ULTRAMIST 4.5 L Ultrasonic Air Humidifier - Indoor Growing

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VENTILATION AND CLIMATE

ULTRAMIST 4.5 L Humidifier: Full Humidity Control from Cutting to Harvest

In indoor growing, light only does half the job. If relative humidity in your grow room drops away, the plant closes its stomata, transpiration stalls and assimilation slows down — no matter how much PPFD your horticultural lamp delivers. BloomLED selected the ULTRAMIST 4.5 litre ultrasonic humidifier for exactly this reason: it produces a fine, steady, near-silent cold mist that can hold a small to medium grow space inside its target relative humidity band. Touch LCD display, remote control included, 30 W on the meter and a 4.5 litre tank: set it, forget it, and let your plants get on with it.

ULTRAMIST 4.5 litre ultrasonic air humidifier for indoor grow rooms - BloomLED

Technical specifications

Specification	Value
Device type	Ultrasonic cold mist humidifier
Tank capacity	4.5 litres
Power draw	Approx. 30 W
Power supply	100-240 V — 50/60 Hz (standard mains socket)
Display	Touch LCD screen
Remote control	Included
Recommended humidity range	40 to 60 % RH
Aromatherapy function	Yes — essential oil compatible
Heating element	None — cold mist
Unit dimensions	20 x 20 x 27 cm
Weight	1.5 kg
Recommended space	Small to medium indoor grow spaces
Reference	HUMI-ULTRAM-4500
EAN13 code	3701058846608

4.5 LTank

30 WPower draw

40-60 %Target RH

1.5 kgWeight

What makes the ULTRAMIST 4.5 L stand out

💧 Genuinely quiet ultrasonic cold mist

A piezoelectric membrane breaks the water into microdroplets without ever heating it. There is no boiling element and no noisy blower, and the mist disperses without creating a cold spot. You can run it around the clock in a living space without the noise becoming an issue.

🌱 The right humidity for every stage

Cuttings want 70-80 % RH, vegetative growth 60-70 %, and flowering steps back down to 40-50 % to keep dense buds out of trouble. The adjustable output on the ULTRAMIST lets you follow that descending profile across the whole cycle without ever drowning your grow room.

🎛️ Touch LCD screen and included remote

The touch panel shows operating status at a glance, and the remote means you no longer open the tent just to nudge a setting. Fewer openings means fewer temperature and humidity swings for your plants, and a noticeably more stable climate overall.

⚡ Only 30 W — efficiency where it counts

At around 30 watts, the ULTRAMIST barely registers on an indoor grow electricity bill, especially compared with a warm steam humidifier. It is a negligible running cost for a direct agronomic return in plant vigour and canopy uniformity.

🧴 Built-in aromatherapy function

Outside your growing cycles, the unit takes a few drops of essential oil to scent a room. Because there is no heating element, the aromatic compounds are not degraded by heat. A genuine second use that keeps the purchase working for you all year.

Setup, tuning and maintenance

Place the ULTRAMIST on a flat, stable surface, slightly raised off the grow room floor and away from power supplies, ballasts and sockets. Aim the nozzle into the airflow of your circulation fan rather than straight at the foliage: the mist should be picked up and diluted into the air volume, never deposited as droplets on the leaves where it would encourage fungal problems. A hygrometer positioned at canopy height remains your best ally for validating the real reading rather than the theoretical setting.

When it comes to control, think in stages. For cuttings and early vegetative growth, target 70-80 % relative humidity to compensate for a root system that cannot yet feed the plant. Through vegetative growth, 60-70 % RH keeps VPD comfortable and transpiration active. As flowering begins, bring it gradually down to 40-50 % RH, and stay at the lower end during the final weeks to protect dense flowers. The unit is built to hold that 40-60 % RH band reliably in a small or medium space.

Maintenance determines how long it lasts. Fill it with demineralised or reverse osmosis water wherever possible: hard water leaves limescale on the membrane and throws a fine white dust over nearby equipment. Empty and rinse the tank once a week to stop bacteria developing in standing water, using a mild non-corrosive product and rinsing thoroughly. If scale does build up, a diluted white vinegar soak on the transducer restores the original output. The complete absence of a heating element mechanically limits failure points and makes this a genuinely durable investment.

A high-performance horticultural lamp only delivers its full potential if humidity keeps up: below 30 % RH the plant closes its stomata and stops using the light you are paying for. The ULTRAMIST 4.5 L is the cheapest way to lock that variable down.

Frequently asked questions

What humidity should I target at each growth stage?

Aim for 70-80 % RH for cuttings, 60-70 % RH through vegetative growth, then 40-50 % RH in flowering. This gradual decrease tracks root system development and reduces botrytis risk on dense flowers. The ULTRAMIST comfortably covers the recommended 40-60 % RH band in a small to medium grow space.

Which water should I use to avoid white dust?

Use demineralised or reverse osmosis water. Ultrasonic humidifiers throw dissolved minerals out along with the water vapour, which produces that characteristic white film on equipment and clogs the piezoelectric membrane. With low-limescale water the problem disappears and cleaning intervals get considerably longer.

Do I also need a circulation fan?

Yes, it is strongly recommended. Without air movement the mist falls and creates saturated zones at floor level while the canopy stays dry. A circulation fan evens out the air, prevents condensation on the walls and lets the humidifier work far less for a more consistent result. It is the classic pairing in any well-tuned grow room.

Is it noisy when running continuously?

No. Ultrasonic technology uses neither a heating element nor a compressor: the mist is generated by high-frequency vibration, which makes operation very discreet. That matters a great deal for grows set up in a living room, office or bedroom, where a noisy humidifier quickly becomes unbearable.

✓ Fast dispatch from France✓ 2-year legal warranty✓ BloomLED technical advice✓ Specialist growshop for over 10 years

Specific References
EAN13	3701058846608

Reference HUMI-ULTRAM-4500

Experience optimal comfort with the ULTRAMIST Air Humidifier, featuring a 4.5-liter capacity to combat dry air in your home or office, promoting health and relaxation for your family during winter months.