codes costs $4.99, with no in-app purchases.

### Do Heat Engineer or Boiler Fault Codes have ads?

Neither Heat Engineer nor Boiler Fault Codes shows ads.

### Which is updated more often, Heat Engineer or Boiler Fault Codes?

Heat Engineer ships an update every 2 months, and Boiler Fault Codes every 3 months. Most recently, Heat Engineer was updated on August 5, 2026 and Boiler Fault Codes on September 20, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*