Underfloor Heating Design
From floor plan to a contractor-ready PDF with your logo in one tool. Drawing is free; the finished document comes with the project unlock.
The underfloor heating module in HeatAlgo is browser-based underfloor heating design on the building's floor plan - zones, loops, and thermal calculations for heating installers. Drop in a PDF or image from your architect, calibrate the scale in two clicks, and draw the pipe layout with automatic calculations.
Context
Why designing underfloor heating is hard
Pipe layout design requires paid CAD-like software. You need training, a licence, and a specific Windows machine. For a single project, that's often too much overhead.
Without such a tool, installers sketch on paper and estimate pipe length from experience. A wrong estimate means buying too much or too little pipe, incorrect spacing, cold spots on the floor, and a complaint from the client.
HeatAlgo takes a different approach: upload a PDF floor plan from the architect or client, draw zones directly on it, and design the pipe layout with real-time thermal calculations.
Step by step
How to design underfloor heating
Upload the floor plan
PDF, JPG or PNG from the architect or client. Drop the file in and you immediately see the plan in the tool.
Features
Everything you need to design underfloor heating
Comparison
HeatAlgo vs traditional software
Tool comparison for underfloor heating design
HeatAlgo
Traditional software
Free forever, reports from €25
Price
A per-seat licence
Price
Browser
Installation
Computer (Windows)
Installation
PDF, JPG, PNG
Floor plan import
None or limited
Floor plan import
Yes (draw on imported plan)
Design on floor plan
Manual drawing
Design on floor plan
Yes (area, length, power)
Thermal calculations
Often not included
Thermal calculations
Unlimited
Undo/redo
Limited
Undo/redo
FAQ
Frequently asked questions
Which floor plan formats can I upload?
PDF, JPG, PNG. Anything you get from the architect or client.
Can I choose serpentine or spiral?
Yes. Draw the pipe layout directly on the plan, serpentine or spiral. Calculations update as you go.
Does the result include pipe length and spacing?
Yes. For every zone the app works out area, pipe length, pipe spacing and heating output - automatically, on every change. On a free account you see those figures for one room; the rest are unlocked with a report.
What does HeatAlgo cost?
Your account is free forever - draw and calculate without limit, no card required. On a free account one room comes back fully calculated; the spacing, the remaining loop lengths, the flow rates and the printable floor plan are unlocked with a report: €25 per project, or unlimited on the Installer subscription from €83.25/mo billed annually.
Can I design multiple floors?
Yes. For each floor you upload a separate plan and draw the zones independently, inside one project. Floors imported from the heat load calculation are created for you; on a free account, adding one by hand needs the project unlocked.
What is the maximum loop length?
The limit depends on pipe diameter and counts the run to the manifold: for 16x2 pipe HeatAlgo warns from 80 m and hard-stops at 90 m, for 17x2 from 90 m and 100 m. You can split a zone into smaller loops - just remember each one carries its own run, so a split divides the pipe in the room, not the distance to the manifold.
Can I change the pipe spacing?
Yes. For each zone you can set a different spacing. The system recalculates the layout automatically after every change.
Does the result include material requirements?
Yes. The app works out the exact pipe length and square metres for every zone - ready to order against. The combined schedule and the individual loop lengths are unlocked with a report.
Worked answers
How many loops a typical room needs
Computed for six room sizes - the loop drawing, the pipe length and the floor output.
Ecosystem
Other tools
Design your first underfloor heating layout today
Register, upload a floor plan, and see loops with calculations plus a contractor-ready PDF with your logo.
No payment card. Your projects and calculations stay forever.