Where does your heat pump data come from?

The sizing picks one of 10 generalised heat pump power classes, from 4 to 16 kW. Their characteristics - COP curves, costs - are averaged from catalogue data on 239 devices from 28 manufacturers. This isn't a database of specific models to pick from, just a reference point for preliminary sizing.

Does the radiator analysis account for flow temperature?

Yes. For each flow temperature scenario (e.g. 40 °C, 55 °C, 60 °C) we check whether the radiator output covers the room's heat demand. You see exactly which radiator needs replacing.

Can I compare several heat pumps for the same building?

You compare flow temperature scenarios and power classes, not specific models. The system shows how the required power and running cost change with flow temperature - choosing a specific device from a manufacturer stays your call.

What does HeatAlgo cost?

Your account is free forever, no card required. The preview shows the building summary, one fully calculated room and the recommended pump. You unlock the full results and the PDF report with a purchase: €29 per project, or unlimited on the Installer subscription from €28/mo billed annually. A report for this module alone from €19.

Can I save a project and come back later?

Yes, data is saved automatically to the cloud. You can return to your project from any device: desktop, tablet, or phone.

How many rooms can I add?

There is no room limit - the system processes each room individually and shows results for the whole building.

Does it work for multi-family buildings?

The tool is built for single-family homes - the pump power classes go up to 16 kW. For a larger building you can still calculate room-by-room demand, but treat the power sizing as indicative only.

Can I change the radiator type in the analysis?

Yes. For each room you can select a different radiator type and size and immediately see how the analysis result changes.

Heat pump sizingfrom the heat loss.

A power class from the heat loss, radiators checked at lower flow temperatures, three variants. Preliminary sizing - not a replacement for an installation design.

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A power class from the building's loadsized from the heat loss · three supply variants

What it is

Heat pump selection in HeatAlgo is a browser-based preliminary pump power sizing with room-by-room radiator analysis - for installers and homeowners. Enter the building and radiator data, compare 3 flow temperature scenarios and get the result as a PDF.

An oversized pump cycles.An undersized one falls short.

The power of a heat pump follows from the building's load, not from the floor area or a catalogue. Then comes the question of which radiators cope with a lower supply temperature - and what each variant costs.

Power from a rule of thumbkilowatts per square metre or from memory, without this building's load

The radiators are unknownnobody checked which of them work at a lower supply temperature

Variants nobody compares35, 45 or 55 °C of supply changes both the pump and the radiators - and they are rarely set side by side

How to sizethe pump.

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Algo AI in HeatAlgo - a new conversation beside the heat loss result: check the project, upload a document

Building step in the heat pump sizing module - location, floor area, residents, electricity price and hot water

Rooms in the heat pump module - the heat emitters in each room: underfloor heating, radiators or both

Preliminary heat pump sizing - flow temperature scenarios compared with SCOP and costs

Room-by-room radiator analysis - feasibility status at the selected flow temperature

Heat pump sizing PDF report - cover page and the result page with the recommended variant

Which radiatorsstay?Ask Algo AI.

Algo AI reads the sizing result and the room-by-room radiator check. Ask about a power class, a supply temperature or one room - it answers from your numbers. The sizing is preliminary and does not replace an installation design.

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Which radiators can stay at a 45 °C supply?

THINKING

In the check at 45 °C the living room, bedroom and kitchen are covered and the bathroom is about 30 % short. Keep those three; replace the bathroom radiator with a larger one, or compare the 50 °C variant - the table shows what it changes in SCOP and consumption.

Ask about a power class, a room or a variant…

Everything for the conversationabout a heat pump.

Heat pump sizing result in the HeatAlgo app - the chosen pump's output and how it was reached, step by step

Radiator analysis, room by room.

A clear answer for every room: the radiator stays or gets replaced. You see straight away where a low flow temperature is enough.

Three flow temperature scenarios side by side.

10 power classes averaged from market data.

A PDF report with a modernisation plan.

Heating costs compared per year.

Runs in the browser, no installation.

HeatAlgo vssums on paper.

Traditional software

PriceA per-seat licence
InstallationDesktop (Windows)
TrainingWeeks
Radiator analysisLimited or none
PDF reportYes, complex
Power sizingVaries

HeatAlgofree

PriceFree forever, reports from €19
InstallationBrowser
TrainingNone
Radiator analysisRoom by room
PDF reportYes, simple and clear
Power sizing10 power classes, data from 239 devices

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a free account · full results and PDF after purchaseSee the method: a reference house calculated in full →

Frequently asked questions

No. HeatAlgo gives you a preliminary pump sizing for client conversations. A full installation project requires a site visit, accurate measurements, and consideration of local conditions. You use HeatAlgo at the sales stage, and do the full project after the client decides.

Other tools

Heat Loss Calculationheat loss to EN 12831-1Underfloor Heatingzones on the plan, loops from geometry AI client formclient data without the phone calls

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