---
product_id: 63150376
title: "OS20 Solar Air Heater & Dehumidifier - 525 kWh, up to 30 m2"
brand: "nakoair"
price: "¥243626"
currency: JPY
in_stock: true
reviews_count: 11
category: "Nakoair"
url: https://www.desertcart.jp/products/63150376-os20-solar-air-heater-and-dehumidifier-525-kwh-up-to
store_origin: JP
region: Japan
---

# 10°C temperature rise on sunny days Solar-powered, zero grid cost 88 m³/h airflow for fresh ventilation OS20 Solar Air Heater & Dehumidifier - 525 kWh, up to 30 m2

**Brand:** nakoair
**Price:** ¥243626
**Availability:** ✅ In Stock

## Summary

> ☀️ Warm your space, cool your worries—solar-powered comfort redefined!

## Quick Answers

- **What is this?** OS20 Solar Air Heater & Dehumidifier - 525 kWh, up to 30 m2 by nakoair
- **How much does it cost?** ¥243626 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/63150376-os20-solar-air-heater-and-dehumidifier-525-kwh-up-to)

## Best For

- nakoair enthusiasts

## Why This Product

- Trusted nakoair brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Versatile & Portable:** Perfect for homes, cabins, workshops, caravans, and more—anywhere you need fresh, warm air without electricity.
- • **Breathe Healthier Air:** Advanced dehumidification and ventilation reduce moisture, mold, and harmful indoor pollutants like formaldehyde and benzene.
- • **Smart Climate Control:** Mechanical thermostat automatically stops the fan at your set temperature, maintaining optimal comfort effortlessly.
- • **Harness the Sun’s Power:** Enjoy free, eco-friendly heating with integrated solar collectors that run independently of the grid.
- • **Energy Efficient & Cost Saving:** Provides an estimated 525 kWh energy supplement per year, cutting heating bills while boosting indoor air quality.

## Overview

The Nakoair OS20 Solar Air Heater is a cutting-edge, solar-powered ventilation and dehumidification system designed for up to 30㎡ spaces. It delivers up to 88 m³/h of fresh air, raising indoor temperature by approximately 10°C on sunny days, while automatically managing humidity and harmful indoor pollutants. Fully independent of the grid, it’s ideal for residential and off-grid applications, offering a sustainable, cost-effective solution for healthier indoor climates.

## Description

Nakoair OS20 Solar Air Heater & Dehumidifier - 525 kWh, up to 30 m2 | Mechanical thermostat, dehumidification and up to 525 kWh per year of solar heat for rooms up to 30 m² : desertcart.co.uk: DIY & Tools

Review: Also this would be ideal for mobile homes and sited caravans - I bought this as a supplementary heater for my bathroom it’s half the size of this heaters max room size. This heater could be so much better, if the fan speed was relevant to the outside temperature as well as the room or if you could manually adjust the speed of the fan on the thermostat, I believe it would produce more heat also the internal vent cover could be better ( I did try a louvred type though the fan didn’t open them, I’m sure it will on full power ) I’m currently restricting the air flow slightly in a bid to increase the temperature. Looking at previous models, the photovoltaic panel was separate, this to me was a much better option as in my case the sun won’t be shining on the panel after about13:00, ( the fan works better in full sun ), Then I could’ve placed the photovoltaic panel for optimum max sun.
Review: It warms up my van no problem... - It works boss

