RadiatorOutput vs Heat Engineer
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
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
Read full descriptionHide full description
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.Β 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.
Heat Engineer
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.
- 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
Read full descriptionHide full description
Heat Engineer Software helps heating engineers and surveyors capture property information on site, carry out heat loss surveys and assess air source heat pump sound levels. From a quick estimate to a detailed room-by-room survey (3D LiDAR scanning), gather the information you need for heat pump and conventional heating system design. Work from your iPhone or iPad, then continue with your project in the Heat Engineer desktop platform. ROOM-BY-ROOM HEAT LOSS SURVEYS Capture the property details needed for heat loss calculations designed to follow BS EN 12831-1:2017, the CIBSE Domestic Heating Design Guide and relevant MCS requirements. β’ Create rooms using preset or custom names. β’ Record room dimensions, building materials and construction details. β’ Select materials from the built-in library or enter custom descriptions and U-values. β’ Record walls, floors, windows, doors, ceilings and roofs. β’ Capture complex room shapes and vaulted ceilings using illustrated profiles. β’ Record existing radiator types and dimensions to support emitter assessment. β’ Add photographs of rooms and proposed installation locations. β’ Continue your survey in the desktop platform to review calculations and produce detailed reports. CHOOSE HOW YOU MEASURE Use a tape measure or laser measure and enter your measurements, or use built-in LiDAR scanning on a compatible iPhone or iPad to capture room dimensions and layouts. Choose the survey method that suits the property and the equipment you have available. LiDAR scanning requires a compatible device with a LiDAR sensor. FLOOR PLANS AND LIDAR SCANNING Bring your survey to life with a visual layout of the property. β’ Scan rooms using supported LiDAR devices. β’ View captured rooms and layouts. β’ See room dimensions and radiator locations within your floor plans. β’ Export 2D floor plans to PDF for use alongside your project documentation. WHOLE-HOUSE HEAT LOSS AND QUICK ESTIMATES Assess a property before progressing to a detailed room-by-room survey. Use whole-house heat loss and quick estimation tools to support early discussions, initial project assessments and quotation preparation. Preliminary estimates help you get started. Complete a detailed room-by-room calculation to support final heating system and emitter design. AIR SOURCE HEAT PUMP SOUND ASSESSMENTS Carry out sound assessments to support assessment of the noise requirements associated with permitted development. β’ Record the proposed heat pump manufacturer and model. β’ Enter the manufacturerβs A-weighted sound power level. β’ Record the assessment position and add supporting photographs. β’ Review the assessment result. β’ Return to an assessment to update equipment details or site information. β’ Produce a PDF assessment report for your project records. A sound assessment addresses noise criteria; other planning requirements may also apply. CONNECTED FROM SITE TO DESKTOP Keep your mobile survey and desktop project connected with the updated Heat Engineer platform. Save your work, revisit surveys and assessments, and continue adding information as the project develops. Capture details on site, then use the desktop platform for further design work and reporting. GET STARTED A Heat Engineer account is required. Visit our website to create an account, explore the platform and watch our training videos
Screenshots
Verdict
The clearest difference is in-app purchases: RadiatorOutput at none against Heat Engineer's 1. RadiatorOutput also leads on review sentiment (100% vs 79%) and device support (4 vs 2). Heat Engineer's advantage is update cadence (every 2 months vs every 8 months). On price, ads, monetization model and iOS requirement there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Heat Engineer sells 1 one-off in-app purchase. RadiatorOutput asks for nothing beyond the download.
RadiatorOutput ships an update every 8 months, Heat Engineer every 2 months. The most recent releases landed on September 26, 2026 and October 2, 2026 respectively.
| Parameter | RadiatorOutput | Heat Engineer |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews β better | 78.9% of reviews |
| Update frequency | Every 8 months | Every 2 months β better |
| Ads | No | No |
| In-app purchases | No β better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod, Mac β better | iPhone, iPad |
| Requires iOS | 15.0 β better | 16.4 |
| Further details β not scored | ||
| Size | 1 MB | 203 MB |
| Age rating | 4+ | 4+ |
| Developer | Sebastjan Valic | Heat Engineer Software Ltd |
Customer experience
RadiatorOutput
Heat Engineer
In-app purchases
RadiatorOutput
No in-app purchases
Heat Engineer
- MCS 020 PDF Report Token$2.99
Questions
Is RadiatorOutput free?
Is Heat Engineer free?
Do RadiatorOutput or Heat Engineer have ads?
Which is updated more often, RadiatorOutput or Heat Engineer?
Other comparisons















