How do I use the Hydronic Radiant Floor Heating PEX Tube Length & Loop Sizer?

Enter your specific project or financial parameters into the input fields above. The engine recalculates outputs dynamically in real time and updates visual charts and summary metrics.

Can I export and share these results?

Yes, you can generate shareable state links, export clean CSV spreadsheets, or print high-resolution executive reports with a single click.

Is this calculator free to use?

Yes, all calculation engines on ToolsVault are 100% free with no account registration or paywall required.

Hydronic Radiant Heating & PEX

Hydronic Radiant Floor Heating PEX Tube Length & Loop Sizer

Calculate hydronic radiant floor heating PEX tubing length (LF), loop manifold circuits, zone flow rates (GPM), pump head loss, and heat output (BTU/hr/sqft).

Radiant Heating Room Inputs

Heated Floor Surface Area (sq ft)

PEX Tubing On-Center Spacing (inches)

PEX Tubing Diameter

Room Design Heat Loss (BTU / hr / sq ft) Modern insulated home: 20-30 BTU/hr/ft²

Design Delta T (°F)

Total PEX Tubing

-- LF

Includes leader tails

Manifold Loop Circuits

-- Loops

-- ft per loop

System Flow Rate

-- GPM

-- BTU/hr

Circulator Pump & Pressure Head Requirements

Loop Head Loss (Friction Drop)

-- ft Head

Across longest critical circuit

Recommended Circulator Pump

Taco 007e / Grundfos ALPHA

Variable speed ECM pump

RPA (Radiant Professionals Alliance) Rule of Thumb:

Never exceed 300 feet per loop for 1/2" PEX tubing. Exceeding 300 feet creates excessive friction head loss, requiring oversized circulator pumps that consume excess electricity and risk uneven heat distribution across the slab.