Comparison

Heat Engineer vs Duracell Energy

Price, ratings, monetisation and update history for both apps, side by side β€” 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. 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 manufacturer’s 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

About

Duracell Energy

Monitor your home's energy consumption and the status of your connected devices, including battery storage and EV chargers. Track solar generation, battery usage, and grid energy flow with historical data visualization.

Highlights
  • Monitor home energy status
  • View battery and EV charger status
  • Track household energy consumption
  • Analyze solar generation and grid usage
  • Access historical energy data
Features
Read full description

The Duracell app enables owners of Duracell batteries and EV Charger to monitor their homes’ energy on the go. With this app you can: View the status of your Duracell connected home, battery, and EV Charger View your household consumption and the power flowing through you Duracell connected devices, giving you a clear understanding of solar generation, battery usage and grid energy usage. Access your historical energy usage data in daily, weekly, and monthly time periods, so you can understand your household consumption behaviour over time and the benefits to the environment.

Screenshots

Heat Engineer4 screens
Duracell Energy4 screens

Verdict

The call

The clearest difference is review sentiment: Heat Engineer at 79% against Duracell Energy's 6%. Duracell Energy'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 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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Heat Engineer sells 1 one-off in-app purchase. Duracell Energy asks for nothing beyond the download.

UpkeepUpdate frequency

Heat Engineer ships an update every 2 months, Duracell Energy monthly. The most recent releases landed on October 18, 2026 and October 20, 2026 respectively.

Scorecard2 real differences Β· 6 level
Heat Engineer versus Duracell Energy: the parameters behind the verdict, then further details
ParameterHeat EngineerDuracell Energy
PriceFreeFree
Positive reviews78.9% of reviews β€” better6.1% of reviews
Update frequencyEvery 2 monthsMonthly β€” better
AdsNoNo
In-app purchasesYesNo β€” better
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.415.1 β€” better
Further details β€” not scored
Size306 MB29 MB
Age rating4+4+
DeveloperHeat Engineer Software LtdPuredrive Energy Ltd

Customer experience

Heat Engineer

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

Duracell Energy

Written reviews115 reviews
Positive6.1%
Neutral11.3%
Negative82.6%

Bugs and requests

Heat Engineer

Not enough reviews yet to summarise bugs or requests.

Duracell Energy

Reported bugs

71 issues
  • Live view updates with significant delay (5-12 minutes, or up to 2 hours)
  • Other views take hours to update
  • Charge/discharge scheduling never works or is unreliable
  • App keeps logging out
  • Data lag makes energy tracking useless
Show 66 more
  • App frozen, no way to know if panels are working
  • Login captcha process does not work
  • Scheduled discharge sessions cannot be stopped
  • Bug in interface causes inverter to discharge battery despite app stopping it
  • App lost connection to inverter after upgrade
  • Data of own consumption does not tie to smart meter
  • App shows battery at 18% and charging in darkness
  • Live usage monitoring isn't live
  • Refresh button does nothing
  • System overview doesn't align with monitoring
  • Data totals missing/wrong for weeks
  • Power cut mode failed to turn off
  • App doesn't stay logged in
  • Energy insight and summaries don't add up
  • Cannot set up Dura-i app
  • App doesn't update in a timely manner
  • App shows 0W house load when electricity is being used
  • App shows large amounts of energy being used when nothing is switched on
  • App shows battery at 100%, fed by solar, house load from grid
  • App can't tell what is being generated
  • App hasn't synced to equipment data for a week
  • App shows random data/values not in sync
  • Scheduling charging/discharges is hit and miss
  • Duration setting is unclear (length vs. end time)
  • App doesn't stop charging/discharging as instructed
  • Cannot accept terms and conditions on iPhone SE (won't scroll)
  • App not optimized for iPhone SE (power cut mode, current mode options)
  • App shows incorrect flow (battery powering grid, or vice versa)
  • App shows battery feeding house when charging
  • Cannot set discharge for times other than current time
  • Cannot set discharge duration (e.g., 20, 30 minutes)
  • New update is worse
  • Discharge settings can only be set in the past
  • Update doesn't work properly
  • Latest update means app cannot be used
  • App is broken, no choice to upgrade
  • Grid export figures are incorrect (less than daily export)
  • Battery section on input does not work
  • Lost all data acquired prior to app update
  • Live part shows 0 energy use most of the time
  • Calculations are incorrect, things don't add up
  • App updates cause historic data to be wiped
  • Numbers don't add up or reconcile with overall usage
  • Difficulty creating/amending schedules
  • App shows incorrect readings
  • Customer service doesn't understand issue/makes nonsensical suggestions
  • No response to emails
  • App is clunky and unintuitive
  • App doesn't work reliably
  • App doesn't follow schedules
  • System doesn't follow schedules
  • Scheduling page to charge/discharge doesn't work
  • App shows solar generation at 1 am in winter
  • App is slow to respond
  • App will not refresh, requires logout/login
  • Scheduling is unreliable, 50/50 chance of saving
  • App throws out random data
  • App has spells where it does not provide data
  • Lack of control over battery discharge
  • Cannot pause battery discharge easily
  • UI is terrible
  • Live readings are completely off
  • App is embarrassing bad
  • Inconsistent monitoring
  • Gaps of missing information for hours
  • App is not fit for purpose

Requested features

23 requests
  • Allow discharge based on available stored power as well as time
  • Discharge to grid any stored power >20% when grid needs energy
  • Biometric authentication (Face ID)
  • App scaling for iPad
  • Error/fault reporting
Show 18 more
  • Ability to turn off unneeded features (e.g., EV status)
  • Ability to update WiFi settings
  • Export data for analysis
  • Conditional schedules (e.g., export only if battery >50%)
  • Schedules based on % or kWh rather than wattage/time
  • Totals on main summary screen
  • More telemetry from inverter/batteries
  • Total daily/monthly/annual household consumption figure
  • Total daily/monthly/annual export
  • View of future charging/discharging plans
  • Hide unused functions (e.g., car chargers)
  • Warning/alert for optimal energy usage times
  • Face ID login
  • Widgets
  • Dark mode option
  • Advanced analytics dashboard
  • Zoom function/increase font size
  • Smart home support

In-app purchases

1 purchases

Heat Engineer

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

Duracell Energy

No in-app purchases

Questions

Is Heat Engineer free?
Heat Engineer is free to download, with in-app purchases available.
Is Duracell Energy free?
Duracell Energy is free to download, with no in-app purchases.
Do Heat Engineer or Duracell Energy have ads?
Neither Heat Engineer nor Duracell Energy shows ads.
Which is updated more often, Heat Engineer or Duracell Energy?
Heat Engineer ships an update every 2 months, and Duracell Energy monthly. Most recently, Heat Engineer was updated on October 18, 2026 and Duracell Energy on October 20, 2026.

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