Heat Engineer vs Assess+
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
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Heat Engineer has been designed to help heating engineers and surveyors gather information about a property for the installation of a heating system. The options available for heat loss reports are renewable technologies such as Air Source Heat Pumps, Ground Source Heat Pumps, Biomass or conventional fossil fuels. Please visit our website to create an account and watch our training videos. www.heat-engineer.com Heat Engineer Software Ltd is an Industrial Associate Supporter of the Chartered Institute of Plumbing & Heating Engineering. ----Heat Engineer has three functions ---- 1 - Heat Loss survey, designed to meet BS EN 12831, CIBSE Domestic Heating Design Guide and MCS standards. When the survey is completed you can send it to your account at www.heat-engineer.com 2 - MCS 020 Planning Standards, sound assessment for Air Source Heat Pumps. 3 - A quick heat loss estimator tool. -----Important useful feature---- Every entry made is automatically saved in the app’s history so you can revisit any time to amend either your sound assessment or heat loss survey. For MCS 020 Sound assessments this is particularly useful if you don’t know the sound power decibel rating whilst on site and haven’t yet decided which manufacturer to use. You can use the app on site to record data you have and revisit your history to update the project once you’re back in the office. We now have a LiDAR feature. 1----Heat Loss Survey---- Complete a site survey for a room by room heat loss calculation. The parameters within this app are detailed so calculations can be carried out following the domestic heating design guide and requirements to meet MCS standards. This tool is for collecting details of a property so you can then send it to an online Heat Engineer account. If you are a Heat Engineer account holder at www.heat-engineer.com then you can review your survey and produce a detailed heat loss report. Take photos for each room and installation locations. • Pre-populated drop down lists for room names and options to add custom names. • Pre-populated drop down lists and options to add custom description and U values for all building materials, walls, floors, windows, doors, ceilings and roof. • For ‘complex rooms’, rooms with lofted/vaulted ceilings and roof an option to select which image profile, so measurement and wall types can quickly be entered. • Current Emitter selection, quickly select the radiator profile image from our list and enter the height and length. Heat Engineer online www.heat-engineer.com will calculate the output based on the designed flow temperature in the final report. • Send completed survey to a Heat Engineer account online at www.Heat-Engineer.com • Surveys submitted for the heat loss calculation the ‘internal room design temperatures’ and ‘air changes per hour ‘will be based on the room name and age of the room. Energy kWh demand and running costs is calculated using degree day data. Fuel comparisons are also available. 2----MCS 020 Planning Standards, sound assessment for Air Source Heat Pumps- To ensure a proposed Air Source Heat Pump installation is a ‘permitted development’ for sound conditions use this app if you’re an MCS installer for the handover pack. • Enter any manufacturer and model name • Enter the A weighted sound power (dB) level for the chosen model (you can change this information in the history when you decide which model you want to install) • Enter a description of assessment position • Take and add a photo of the assessment position for your final PDF report • A clear indication of assessment results • Send a two page PDF report of the completed MCS 020 assessment to your office via email 3----Heat Loss Estimator---- This heat loss estimator tool has been designed to provide heating estimations on Power kW and Energy kWh demands for domestic and commercial properties. The tool provides approximations to aid the quotation / tendering process before a project is accepted.
Assess+
This app streamlines on-site data collection for property assessment professionals. It integrates with PAS Hub and Assessor Hub platforms to support various assessment types, generating compliance documentation.
- PAS Hub integration
- Assessor Hub integration
- Retrofit Assessment support
- EPC completion
- Legionella Report generation
- On-site data collection
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Assess+ is the companion application to the Cotality UK PAS Hub and ecmk Assessor Hub platforms. It's designed to support professionals across the retrofit and property assessment industry by providing efficient on-site data collection for a range of assessment types. Assess+ supports the following features: PAS Hub Integration - Complete Retrofit Assessments, Technical Surveys, Installation Surveys, and RC Site Visits for submission to PAS Hub. This will generate compliance documentation for the relevant standards, such as for PAS 2030/2035 and TrustMark Licence Plus, as well as cover funding-specific requirements, such as the ECO Reporting Working Group documents. Assessor Hub Integration - Complete EPCs and Legionella Reports for submission to Assessor Hub. Note that you must be accredited with ecmk to complete the following assessment types and access to Assess+ will be provided as part of your onboarding: Retrofit Assessment EPC Legionella Report About Cotality: Empowering the Property Services Industry through Technology, Data and Connectivity. Mobile surveying and workflow management software, combined with data and analytical insights, supporting the UK property services industry. Solutions that help to streamline operations,enhance productivity, enable smarter decision making and mitigate property-related risk.
Screenshots
Verdict
The clearest difference is review sentiment: Heat Engineer at 79% against Assess+'s 14%. Assess+'s advantage is in-app purchases (none vs 1). On price, update cadence, ads 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. Heat Engineer sells 1 one-off in-app purchase. Assess+ asks for nothing beyond the download.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on August 5, 2026 and August 17, 2026 respectively.
| Parameter | Heat Engineer | Assess+ |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 78.9% of reviews — better | 14.3% of reviews |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 16.0 |
| Further details — not scored | ||
| Size | 44 MB | 140 MB |
| Age rating | 4+ | 4+ |
| Developer | Heat Engineer Software Ltd | CoreLogic U.K. Limited |
Customer experience
Heat Engineer
Assess+
In-app purchases
Heat Engineer
- MCS 020 PDF Report Token$2.99
Assess+
No in-app purchases
Questions
Is Heat Engineer free?
Is Assess+ free?
Do Heat Engineer or Assess+ have ads?
Which is updated more often, Heat Engineer or Assess+?
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