Comparison

Oventrop vs Combi Valve Sizer

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

Combi Valve Sizer

This app simplifies the selection of specific HVAC components. It guides users through choosing the correct valve and actuator, calculates flow rates, and assists with presetting and commissioning. Users can also tag components and download reports.

Highlights
  • Guided valve and actuator selection
  • Valve sizing and flow calculation
  • Valve presetting calculation
  • Tagging valve location and designation
  • Commissioning check with reports
  • Data sheet downloads
  • Report sharing
Read full description

Combi Valve Sizer app from Siemens helps to select the right Acvatix PICV (combi valve) and matching actuator easily. Features: - Guided valve and actuator selection - Valve sizing - Calculation of maximum volumetric flow - Calculation of valve presetting - Tagging the valve location and designation - Commissioning check with report - Data sheets download - Sharing of reports and documents

Screenshots

Oventrop4 screens
Combi Valve Sizer4 screens

Verdict

The call

The clearest difference is review sentiment: Oventrop at 44% against Combi Valve Sizer's 0%. Oventrop also leads on update cadence (monthly vs every 9 months). Combi Valve Sizer's advantage is iOS requirement (7.0 vs 15.6). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Oventrop ships an update monthly, Combi Valve Sizer every 9 months. The most recent releases landed on September 10, 2026 and June 10, 2026 respectively.

Scorecard3 real differences · 7 level
Oventrop versus Combi Valve Sizer: the parameters behind the verdict, then further details
ParameterOventropCombi Valve Sizer
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews44.4% of reviews — better0.0% of reviews
Number of ratings1 — better—
Update frequencyMonthly — betterEvery 9 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.67.0 — better
Further details — not scored
Size48 MB50 MB
Age rating4+4+
DeveloperOventrop GmbH & Co. KGSiemens AG

Customer experience

Oventrop

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews18 reviews
Positive44.4%
Neutral22.2%
Negative33.3%

Combi Valve Sizer

Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Oventrop

No in-app purchases

None

Combi Valve Sizer

No in-app purchases

Questions

Is Oventrop free?
Oventrop is free to download, with no in-app purchases.
Is Combi Valve Sizer free?
Combi Valve Sizer is free to download, with no in-app purchases.
Do Oventrop or Combi Valve Sizer have ads?
Neither Oventrop nor Combi Valve Sizer shows ads.
Which is updated more often, Oventrop or Combi Valve Sizer?
Oventrop ships an update monthly, and Combi Valve Sizer every 9 months. Most recently, Oventrop was updated on September 10, 2026 and Combi Valve Sizer on June 10, 2026.

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