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HeatAlgo

Your home.Calculated.In the age of AI.

Enter your house once. Room-by-room heat loss, underfloor heating and heat pump size follow from it - in one PDF report for your installer.

Create a free accountSee what the report includes
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  • No installation

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HeatAlgo - the building heat loss result

Calculated in HeatAlgo

  • over 500homeowners and installers have trusted us
  • over 10,000 m²of room floor area calculated to EN 12831-1
  • over 1,500underfloor heating sections drawn on floor plans
For 33 years I calculated all of this more slowly. Now the client's data comes in by itself, and I have the heat loss calculation and the underfloor heating done in one afternoon.
Jarosławinstaller with 33 years of experience, co-creator of HeatAlgo

Know the heating demandbehind the quote.

Prepare the report yourself in HeatAlgo, using your house dimensions and building details.

  • Whole-house and room-by-room heat loss
  • Transmission, ventilation and thermal bridges
  • Building elements and the inputs used in the calculation
  • A PDF report to discuss with your installer

HeatAlgo is a self-service calculation tool, not a site survey. A HeatAlgo report is not an MCS heat loss calculation.

See the method: a reference house calculated in full →

Sample files

An example house, real files from the app - the same as yours.

From your building datato a PDF report.

Prepare the project first. Buy the report when you are ready to unlock it.

Create your house project

Add the rooms, dimensions and building details. You can upload drawings and let Algo AI suggest the inputs.

Check the inputs

Review and approve the dimensions, building elements and ventilation data. HeatAlgo calculates room by room from the values you confirm.

Unlock your report

Buy the report when you need the document. One payment unlocks all modules for this house.

One assistant.Four modules.

The same building data feeds all four modules. You enter it once - Algo AI makes sure nothing is missing and answers questions about your project.

Heat loss
Underfloor heating
Heat pump
Heat recoverybeta
AlgoYour homeFeedback

Which heat pump for a 160 m² house?

THINKING

Let's calculate the heat loss first. Enter the room dimensions or upload the drawings - I will read the data from them. The room-by-room result shows the power you really need, and we check it against the offer.

HeatAlgo - a floor plan with the underfloor heating sections and their pipe layouts

New · Algo AI

Upload a plan.AI drawsthe sections.

PDF, PNG, JPG, HEIC, DWG or DXF. Algo AI reads the rooms, doors, windows and scale from the plan, and the engine draws the sections with their pipe layouts, the manifold and the runs to it, matched to the rooms from the heat loss calculation. It works out the output, flows and pressure drop to EN 1264. You check them on the drawing, untick what you do not want, apply. Everything stays editable, and the first read of a plan on an account is free.

See the module: Underfloor heating →
How AI section drawing works →

Room by room.No shortcuts.

Transmission, ventilation and thermal bridges - calculated separately for every room, as the standard requires. A result you can put next to the installer's offer.

See the module: Heat loss calculation →
See the method: a reference house calculated in full →Guide: what a heat loss calculation is and what depends on it →
HeatAlgo - room-by-room heat loss

Ten power classes.One that fits.

Every class checked against your house's load. You see what fits, what is too small - and what someone wants to oversell you.

4 kW
5 kW
6 kW
7 kW
8 kW
fits the load9 kW
10 kW
12 kW
14 kW
16 kW
See the module: Heat pump selection →
HeatAlgo - the heat pump sizing result

Got the drawings?Don't retype them.

Upload the building design or a floor plan. Algo AI reads the dimensions and the building elements and proposes the values - you check and approve them. The algorithm always does the calculation.

house-160-plans.pdf · ground floor · p. 3/14
Window W1 · 1.5 × 1.5 mU = 0.90 W/m²K, from the window schedule
External wall · 38 cmsand-lime + 15 cm EPS, from the element description
Living room · 27.3 m²from the plan, after scale calibration
Section A-A · height 2.7 mfrom the section, for every room
Algo AI reads the documents · You approve

You are noton your own.

Two ways forward when you get stuck - a question to Algo AI or a step-by-step guide.

AlgoYour homeFeedback

I'm stuck on the windows - what do I enter for U?

THINKING

For new windows enter U = 0.90 W/m²K - the value from the window schedule in your drawings. I will show you which page it is on.

Ask Algo anything...
Help centre

Practical knowledgeabout heating a home.

See all posts →
Guides

Underfloor heating not working in one room? Check heat loss and loop flow first - 5 causes in order

Underfloor heating not working in one room? Check in order: the room's heat loss against the floor's output, loop flow, flow temperature and floor covering.

Releases

Update: underfloor heating drawn for you, the app in five languages and new PDF reports

Algo AI reads the floor plan and the app draws the underfloor heating. The app now speaks German, French and Dutch, and PDF reports have a new print design.

Releases

Update: a bill of materials, one-module reports and Algo AI in every field

Underfloor heating now works out what to order from the merchant, a report can cover one or two modules, and one Algo AI reading fills three modules.

Releases

Update: Algo AI reads the building design, party walls and My library

Algo AI fills the heat loss calculation from the building design, party walls count against the neighbour, and underfloor heating gets a new panel.

Guides

Retrofit underfloor heating on a concrete floor: milling channels or an overlay?

Floor milling cuts channels for water underfloor heating into your existing screed. When the floor suits it, what a quote should list, and the alternatives.

Guides

Retrofitting water-based underfloor heating: what to measure first

A new screed, a dry system or milling? Measure levels at doors, thresholds and stairs, find out the floor layers and check room heat loss. With a worksheet.