## Features

- SUN ONLY: ventilate, dehumidify, humidify - solar air heating with no electricity cost in solar mode, for a healthy indoor climate. Under clear skies the Nakoair OS20 blows warmed air into the room - up to 525 kWh of heat a year at 88 m³/h, for rooms up to 30 m2. Supply air is 5-30 °C above the intake air; the rise follows the airflow. A PV panel drives the fan, so no mains connection is needed. Without sun it stands still, though weak winter sun still runs it.
- DRY, NOT MUSTY: ventilating and heating in a single pass - around 2 hours for one air change, humidity 40-70 %. Electric dehumidifiers ice up below 15 °C and keep drawing power. A musty smell is usually the first warning before damage becomes visible. Ventilation and dehumidification in one unit - cellar, garage, garden room, workshop, holiday home, camper van, even without power. It dries by moving air and adding warmth. Keeps the air dry: less moisture and fewer stale odours.
- FRUGAL AND BATTERY-FREE: solar products are kind to the environment and cut CO₂. Less airflow means a higher temperature and less fan noise; more airflow means more heat output and more dehumidification. The thermostat needs no battery: once the set room temperature is reached, the fan stops. Low voltage instead of an open flame, no smoke in the room. The fan knows only two states: on in the sun, off without it.
- ON THE WALL IN ABOUT AN HOUR: 135 mm hole saw, brackets, air duct and all accessories are included; for timber and stud walls a cordless driver is enough. The collector stays outside, the air outlet inside. Toughened solar glass with 92 % light transmission is supplied.
- ROBUST, QUIET, LONG-LASTING: Built to ISO 9806; a lower airflow keeps the noise down. Sunon double-ball-bearing fan rated at 70,000 hours with a 40,000-hour manufacturer warranty; fitted in about an hour, a part swapped in around 30 minutes. An independent laboratory confirms heat output, resistance to breakage and stability, solar radiation, rain water, frost and mechanical load. Maintenance-free in operation.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B075GDBDFG |
| Air Flow Capacity | 88 Cubic Metres Per Hour |
| Best Sellers Rank | 930,745 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 1,462 in Dehumidifiers |
| Brand | Nakoair |
| Brand Name | Nakoair |
| Colour | Black |
| Country of Origin | China |
| Customer Reviews | 3.8 out of 5 stars 60 Reviews |
| Floor Area | 30 Square Meters |
| Floor area | 30 Square Meters |
| Included Components | Mechanical thermostat and mounting accessories |
| Item Dimensions D x W x H | 6D x 72W x 101H centimetres |
| Item Highlight | Mechanical thermostat, dehumidification and up to 525 kWh per year of solar heat for rooms up to 30 m² |
| Manufacturer | Oscar Science & Technology Co., Ltd. |
| Material | Aluminium |
| Model Name | OS20 |
| Model Number | OS20 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Number of Speeds | 8 |
| Number of speeds | 8 |
| Operation Mode | Standard |
| Other Special Features of the Product | Automatic Moisture Removal |
| Part Number | OS20 |
| Product dimensions | 6D x 72W x 101H centimetres |
| Recommended Uses For Product | Commercial, Residential |
| Special feature | Automatic Moisture Removal |
| UPC | 763383115111 717877246072 |
| Upper Temperature Rating | 30 Degrees Celsius |
| Voltage | 12 Volts |
| Wattage | 560 watts |

## Product Details

- **Brand:** Nakoair
- **Capacity:** 42 litres
- **Colour:** Black
- **Floor area:** 30 Square Meters
- **Included components:** LCD thermostat, solar collector
- **Material:** Aluminium
- **Number of speeds:** 1
- **Product dimensions:** 72D x 101W x 6H centimetres
- **Recommended uses for product:** Residential
- **Special feature:** Automatic Moisture Removal, Portable

## Images

![OS20 Solar Air Heater & Dehumidifier - 525 kWh, up to 30 m2 - Image 1](https://m.media-amazon.com/images/I/71O+8qvrcbL.jpg)
![OS20 Solar Air Heater & Dehumidifier - 525 kWh, up to 30 m2 - Image 2](https://m.media-amazon.com/images/I/71AtjOXrWbL.jpg)
![OS20 Solar Air Heater & Dehumidifier - 525 kWh, up to 30 m2 - Image 3](https://m.media-amazon.com/images/I/61HLTe4eLOL.jpg)
![OS20 Solar Air Heater & Dehumidifier - 525 kWh, up to 30 m2 - Image 4](https://m.media-amazon.com/images/I/81H4xgVIM2L.jpg)
![OS20 Solar Air Heater & Dehumidifier - 525 kWh, up to 30 m2 - Image 5](https://m.media-amazon.com/images/I/81df6+9w8AL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Reviewer disappointed with charges?  are you non eu?  also, does this item work?  it looks excellent, drill a hole stick it on a wall, then forget.**
A: EU item does Work

## Customer Reviews

### ⭐⭐⭐⭐⭐ Also this would be ideal for mobile homes and sited caravans
*by D***1 on 17 March 2023*

I bought this as a supplementary heater for my bathroom it’s half the size of this heaters max room size. This heater could be so much better, if the fan speed was relevant to the outside temperature as well as the room or if you could manually adjust the speed of the fan on the thermostat, I believe it would produce more heat also the internal vent cover could be better ( I did try a louvred type though the fan didn’t open them, I’m sure it will on full power ) I’m currently restricting the air flow slightly in a bid to increase the temperature. Looking at previous models, the photovoltaic panel was separate, this to me was a much better option as in my case the sun won’t be shining on the panel after about13:00, ( the fan works better in full sun ), Then I could’ve placed the photovoltaic panel for optimum max sun.

### ⭐⭐⭐⭐⭐ It warms up my van no problem...
*by R***S on 9 May 2019*

It works boss

### ⭐ Extra charges
*by J***T on 16 July 2018*

The product it's self is a good sturdy product and I was going to order more but given the fact that I've been hit by additional charges regarding import and clearance I'm disappointed all round unhappy with lack of interest in resolving

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-10-29*