# RadiatorOutput — Radiator sizing app

> Calculate radiator heat output for optimal heating system efficiency. (iPhone/iPad app by Sebastjan Valic.)

- Source: https://appshunter.io/ios/app/radiatoroutput/id503687382 (this page in markdown: same URL + `.md`)
- Developer: [Sebastjan Valic](https://appshunter.io/developer/503687385)
- Category: Productivity, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 1 MB
- Languages: American English, French (France), German (Germany), Italian, Slovenian
- Released: 2012-02-24
- Data updated: 2026-08-27
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/radiatoroutput/id503687382/reviews.md

## What is RadiatorOutput?

Quickly calculate a radiator's heat output at different water and air temperatures.

Select the radiator that fits, based on heat losses and water temperature. Don't undersize or oversize and ensure the best energy efficiency possible. 

Low water temperature (e.g. with heat pump as heat generator) can greatly increase energy efficiency and keep the cost down, but it still needs to provide enough heat to keep the room or the building warm. That's why larger radiators are needed in such cases. Find out exactly how large quickly using this app. Anywhere, anytime, fast and simple.

** Note: metric units only.

*** This app is totally free - no ads, no in-app purchases. No account needed, no log-ins, no user data needed nor collected. ***


A radiator's heat output is highly dependent on temperature of water entering and leaving the radiator. Nominal heat output of a radiator can be found in a catalogue or a technical brochure. The nominal heat output is valid only at the conditions specified in the catalogue. This application will calculate the heat output of the selected radiator at conditions specified by the user. This is useful for the selection of the right size of a radiator when designing a new heating system, as modern heating systems tend to use lower water temperatures than those specified in catalogues. The reason is simple: lower temperatures mean higher energy efficiency and lower cost. The application can also be used for calculating the cooling output of convectors and fan-coils at various conditions.

The application is available in English, French, German and Italian languages.

The application does not contain ads.

## Key features

- Calculate radiator heat output
- Adjust for water and air temperatures
- Optimize energy efficiency
- Supports low water temperature systems
- Calculate cooling output
- Metric units only

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/radiatoroutput/id503687382/reviews.md

### 5/5 — Guter Job

*2017-11-23*

Sehr behilflich und praktisch. Zudem ist die App Kostenlos.

## Frequently asked questions about RadiatorOutput

### What is RadiatorOutput used for?

RadiatorOutput is used to quickly calculate a radiator's heat output at different water and air temperatures. This helps ensure you select the correct radiator size for optimal energy efficiency and cost savings in your heating system.

### Does RadiatorOutput support imperial units?

No, RadiatorOutput currently only supports metric units for all calculations. This is noted in the app's description.

### Can RadiatorOutput calculate cooling output?

Yes, in addition to heat output, the application can also be used for calculating the cooling output of convectors and fan-coils at various conditions.

### Is RadiatorOutput free to use?

Yes, RadiatorOutput is completely free to use. The app explicitly states it has no ads, no in-app purchases, and requires no account or log-ins.

### What languages is RadiatorOutput available in?

RadiatorOutput is available in English, French, German, and Italian languages, making it accessible to a wider range of users.

### How often is RadiatorOutput updated?

The app was last updated on November 2, 2022, with the latest version being 2.5. This indicates a reasonable update frequency for a utility application.

### What devices can I use RadiatorOutput on?

RadiatorOutput is supported on Mac, iPhone, iPad, and iPod devices, offering broad compatibility across Apple's ecosystem.

### Does RadiatorOutput collect user data?

No, RadiatorOutput does not collect or require any user data. It explicitly states that no account is needed, no log-ins are required, and no user data is collected or needed.

## Version history (last 5 releases)

### 2.5 — 2022-11-02

Corrected link in help.
Updated for newer OS versions.

### 2.3 — 2021-04-15

Small changes.

### 2.2 — 2020-10-28

- Small fixes;
- New icon.

### 2.1 — 2020-02-01

Dark mode.

### 2.0 — 2019-06-14

- Support for newer devices;

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## More apps by Sebastjan Valic

- [Floor Heating](https://appshunter.io/ios/app/floor-heating/id507609113)
- [Heating Pipe Size](https://appshunter.io/ios/app/heating-pipe-size/id527730872)
- [Hydraulic Separator](https://appshunter.io/ios/app/hydraulic-separator/id538932932)
- [Natural Gas Pipe Size](https://appshunter.io/ios/app/natural-gas-pipe-size/id538945071)
- [Heating Cost: compare systems](https://appshunter.io/ios/app/heating-cost-compare-systems/id548038714)

All apps by Sebastjan Valic: https://appshunter.io/developer/503687385

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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 2026-08-27.*