# Humidifier Dreo 4L HM420S — 4 L tank, ultrasonic, adjustable mist output

**URL:** https://aio.lv/en/product--dreo-0810181280258--11656525
**Data updated:** 2026-04-14 14:20 (EEST)
**Category:** Other goods
**Manufacturer:** Dreo
**Manufacturer code:** 0810181280258
**EAN:** 0810181280258
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 78.49 €
**Prices and availability valid until:** 2026-08-10 23:59
**Price without VAT (21%):** 64.87 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--dreo-0810181280258--11656525

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 27.07.2026 | free |
| Pickup points | 30.07.2026 | 1.89 EUR |
| Courier delivery to door | 30.07.2026 | 4.99 EUR |

## Summary description

Dreo 4L HM420S is an ultrasonic humidifier with a 4-litre water tank designed to raise indoor humidity for comfortable living and better respiratory comfort. It offers adjustable mist output, quiet operation and continuous runtime suitable for bedrooms, offices and living rooms. Easy to fill and clean, it helps reduce dry air symptoms and protects wooden furniture and houseplants.

## Long description

The Dreo 4L HM420S is an ultrasonic humidifier with a 4-litre water tank designed to increase indoor humidity levels to improve comfort and respiratory ease. It delivers adjustable mist output and quiet operation to suit bedrooms, living rooms and offices. The device provides continuous runtime suitable for overnight use or extended daytime operation, and features a simple top-fill design that makes refilling and routine cleaning straightforward.
Advantages
The unit uses ultrasonic technology to produce fine mist with low noise, enabling operation during sleep or work without disturbance. Adjustable mist output allows control of humidity intensity to match room size and personal preference. A large 4 L tank extends runtime and reduces the need for frequent refills. The humidifier’s compact footprint and easy-to-clean reservoir support straightforward maintenance and placement in a variety of indoor spaces.
Suitable for
Bedrooms to support comfortable sleep and reduce dry throat or nasal irritation
Living rooms to protect wooden furniture and houseplants from dry air
Home offices to maintain a comfortable working environment and prevent dry skin
Small to medium-sized rooms where continuous humidification is needed
When it may not be suitable
This humidifier is intended for small to medium-sized indoor spaces; it may not be suitable as the sole humidification solution for very large open-plan areas or commercial spaces that require higher output. It is not a replacement for devices with integrated air purification or heating functions, so users needing combined air treatment should consider multifunction units instead.
Key specifications
Water tank capacity: 4 litres
Technology: ultrasonic mist generation
Adjustable mist output for customized humidity control
Quiet operation suitable for night-time use
Continuous runtime designed for extended use between refills
How to use
Fill the removable reservoir with clean tap or filtered water up to the indicated level and place it back on the base. Select the desired mist output setting to match room size and personal comfort; lower settings conserve water and operate more quietly while higher settings increase humidity more quickly. Place the humidifier on a flat, stable surface clear of walls and electronics, and ensure adequate room ventilation. Follow the manufacturer’s cleaning guidance regularly to prevent scale and bacterial buildup in the tank and ultrasonic transducer.
What to consider before purchase
Room size and humidity needs — ensure the unit’s capacity and output match the intended space
Water quality — mineral-rich water can cause scale; consider using filtered or distilled water if necessary
Maintenance requirements — regular cleaning is necessary to maintain performance and hygiene
Usage recommendations
For best results, place the Dreo 4L HM420S on an elevated, water-resistant surface away from direct contact with electronics and wood surfaces. Run the unit on a lower mist setting during sleep and increase output briefly if rapid humidity adjustment is required. Empty and dry the tank if the humidifier will be unused for several days to prevent microbial growth.

## FAQ

### How much does the Humidifier Dreo 4L HM420S cost, and is it available for purchase?

The price is 78.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 72 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 27.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

### Can Humidifier Dreo 4L HM420S be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Dreo products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Dreo service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty