Skip to main content

Underfloor Heating Loop Calculator

Lifestyle Tools

Pipe length and loops, JGJ 142-2012 spacing limits

Quick Answer

Underfloor Heating Loop Calculator: Pipe length and loops, JGJ 142-2012 spacing limits. Underfloor Heating Loop Calculator uses standard everyday life formulas to compute accurate results instantly.

㎡

Pipe spacing

mm
m
Pipe length (planned)600 m

Loops 8 · Per loop 75 m

Straight-run theory 500 m

How it works

  1. 1Theory = 100 ÷ 200/1000 = 500 m; plan (x1.2) = 600 m
  2. 2Loops = ceil(600 / 80) = 8
  3. 3Per loop = 600 / 8 = 75 m (limit 80 m)

Reading the result

Per-loop lengths should stay within 15 m of each other for hydraulic balance; a single manifold handles at most 8 loops. Wet rooms and exterior-wall zones use tighter spacing (150 mm), corridors can go 250 mm.

Per JGJ 142-2012 (Radiant heating & cooling technical specification): pipe spacing 100-300 mm; De20 loop length ideally ≤100 m, hard cap 120 m (De25: 150 m). The 1.2 multiplier covers bends, wall clearance and manifold tails; 16 mm pipe at 200 mm spacing runs about 6-7 m per m² in practice. Pipes must be laid in one continuous run with no buried joints, and pressure-tested before pouring the screed.

Was this tool helpful?

How to Use

  1. Enter scenario values: fill real-life numbers into the Underfloor Heating Loop Calculator (defaults work for a quick try).
  2. Instant results: everything computes live, no button needed.
  3. Read the advice: results come with practical tips, reference standards and pitfalls.
  4. Compare options: adjust parameters to compare choices side by side.

Key Points

  • Underfloor Heating Loop Calculator is a free online everyday life tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Pipe length and loops, JGJ 142-2012 spacing limits.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Underfloor Heating Loop Calculator formula

Underfloor Heating Loop Calculator uses standard everyday life formulas to compute accurate results instantly.

FAQ

How do I use the Underfloor Heating Loop Calculator?
Open the page and fill in the input fields — results update automatically. Pipe length and loops, JGJ 142-2012 spacing limits.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

Related Tools

Related Guides

Source & Updates

Based on common formulas and industry conventions. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Underfloor Heating Loop Calculator[EB/OL]. https://www.yijiansuan.com/en/c/life/floor-heating

Results provided by this tool are for reference only and do not constitute professional advice.