Oventrop vs RadiatorOutput
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Oventrop
This app assists with the design, calculation, and documentation of hydronic balancing for heating systems. It supports various standards and regulations, enabling users to calculate valve presets, heating loads, and radiator sizes. Documentation can be generated in PDF format or printed wirelessly.
- Project design with calculations (VdZ, BEG)
- Heating check according to EnSimiMaV and DIN SPEC 15378
- OV-DMC 3 measuring system integration
- Simplified heating load calculation (DIN 12831)
- DIN radiator and thermostatic valve sizing
- ErP energy efficiency label creation
- PDF documentation and wireless printing
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Functions: • Project design incl. calculations for procedure A or B (VdZ, BEG) • Heating check according to EnSimiMaV und DIN SPEC 15378:2018-08 • OV-DMC 3 measuring system for adjustment/control measurement in heating and cooling systems • With valve identification for the new double regulating valves HydroControl and HydroCom • Simplified heating load calculation according to DIN 12831 • DIN radiator sizing (existing or new) • Sizing of thermostatic valves • Sizing of double regulating valves • Creation of ErP energy efficiency label • Unit converter • Oventrop News • Oventrop Contact Oventrop GmbH & Co. KG offers an app to support the execution and documentation of the hydronic balancing of heating systems. Whether on the construction site, at a consultation appointment or in the office, users of the OVapp can calculate the preset values of the Oventrop thermostatic valves and regulating and pipeline valves at any time with their smartphone or tablet and thus easily carry out the hydronic balancing of heating systems. In addition, a simplified heating load calculation according to DIN EN 12831-B3 or a radiator sizing with DIN radiators is integrated. The OVapp can be used to fulfil the requirements of procedure A and B of the VdZ form (individual measure) for hydronic balancing within the framework of the Federal Funding for efficient buildings (BEG) for existing buildings - procedure B is possible when using the Q-Tech thermostatic valves with flow control. The calculations can be documented using a PDF file or WLAN printer. The VdZ form is filled out automatically according to the designs. Furthermore, the OV-DMC 3 measuring system for the adjustment and control of heating and cooling systems is integrated. Pressure measurements can be carried out easily with the OVapp and the measuring sensor, flow values can be determined and presettings for the desired volume flows can be determined. With the ErP wizard there is the possibility to create ErP energy efficiency labels as composite labels for Oventrop products in the field of solar thermal energy. Furthermore, an extensive manufacturer product database of the VdZ with ErP-relevant products can be accessed.
RadiatorOutput
Calculate radiator heat output based on water and air temperatures. Ensure optimal energy efficiency and cost savings by selecting the correct radiator size for any heating system, including those with low water temperatures. Supports metric units and can also calculate cooling output for convectors and fan-coils.
- Calculate radiator heat output
- Adjust for water and air temperatures
- Optimize energy efficiency
- Supports low water temperature systems
- Calculate cooling output
- Metric units only
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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.
Screenshots
Verdict
The clearest difference is review sentiment: RadiatorOutput at 100% against Oventrop's 44%. Oventrop's advantage is update cadence (monthly vs every 8 months). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Oventrop ships an update monthly, RadiatorOutput every 8 months. The most recent releases landed on September 29, 2026 and September 26, 2026 respectively.
| Parameter | Oventrop | RadiatorOutput |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 44.4% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 — better | — |
| Update frequency | Monthly — better | Every 8 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 48 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Oventrop GmbH & Co. KG | Sebastjan Valic |
Customer experience
Oventrop
RadiatorOutput
In-app purchases
Oventrop
No in-app purchases
RadiatorOutput
No in-app purchases








