Comparison

Heat Engineer vs Boiler Fault Codes

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

Head to head
About

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.

Highlights
  • 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
Features
Read 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. • Create rooms using preset or custom names. • Record room dimensions, building materials and construction details. • Select materials from the built-in library or enter custom descriptions and U-values. • Record walls, floors, windows, doors, ceilings and roofs. • Capture complex room shapes and vaulted ceilings using illustrated profiles. • Record existing radiator types and dimensions to support emitter assessment. • Add photographs of rooms and proposed installation locations. • 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. • Scan rooms using supported LiDAR devices. • View captured rooms and layouts. • See room dimensions and radiator locations within your floor plans. • 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. • Record the proposed heat pump manufacturer and model. • Enter the manufacturer’s A-weighted sound power level. • Record the assessment position and add supporting photographs. • Review the assessment result. • Return to an assessment to update equipment details or site information. • 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

About

Boiler Fault Codes

Quickly diagnose boiler faults without a manual. Access a comprehensive database of fault codes, causes, and solutions for popular UK boiler models. Includes manufacturer contact details for immediate assistance.

Highlights
  • Extensive fault code database
  • Causes and solutions for errors
  • Flow charts for diagnostics
  • Manufacturer contact details
  • Offline functionality
  • Pinch-to-zoom display
Features
Read full description

Do you ever get to a customer’s house, their boiler is showing a fault code and there’s no servicing manual in sight? With our app you won’t need to hunt for the manual, you can quickly find the cause of the error and get cracking with fixing the problem. Our Boiler Fault Codes app is jam packed with fault codes for the most popular boilers and manufacturers in the UK... • Around 100 boiler models • 17 boiler manufacturers • Fault causes and/or possible solutions provided by the manufacturers • Flow charts for some manufacturers • Easy to understand instructions • High quality fault code documents • Easy to use, pinch to zoom, rotate the device for an even bigger display • Works on iPhone and iPad • All documents are stored in the app, no need for an internet connection! And there's even more, need to get in touch with a manufacturer about a fault? The app includes contact details for all 17 manufacturers, that includes phone numbers and email addresses... • View contact details for each manufacturer by tapping on the i button below the logo • Includes main and technical (where available) phone numbers • Technical or main email address • Link to their main website • Full address • Add to your own contacts Got an idea for how we can make this app better? Send us an email anytime: support@mrcombi.com

Screenshots

Heat Engineer4 screens
Boiler Fault Codes4 screens

Verdict

The call

The clearest difference is review sentiment: Heat Engineer at 79% against Boiler Fault Codes's 14%. Heat Engineer also leads on price (Free vs $4.99). Boiler Fault Codes's advantage is in-app purchases (none vs 1) and iOS requirement (13.0 vs 16.4). On update cadence, ads and device support 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

Heat Engineer is free to download; Boiler Fault Codes costs $4.99 up front. Heat Engineer sells 1 one-off in-app purchase. Boiler Fault Codes asks for nothing beyond the download.

UpkeepUpdate frequency

Heat Engineer ships an update every 2 months, Boiler Fault Codes every 3 months. The most recent releases landed on October 18, 2026 and October 15, 2026 respectively.

Scorecard5 real differences · 3 level
Heat Engineer versus Boiler Fault Codes: the parameters behind the verdict, then further details
ParameterHeat EngineerBoiler Fault Codes
PriceFree — better$4.99
Positive reviews78.9% of reviews — better14.3% of reviews
Update frequencyEvery 2 months — betterEvery 3 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree — betterPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.413.0 — better
Further details — not scored
Size306 MB23 MB
Age rating4+4+
DeveloperHeat Engineer Software LtdMr Combi Training

Customer experience

Heat Engineer

Written reviews19 reviews
Positive78.9%
Neutral0.0%
Negative21.1%

Boiler Fault Codes

Written reviews7 reviews
Positive14.3%
Neutral14.3%
Negative71.4%

In-app purchases

1 purchases

Heat Engineer

One-time1
  • MCS 020 PDF Report Token$2.99
None

Boiler Fault Codes

No in-app purchases

Questions

Is Heat Engineer free?
Heat Engineer is free to download, with in-app purchases available.
Is Boiler Fault Codes free?
Boiler Fault Codes costs $4.99, with no in-app purchases.
Do Heat Engineer or Boiler Fault Codes have ads?
Neither Heat Engineer nor Boiler Fault Codes shows ads.
Which is updated more often, Heat Engineer or Boiler Fault Codes?
Heat Engineer ships an update every 2 months, and Boiler Fault Codes every 3 months. Most recently, Heat Engineer was updated on October 18, 2026 and Boiler Fault Codes on October 15, 2026.

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