# Gas Pipe Sizing Calculator vs Heat Engineer

The clearest difference is price: Heat Engineer at Free against Gas Pipe Sizing Calculator's $4.99. Heat Engineer also leads on review sentiment (79% vs 43%). Gas Pipe Sizing Calculator's advantage is in-app purchases (none vs 1) and iOS requirement (11.0 vs 16.4). On update cadence, ads and device support there is nothing between them.

Heat Engineer is free to download; Gas Pipe Sizing Calculator costs $4.99 up front. Heat Engineer sells 1 one-off in-app purchase. Gas Pipe Sizing Calculator asks for nothing beyond the download.

Gas Pipe Sizing Calculator ships an update every 3 months, Heat Engineer every 2 months. The most recent releases landed on October 23, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Gas Pipe Sizing Calculator | Heat Engineer |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/gas-pipe-sizing-calculator/id570414217/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 42.9% of reviews | **78.9% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 1 MB | 306 MB |
| Requires iOS | **11.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mr Combi Training](https://appshunter.io/developer/566867832) | [Heat Engineer Software Ltd](https://appshunter.io/developer/1461678894) |

## What reviewers say

### Gas Pipe Sizing Calculator

[App page](https://appshunter.io/ios/app/gas-pipe-sizing-calculator/id570414217)

This app helps installers select the correct gas pipe sizes for boiler installations. It calculates the minimum required pipe diameter and pressure drop based on gas type, appliance input, pipe length, and fittings. Supports copper, steel, and PE pipes.

**Highlights:** Select pipe size based on gas type, Enter appliance heat input, Specify pipe length and fittings, Supports copper, steel, and PE pipes, Calculates minimum pipe diameter, Shows pressure drop for pipe sections

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Gas Pipe Sizing Calculator free?

Gas Pipe Sizing Calculator costs $4.99, with no in-app purchases.

### Is Heat Engineer free?

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

### Do Gas Pipe Sizing Calculator or Heat Engineer have ads?

Neither Gas Pipe Sizing Calculator nor Heat Engineer shows ads.

### Which is updated more often, Gas Pipe Sizing Calculator or Heat Engineer?

Gas Pipe Sizing Calculator ships an update every 3 months, and Heat Engineer every 2 months. Most recently, Gas Pipe Sizing Calculator was updated on October 23, 2026 and Heat Engineer on October 18, 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.*