Fixed load

Underfloor Heating Mat

A fixed resistance laid in a mesh — the whole floor becomes the heater, slowly.

Real part — tap a marker

Underfloor Heating Mat

A fixed resistance laid in a mesh — the whole floor becomes the heater, slowly.

Terminals

Cold tail — the mains lead that runs to the thermostat
Factory joint between the cold tail and the heating cable
Floor probe (sensor) leads — low voltage, to the thermostat
Earth braid or screen, bonded at the thermostat

Heating cable — a series resistance in a fluoropolymer jacket
Fibreglass mesh backing — sets the spacing
Factory joint — the only joint allowed in the screed
Cold tail — the unheated lead back to the connection box
Floor temperature probe in its own conduit

⚡ Meet it in a circuit

16Underfloor Heating ZoneAdvanced

Terms used here

Defined in the glossary — each one opens at its own entry.

ContinuityTesting

⚠ Safety note

The mat is a fixed load buried in screed, so the insulation-resistance and continuity tests are done three times: before it is laid, after the screed goes down, and before it is tiled. Never cut the heating cable to shorten it — that changes the resistance and the wattage, and any joint buried in the floor will fail.

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