Guides

Where to put an underfloor heating manifold: cupboard, under the stairs or central?

Choosing an underfloor heating manifold location: one floor, two positions, the pipe runs and loop lengths HeatAlgo calculated, and what to ask your installer.

Guides

How to check an underfloor heating design: the drawing, the loop schedule and room heat loss

Check the drawings, room calculations, loop details and handover scope in a water-based underfloor heating design. Includes a quote-comparison worksheet.

Guides

Getting an underfloor heating quote: what to prepare and how to compare quotes

Prepare for a water-based underfloor heating quote: floor plans, insulation, floor finishes, heating system and questions for your installer.

News

Underfloor heating from a floor plan: AI draws the sections and loops

Upload a floor plan (PDF, PNG, JPG, HEIC, DWG or DXF): HeatAlgo draws underfloor heating sections, supply runs and the manifold, output and flows to EN 1264.

Releases

Update: simpler plan selection and checkout

Compare plans in one window, unlock a complete project and enter your discount code at checkout.

Guides

Heat recovery ventilation in HeatAlgo (beta): six steps from rooms to the balance and the unit

The six steps of the ventilation module: building, rooms and airflows to PN-83/B-03430, ducts on floor plans, the unit from EPREL, modes and the balance.

Guides

Algo, the AI assistant in HeatAlgo: what it does, where to find it and its limits

Where to open Algo AI, how it reads building documents and reviews a project, the Propose and Automatic modes, undo, files, sources and the monthly limit.

Releases

Update: underfloor heating now computes to EN 1264

Loop output answers to spacing, layout and the drawn pipe; the characteristic from EN 1264-2, each loop's spread and flow from EN 1264-3 - what's new in HeatAlgo.

Guides

Underfloor heating flow temperature with a heat pump: what each floor finish gives at 35-45 °C

Water temperature and floor covering set a floor's output, not its area. Calculated table: what 30, 35, 40 and 45 °C give per m² under tile, wood and carpet.

Guides

Electric underfloor heating loses its subsidy in 2027 - what stays in Czyste Powietrze

From 2027 the programme funds no heating mats, electric boilers, electric radiators or electric underfloor heating. What stays on the list, and what it changes.

Guides

Underfloor heating pipe spacing: 100, 150 or 200 mm, and how long a loop can be

The (area ÷ spacing) × 1.1 formula counts neither the run to the manifold nor the setback from the walls. Here is how far off it is, and how to work out a loop from real geometry.

Guides

Split heat pump ban 2027: what leaves the market, and what stays

No, an installed heat pump does not have to be replaced. From 1 January 2027 split air-to-water units up to 12 kW on GWP 150 or more leave the market.

Releases

Update: data travels between modules, and the app has a new layout

Heat loss calculations and the client form now feed every module, the app has a new layout, and supply runs can cross heated rooms - what's new in HeatAlgo.

Guides

Oversized heat pump: short cycling, and how to check your installer's kW figure

Why a heat pump sized "with a margin" cycles, loses seasonal efficiency and wears its compressor faster - and how to size one from a calculation, not a rule of thumb.

Guides

Installer's glossary: heat loss, U-value, lambda, thermal bridges

Heat loss and equipment sizing terms explained: U-value, lambda, thermal resistance, thermal bridges, n50, bivalent point, SCOP and the heating curve.

Guides

A client's glossary: what the terms in your installer's form mean

Your installer is asking for floor plans, sections and a window schedule? Here is what each of those documents is, why it is needed and where to find it.

Guides

Heat loss calculation, room by room: what it is and why W/m² rules of thumb fail

The design heat loss is the power a house needs in the coldest hour of the year, to EN 12831-1. Worked example: 102.2 m², 4382.07 W. What depends on it, what it costs.

Releases

Update: pump sizing straight from the heat loss calculation

The pump module now reads the project's heat loss calculation directly - no imported copies, a per-room loss breakdown, and the full reasoning behind the selected capacity.

Releases

Update: a new generation of underfloor heating drawings

Spiral and meanders drawn like a working design, consistent rules for any room shape, and editable loop nodes - what's new in HeatAlgo.

Releases

Update: AI fills in project data from building documents

AI reads the building design, window schedule and energy certificate, and you approve the data into the heat loss form - what's new in HeatAlgo.

Guides

How to use the underfloor heating module - a step-by-step guide

Upload a floor plan, draw sections yourself or let Algo AI draw the loops, supply routes and manifold, check the results, and download the report and floor plan as PDFs.

Releases

Update: better underfloor heating design and in-app help

A smoother underfloor heating design workflow, in-app help, a help center and multiple storeys in one project - what's new in HeatAlgo.

Guides

How to send a client the form and get complete data - a guide

From creating the project to accepting the client's data - a simple step-by-step guide, screen by screen, no jargon.

What is free,and what the report adds.

Calculating is free, with a preview of the results. You unlock the full results and the PDF report with a purchase.

Free

  • Your house data and the calculations
  • A preview of the results in every module
  • Any number of projects

With the report: €29

  • Full results in every module
  • The PDF report, the floor plan and the materials list
  • New PDF versions for 7 days from the first download
Create a free accountSee what is free →

€29 incl. VAT · one project · one payment

Before you prepare the report

No. You prepare the project yourself using your building data. HeatAlgo calculates from the inputs you enter and approve. The report does not include a site survey or an engineer checking the building in person.

Put room-by-room results behind your heating decision.

Prepare a report for your house.

Create a free accountSee what the report includes

Create an account, add your building data, then buy the report in the app.