# Heat Engineer vs Caleffi Pipe Sizer

The clearest difference is in-app purchases: Caleffi Pipe Sizer at none against Heat Engineer's 1. Caleffi Pipe Sizer also leads on iOS requirement (13.0 vs 15.6). Heat Engineer's advantage is review sentiment (79% vs 50%) and update cadence (every 2 months vs every 7 months). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. Heat Engineer sells 1 one-off in-app purchase. Caleffi Pipe Sizer asks for nothing beyond the download.

Heat Engineer ships an update every 2 months, Caleffi Pipe Sizer every 7 months. The most recent releases landed on August 5, 2026 and June 25, 2026 respectively.

## The numbers

| Metric | Heat Engineer | Caleffi Pipe Sizer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/caleffi-pipe-sizer/id1088928458/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | **78.9% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 7 months |
| Monetization | Free | Free |
| Size | 44 MB | 44 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) | [Caleffi S.p.A](https://appshunter.io/developer/920722440) |

## 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 |


### Caleffi Pipe Sizer

[App page](https://appshunter.io/ios/app/caleffi-pipe-sizer/id1088928458)

This application assists hydraulic and HVAC professionals in accurately sizing water or air pipes. It calculates pressure drops and offers a modern, intuitive interface for precise system design on the go.

**Highlights:** Accurate water/air pipe sizing, Pressure drop calculation, Customizable technical parameter calculations, Extensive material and configuration library, Modern and intuitive interface, Enhanced performance

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Heat Engineer free?

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

### Is Caleffi Pipe Sizer free?

Caleffi Pipe Sizer is free to download, with no in-app purchases.

### Do Heat Engineer or Caleffi Pipe Sizer have ads?

Neither Heat Engineer nor Caleffi Pipe Sizer shows ads.

### Which is updated more often, Heat Engineer or Caleffi Pipe Sizer?

Heat Engineer ships an update every 2 months, and Caleffi Pipe Sizer every 7 months. Most recently, Heat Engineer was updated on August 5, 2026 and Caleffi Pipe Sizer on June 25, 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.*