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 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.

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 15.6). 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 August 5, 2026 and September 20, 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, iPad, iPodiPhone, iPad, iPod
Requires iOS15.613.0 — better
Further details — not scored
Size44 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 August 5, 2026 and Boiler Fault Codes on September 20, 2026.

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