Comparison

Heat Engineer vs Caleffi Pipe Sizer

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

Caleffi Pipe Sizer

This application assists hydraulic and HVAC professionals in accurately sizing water or air pipes. It calculates pressure drops and offers a modern, intuitive interface for precise system design on the go.

Highlights
  • Accurate water/air pipe sizing
  • Pressure drop calculation
  • Customizable technical parameter calculations
  • Extensive material and configuration library
  • Modern and intuitive interface
  • Enhanced performance
Features
Read full description

Caleffi Pipe Sizer is the essential app for engineers, designers and installers operating within the hydraulic systems and heating and cooling sector. This app can be used to size water or air pipes accurately and calculate both localised and widely distributed pressure drops easily, wherever you are. The app, featuring a fully redesigned frontend, offers a new-look interface and improved performance. Download the app and start designing with speed and precision! Main Features of the Update: - Native Look & Feel: new, more modern and intuitive interface - Alignment with Standards: compatible with the latest mobile app standards - Enhanced Performance: optimised performance to guarantee a fluid and reactive user experience Functions: - Accurate sizing of water or air pipes - Customisable calculations based on technical parameters - Extensive library of materials and configurations Why Choose Us? - Precision: advanced calculation tools ensure accurate results - Innovation: the new version is enhanced with cutting-edge technologies which offer improved performance and greater ease of use - Complete support: compatible with the latest iOS devices

Screenshots

Heat Engineer4 screens
Caleffi Pipe Sizer4 screens

Verdict

The call

The clearest difference is in-app purchases: Caleffi Pipe Sizer at none against Heat Engineer's 1. Caleffi Pipe Sizer also leads on iOS requirement (13.0 vs 16.4). Heat Engineer's advantage is review sentiment (79% vs 50%) and update cadence (every 2 months vs every 7 months). On price, ads, monetization model 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

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

UpkeepUpdate frequency

Heat Engineer ships an update every 2 months, Caleffi Pipe Sizer every 7 months. Both last shipped on October 2, 2026.

Scorecard4 real differences · 6 level
Heat Engineer versus Caleffi Pipe Sizer: the parameters behind the verdict, then further details
ParameterHeat EngineerCaleffi Pipe Sizer
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews78.9% of reviews — better50.0% of reviews
Number of ratings—1 — better
Update frequencyEvery 2 months — betterEvery 7 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.413.0 — better
Further details — not scored
Size203 MB44 MB
Age rating4+4+
DeveloperHeat Engineer Software LtdCaleffi S.p.A

Customer experience

Heat Engineer

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

Caleffi Pipe Sizer

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

1 purchases

Heat Engineer

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

Caleffi Pipe Sizer

No in-app purchases

Questions

Is Heat Engineer free?
Heat Engineer is free to download, with in-app purchases available.
Is Caleffi Pipe Sizer free?
Caleffi Pipe Sizer is free to download, with no in-app purchases.
Do Heat Engineer or Caleffi Pipe Sizer have ads?
Neither Heat Engineer nor Caleffi Pipe Sizer shows ads.
Which is updated more often, Heat Engineer or Caleffi Pipe Sizer?
Heat Engineer ships an update every 2 months, and Caleffi Pipe Sizer every 7 months. Most recently, Heat Engineer was updated on October 2, 2026 and Caleffi Pipe Sizer on October 2, 2026.

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