Elektra UltraTec loose electric underfloor heating cable kit

ELECTRIC CABLE SIZING GUIDE

Choose Your Undertile Heating Cable

Find a cable size for your usable heated area and planned floor construction.

Check the sizing table, then confirm the route and spacing before ordering. The heating cable is supplied as a fixed length and must never be shortened.

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Cable size reference

Undertile Cable Sizing Table

Measure only the floor area you intend to heat, excluding fixed units and fittings. Use the relevant column as a starting point, then confirm the cable spacing and output for your complete floor construction.

Part number & power Cable length Wood-base area Concrete-base area
DM10/90 · 90W 9m 0.7–1.0m² 0.45–0.65m²
DM10/135 · 135W 13.5m 1.0–1.2m² 0.65–0.9m²
DM10/145 · 145W 15m 1.2–1.7m² 0.9–1.1m²
DM10/220 · 220W 22.5m 1.7–2.2m² 1.1–1.5m²
DM10/285 · 285W 28.5m 2.2–2.8m² 1.5–1.9m²
DM10/320 · 320W 32m 2.8–3.3m² 1.9–2.1m²
DM10/400 · 400W 40m 3.3–4.0m² 2.1–2.5m²
DM10/450 · 450W 45m 4.0–4.5m² 2.5–2.8m²
DM10/555 · 555W 55m 4.5–5.5m² 2.8–3.6m²
DM10/690 · 690W 70m 5.5–6.9m² 3.6–4.5m²
DM10/780 · 780W 78m 6.9–7.8m² 4.5–5.2m²
DM10/980 · 980W 98m 7.8–9.8m² 5.2–6.5m²
DM10/1100 · 1100W 110m 9.8–11.0m² 6.5–7.3m²
DM10/1320 · 1320W 132m 11.0–13.2m² 7.3–8.8m²
DM10/1650 · 1650W 165m 13.2–16.5m² 8.8–11.0m²
DM10/2050 · 2050W 203m 16.5–20.5m² 11.0–13.6m²

DM10/90 · 90W

Cable length
9m
Wood-base area
0.7–1.0m²
Concrete-base area
0.45–0.65m²

These coverage ranges are a selection guide. Floor construction alone does not determine the required output. Confirm the cable specification, route and spacing before ordering. For HeatBase, use the kit’s specified channel spacing and coverage instead. View cable options.

CHOOSE BY ROOM SHAPE

Still Choosing Between Mats and Cable?

If you have not settled on loose cable, compare the alternatives for your room layout.

MAT

Regular, open floor area

A pre-spaced MD heating mat is usually quicker to position across uncomplicated tiled rooms.

Explore MD Mats

LOOSE CABLE

Irregular or awkward room

UltraTec loose cable can follow alcoves, curves and fixed obstacles at a planned spacing.

Explore UltraTec

HEATBASE

Cable with uncoupling membrane

The HeatBase kit combines loose cable with a decoupling membrane for a guided cable layout.

Explore HeatBase

ESSENTIAL RULES

Check the Layout Before Installation

The current Elektra instructions take priority over this selection summary.

Never cut the heating cable

Select a fixed cable length that fits the planned heated area at the approved spacing.

Keep runs separated

Cable runs must not cross or touch and must maintain the specified minimum spacing.

Test during installation

Record resistance and insulation-resistance readings at the stages required by the current manual.

Use a qualified electrician

The final electrical connection and circuit protection must be completed and verified correctly.

COMMON QUESTIONS

Cable Selection Questions

Common checks when moving from room area to cable size.

Should I use the full room area?

No. Use the free floor area that can safely be heated after excluding fixed furniture and permanent fittings.

Can I shorten a cable that is too long?

No. The heating cable cannot be cut or shortened. Select a smaller cable or revise the approved layout.

When is a mat easier than loose cable?

A pre-spaced mat is generally simpler in regular, open rooms. Loose cable is more flexible around awkward edges and obstacles.