TROPIX 4 IN 1 STANDARD SLIMLINE BATHROOM HEATER

The Domus TROPIX 4-in-1 Standard is a slimline bathroom heater — 2,250 W, 500 m³/h extraction, twin DC motors, 595×280 mm cutout, with a switchable 1,800–2,100 lm light, in white or black.

⛔⛔ Its power field says 25 W. The appliance draws 2,250.

• ⭐ The record publishes power_watt = 25W — the LED light's wattage — on an appliance the sheet rates at 2,250 W. ⭐ An understatement of ninety times.
• ⭐⭐ WE MEASURED THE WHOLE RANGE: of 9 bathroom heaters where both figures can be read, 8 understate by more than tenfold and one is correct. ⭐ The STREAM 6-in-1 publishes 2,250 W properly, which is what makes the other eight errors rather than a house convention.
• ⚠ THE WORST IS THE THERMAFLOW AT 12 W ON A 2,150 W APPLIANCE — 179 times understated.
• ⭐⭐ 2,250 W AT 240 V IS 9.4 AMPS, WHICH IS 94% OF A STANDARD 10 A LIGHTING CIRCUIT ON ITS OWN. ⛔ This needs a dedicated circuit and nothing on the listing says so.
• ⭐ TELL YOUR ELECTRICIAN THE REAL FIGURE BEFORE THE WALLS CLOSE. ⭐ Adding a circuit at rough-in is routine; adding one afterwards means chasing walls.
• ⚠ Its sheet also says 2,250 W in the spec table and “producing a 2150W output” in the prose — ⭐ the same self-disagreement six other heaters show. Immaterial in practice: both are about 9 amps and both need their own circuit.

⭐⭐ It publishes a cutout — and no record in this catalogue does

• ⭐ The sheet gives cutout 595 × 280 mm in a 615 × 315 mm fascia — about 20 mm of cover each way.
• ⛔ THE PRODUCT RECORD PUBLISHES NO CUTOUT. ⭐ We measured that 0 of 843 records in this catalogue carry a cutout metafield, against 87 datasheets that give one.
• ⭐⭐ ON A CEILING APPLIANCE THAT IS THE FIGURE THAT DECIDES THE JOB. ⚠ A 595 mm cutout is longer than the clear gap between joists at 450 mm centres, so it will almost certainly need a joist trimmed and noggins added — carpentry before electrical.
• ⚠ AND THE CUTOUT IS THE ONE DIMENSION THAT CANNOT BE CORRECTED ONCE CUT. ⭐ Check the joist direction and spacing before ordering, not on installation day.

⭐ Twin DC motors and "Heat Breeze" — what the standard line actually does

• ⭐ Four functions: heater, exhaust fan, circulating fan and light — with twin DC motors rather than a single AC one.
• ⭐⭐ TWIN MOTORS ARE WHY IT CAN HEAT AND EXTRACT AT THE SAME TIME AT DIFFERENT RATES. ⭐ The sheet calls it Heat Breeze: heat delivered while low-level extraction runs, so warm air reaches you while moisture is still being pulled out.
• ⭐ A SINGLE-MOTOR UNIT HAS TO CHOOSE. ⚠ Extract hard and you pull the heat straight out; extract lightly and condensation builds. ⭐ Two motors let the appliance do both badly-matched jobs at once, which is the whole design argument.
• ⭐ DC MOTORS ARE ALSO QUIETER AND DRAW LESS — ⭐ 60 W for the pair here, against the 90 W an equivalent AC arrangement would typically take.
• ⭐ THE PTC ELEMENT SELF-LIMITS: its resistance rises as it heats, so it cannot run away thermally the way a bare wire element can. ⭐ In a ceiling cavity full of insulation and years of lint, that is a genuine safety property.

⭐ 500 m³/h and a 150 mm duct — size the run, not the fan

⭐ Extraction is 500 m³/h through a 150 mm duct. ⭐⭐ THAT FIGURE IS A FREE-AIR RATING AND THE DUCT RUN WILL REDUCE IT SUBSTANTIALLY. ⭐ Every bend costs flow, flexible duct costs more than rigid, and a long run costs most of all. ⚠ The commonest cause of a bathroom heater that does not clear steam is not the appliance — it is six metres of concertina'd flexible duct with three bends. ⭐ Keep the run short, keep it as straight as the roof allows, pull the flexible duct taut rather than leaving it compressed, and make sure the exterior grille is a free-flowing one rather than a fine mesh. ⭐ A 3 m flexible duct and an exterior grille are included.

⭐ The light: 1,800–2,100 lm, and it is a real light

⭐ 1,800 lm at 3000 K, 2,100 at 4000, 1,900 at 5000, CRI ≥80, changeable. ⭐⭐ THAT IS ENOUGH TO BE A BATHROOM'S MAIN LIGHT in most rooms, which is not true of every heater in this range. ⚠ Note 4000 K is the brightest, not 5000. ⭐ CRI ≥80 is adequate for general bathroom use and below what you would want at a mirror for close colour work, so a higher-CRI vanity light is worth having alongside if anyone does makeup in the room. ⭐ A 5-gang rocker wall switch is included, which is what four functions plus a light requires.

✅ What is published

Where it works

• ⭐ Bathrooms with a dedicated circuit — ⭐ plan it at rough-in.
• ⭐⭐ Rooms that steam up — ⭐ heat and extract at once.
• ⭐ Where the heater is the main light — ⭐ 2,100 lm.
• ⚠ Not ordered before checking the joists — ⭐ 595 mm.
• ⚠ Not on a long, bent duct run — ⭐ it will not clear steam.

Specifying it

4-in-1 bathroom heater — heater, exhaust fan, circulating fan and light. 2,250 W at 240 V AC, twin DC motors, 60 W. PTC element. 500 m³/h extraction, 150 mm duct. Light 1,800/2,100/1,900 lm at 3000/4000/5000 K, CRI ≥80. Cutout 595 × 280 mm, fascia 615 × 315 mm. 5-gang rocker wall switch, 3 m flexible duct and exterior grille included. 5-year warranty per the description spec block. ⛔⛔ ITS POWER FIELD PUBLISHES 25 W ON A 2,250 W APPLIANCE — the LED light's wattage, understated ninety times. Of 9 bathroom heaters where both figures can be read, 8 understate by more than tenfold and one, the STREAM, is correct — which is what makes the eight errors rather than a house convention. THE REAL LOAD IS 9.4 AMPS, 94% OF A STANDARD 10 A LIGHTING CIRCUIT ON ITS OWN, and nothing says it needs a dedicated one. ⭐⭐ ITS SHEET ALSO PUBLISHES A CUTOUT — 595 × 280 mm — WHERE 0 OF 843 RECORDS IN THIS CATALOGUE CARRY ONE. That figure decides the job: 595 mm is longer than the clear gap between joists at 450 mm centres, so it needs a joist trimmed and noggins added, and it cannot be corrected once cut.

Supplied and supported by Lights For You.

Download Datasheet (PDF)

Download Datasheet (PDF)