Radiant Floor Heating Calculator

Estimate room heat load, active heated floor area, electric circuit demand, hydronic loop planning, and output density from one room-by-room radiant sizing tool.

Load-based sizingRoom type, temperature difference, ceiling height, insulation, and exposure build the room demand before the floor system is checked.

Assembly-aware outputSystem profile, floor finish, spacing, and thermal mass depth shift practical output density so slab, tile, wood, and carpet are not treated equally.

Electric or hydronicElectric plans show watt load and control zones while hydronic plans show tubing length, loop count, and design flow for the selected assembly.

📌Preset Projects

Imperial inputs active

Presets fill geometry, room assumptions, finish, and a radiant profile. Adjust any field and recalculate to refine the floor plan.

Electric densityTypical finished output lands around 10 to 15 W per sq ft.

Hydronic densityLow-temp floors often deliver 20 to 32 BTU/h per sq ft.

Loop planningTube length is based on active area and spacing, then split by practical loop limits.

Coverage noteFixed cabinets, tubs, and islands reduce active radiant area.

This tool is for preliminary sizing. Match its output with your final room-by-room heat loss method before locking in the finished design.

📏Floor Geometry

Floor shape

Room type

Floor length (ft)

Floor width (ft)

Fixed obstruction share (%)

Subtract vanities, tubs, cabinets, islands, and built-ins from active coverage.

Ceiling height (ft)

🌡Load and Assembly Inputs

Indoor setpoint (°F)

Winter design outdoor (°F)

Insulation level

Exterior exposure

Finished floor covering

Sizing buffer

Thermal mass depth

Tile over a medium-mass assembly preserves high output density and responds faster than carpeted or heavy slab builds.

🔧Radiant System Inputs

Radiant floor system

Electric supply voltage

Continuous load is checked against a 15A thermostat at 80% usable load.

System note will update after you select an electric mat or hydronic panel profile.

📊Radiant Floor Results

Design Load

0 BTU/h

0 W required

System Capacity

0 BTU/h

Output density will appear here

Active Floor Area

0 ft2

Coverage ratio will appear here

Circuit or Loop Plan

Electrical or hydronic planning output

Choose a preset or enter floor data to calculate a radiant floor sizing recommendation.

🧱Radiant System Profiles

📑Reference Tables

System Type	Typical Output	Voltage or SWT	Best Fit

Floor Finish	R-Value	Delivery Factor	Radiant Note

Project	Gross Area	System	Main Result	Secondary Result

💡Radiant Planning Notes

Surface finish sets the comfort ceiling

Low-resistance finishes such as tile or polished concrete help a radiant floor deliver design output with lower water temperatures or lower cable density than carpeted rooms.

Coverage ratio changes required density

If only part of a room can accept tubing or mats, the radiant layer has to deliver the same room load through less active area, which often pushes larger zones toward hydronic assemblies.

Radiant heatings deliver heat directly to the floor or to panels in walls and ceilings. They operate chiefly by means of radiant heat transfer that bears heat of warm surfaces to folks and stuff. Traditional heating systems require fans and heat the air in the room but floor heating use radiant technique for heat you and objects directly of below.

Like this it is more efficient because the heat attains yourself and the humidity stays natural It likes sun warm: from shade in sun and you feel the difference.

How Radiant Floor Heating Works

Trispecaj radiantoj exist for floor warming. Ephemeral radiant floors use air as heat carrier electrical have wires and hidroniaj aquatic tuboajn nets. Electrical knit wires in zones as bathroom and control by means of thermostat.

Those elements consume around 15 watts each square foot. In 35-square pieda bathroom during 8 hours daily that only requires 4,2 kWh day. Under ceramic floor you can install them in low cost with some watts each foot.

Hidroniaj nets have little drains knitted through the whole floor. You installs them under wooden subplanko or in betona verŝuto up. In kelroj and garages they go in concrete plates.

They coincide with gaseous fornilo or geotermaj pumps for low temperatures. Miksvalvo operate the akvotemperaturon to the tubes. Forna water must be 160, 180 grades but the nets work at around 100 grades.

Aluminium well leads heat. Aluminum varmtransigaj plates allow efficient implementation of radiant systems when concrete up it is possible not. You uses floor heating also outside for inhibit ice on ways pavements and roofs.

Malpluso are that old floors must remove for new gate below. Radiantoj react slowly to aerŝanĝoj so the warming climbs a bit of time.