Small room, high demand — the profile that delivers 50% more heat per metre

The BM3 Mini Kit is for compact spaces that need more warmth than wall length would normally allow. The taller 170mm profile delivers 50% more output per metre than the standard BM2 — making it the natural choice when you're on a heat pump, have limited wall length, or need to heat a poorly insulated room.

Boiler Output

810W

2,670 BTU — from 4.5 metres of skirting

Heat Pump Output

405W

1,360 BTU — at low flow temperatures (35–45°C)

Why choose BM3

When standard output isn't enough.

50% more output per metre

BM3 stands 170mm tall versus 115mm for BM2. At 45°C flow, that's 83W/m versus 58W/m — a critical difference in compact rooms where every metre of skirting has to work harder.

Heat pump optimised

At low flow temperatures, every watt per metre counts. BM3 delivers 46W/m at 35°C versus 31W/m for BM2 — ensuring the room actually reaches comfort temperature on a heat pump.

Eliminate the radiator, keep the space

The same wall-space benefits as all ThermaSkirt — remove the radiator, reclaim the wall — but with significantly more heat delivered from less skirting length.

Silent, always

The same completely silent operation as every ThermaSkirt profile. No expansion sounds, no ticking, no noise of any kind.

What's in the box

Everything you need — nothing you don't

Identical kit structure to BM2 — the same proven system, with a taller skirting profile for higher output.

11 × 4.5m BM3 skirting — with wall brackets, reflective backing foil and top gasket
21 × Universal Feed & Return Kit — TRV valve, lockshield valve and all connection fittings
31 × Internal 90° corner kit
41 × Installation & Spares Kit

Features & benefits

Built to last. Designed to disappear.

Provided as a kit of parts — cuts to length with a standard chop saw and suitable blade

Tough, double epoxy powder-coated aluminium finish resists scratching and marking

Works with any boiler or heat pump — no system changes required

Paintable to match any interior — white as standard (RAL 9010)

75% recycled aluminium, UK manufactured, fully recyclable at end of life

10-year manufacturer warranty — expected lifespan of 40+ years

Not sure whether you need BM2 or BM3?

Tell us your room dimensions and heat source — we'll recommend the right profile.

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BM3 · High Output

This kit uses the Deco BM3 (170mm) high-output profile — 50% more watts per metre than the BM2. The right choice for heat pump systems, poorly insulated rooms, or spaces where available wall length is limited.

BSRIA Tested to EN 442-1

Made in Britain

Excellent on Trustpilot

85,000+ Systems Installed

10-Year Warranty