# MAGCalc: Expansion Vessel — Sizing, pressure and projects

> Sizing, pressure and projects (iPhone/iPad app by Piotr Kaminski.)

- Source: https://appshunter.io/ios/app/magcalc-expansion-vessel/id6801678865 (this page in markdown: same URL + `.md`)
- Developer: [Piotr Kaminski](https://appshunter.io/developer/6799375980)
- Category: Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English, German (Germany)
- Released: 2026-08-22
- Data updated: 2026-10-24

## What is MAGCalc?

MAGCalc helps heating and HVAC technicians size membrane expansion vessels and prepare precharge and filling pressures.

WATER SIZING
Record system volume, temperature, static height and safety valve pressure. Estimate water expansion and view the next standard vessel size.

INSTALLATIONS AND SCENARIOS
Save named installation projects with location notes. Create and duplicate independent scenarios, select a reference and compare results. Keep input sources and assumptions with each scenario. Share a calculation record containing inputs, results and differences.

German and English. Calculations and local projects work offline.

MAGCalc Pro unlocks manual expansion calculations for glycol, solar fluids and special media through a one-time in-app purchase. Water sizing and project management are available without that additional purchase.

Professional calculation aid: manufacturer data, applicable rules, system design and actual measurements take precedence. Check results against the real installation.

EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| MAGCalc Pro | $3.99 | one-time |


## Is MAGCalc safe?

Not enough ratings yet to assess MAGCalc.

## Is MAGCalc legit?

MAGCalc: Expansion Vessel appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for MAGCalc is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.1.0 — 2026-10-21

New installation projects with sources and notes. Save and duplicate water-sizing scenarios, compare against a selected baseline and share full calculation records.

### 1.0.0 — 2026-08-22

No release notes.

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## More apps by Piotr Kaminski

- [BrennerCalc: Burner & HVAC](https://appshunter.io/ios/app/brennercalc-burner-and-hvac/id6801656652)
- [HydroCalc: Heating & Flow](https://appshunter.io/ios/app/hydrocalc-heating-and-flow/id6801788464)
- [KeepMeter: Returns & Cost](https://appshunter.io/ios/app/keepmeter-returns-and-cost/id6803227186)
- [NavoTap](https://appshunter.io/ios/app/navotap/id6803636049)
- [Kamilunavo Trace: Nachweise](https://appshunter.io/ios/app/kamilunavo-trace-nachweise/id6803765449)

All apps by Piotr Kaminski: https://appshunter.io/developer/6799375980

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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 2026-10-24.*