Avalla Dehumidifiers Compared: X-300, X-350, X-125 & X-200

If you have been searching for an Avalla dehumidifier, you have probably noticed the range can be confusing. There are two generations: the current X-300 and X-350, and the earlier X-125, X-150 and X-200. Then there is the S-200, which is a portable air conditioner with a dehumidifier built in. The model numbers do not make the differences obvious, and the prices do not climb in the order you would expect.

This guide does not repeat every spec sheet; each model has its own page for that. Instead it answers the three questions that decide the purchase: which model fits your room, what it costs to run, and whether the older models are still worth buying.

Avalla in brief

Avalla is a UK-focused brand built around damp control and indoor air quality. All of its dehumidifiers are compressor units using R290 refrigerant, and every one of them will tackle condensation and mould and dry laundry indoors. The differences come down to capacity, room size, noise and running cost.

The range has moved on. The X-300 and X-350 are the current models. The older X-125, X-150 and X-200 are currently unavailable on Amazon UK, so for most buyers the choice is really between the two current units, with the S-200 as the option if you want cooling too.

The Avalla range at a glance

Model	Extraction	Room coverage	Noise	Power draw	Status
X-300	10L/day	Up to 38 m²	30 dB	0.16 kW	Current
X-350	12L/day	Up to 46 m²	30 dB	not reliably published	Current, adds an ioniser
X-125	12L/day	Up to 30 m²	42 dB	0.21 kW	Earlier model
X-150	16L/day	Up to 46 m²	48 dB	0.24 kW	Earlier model
X-200	20L/day	Up to 50 m²	48 dB	0.32 kW	Earlier model
S-200	24L/day	Up to 85 m²	—	—	3-in-1 with 9,000 BTU cooling

Which Avalla fits your room?

Room coverage is the figure to match first. Measure the floor area of the space you are treating (length × width) and pick the smallest model that covers it with some headroom, because a unit working at its limit runs longer, louder and costs more.

Your space	Floor area	Best current pick	Why
Bedroom, home office, box room	Under 20 m²	X-300	Far more than enough, and 30 dB is quiet enough to leave on overnight
Large lounge, open-plan kitchen-diner, 1-bed flat	20–38 m²	X-300	Still inside its 38 m² rating
2-bed flat, or a lounge plus hallway	38–46 m²	X-350	The only current model rated past 38 m²
Whole 3-bed house, cellar with real damp	46–50 m²	X-350, or an X-200 if you find one	The X-200 has the most extraction, but it is not currently in stock
Large open space, or damp in winter and heat in summer	Up to 85 m²	S-200	Much larger coverage, and cooling as well

A note on garages and outbuildings. Like every compressor dehumidifier, these lose effectiveness in the cold, and the X-125 is rated for a minimum of 16°C. For an unheated garage in winter, a desiccant dehumidifier is the right tool rather than any model here.

What does an Avalla cost to run?

This is the part manufacturer pages skip. The table below uses each model's rated power draw at 25p per kWh, the rate behind Avalla's own "around 4p an hour" figure for the X-300. Swap in your own tariff if it differs.

Model	Power draw	Per hour	8 hours a day	Per month (8 hrs/day)
X-300	0.16 kW	4p	32p	about £9.60
X-125	0.21 kW	5.3p	42p	about £12.60
X-150	0.24 kW	6p	48p	about £14.40
X-200	0.32 kW	8p	64p	about £19.20

These are worst-case figures. With the humidistat set to around 50–55%, the compressor switches off once the room reaches your target, so real running costs are usually well below this once the initial damp has been cleared. Setting the target lower than you need is the single biggest way to push the bill up.

Litres per unit of electricity. Dividing daily extraction by daily power use gives a rough efficiency figure: the X-150 comes out best at around 2.8 litres per kWh, the X-300 and X-200 at around 2.6, and the X-125 at around 2.4. The differences are small. In practice, quieter and cheaper per hour matters more to most households than a few percent of efficiency, which is why the X-300 is the default recommendation.

The current models

Avalla X-300: the default pick. 10L a day, up to 38 m², 30 dB and the lowest running cost in the range. It has a humidity sensor, laundry and sleep modes, a 24-hour timer and continuous drainage. The one weakness is a small 2L tank, so if you are fighting real damp, plan to use the drainage hose. There is no app or WiFi.

Avalla X-350: more coverage, plus an ioniser. 12L a day and up to 46 m² at the same 30 dB, with a built-in ioniser for air purification. It costs around £10 more than the X-300. Treat the "99.9% of bacteria and viruses" claim as a manufacturer figure rather than an independent test. If you only need damp control in one room, the X-300 is better value.

Are the older models still worth buying?

Only at the right price, and only for a specific reason, because the current pair beat them on noise and running cost.

X-125: its advantages are a larger 2.5L tank and a 2m drainage hose in the box. Otherwise the X-300 does the same job more quietly (30 dB against 42 dB) and more cheaply.
X-150: it extracts 16L a day against the X-350's 12L at the same 46 m² coverage. Worth it for a genuinely damp house if you find one in stock; otherwise the X-350 is quieter.
X-200: still the most extraction Avalla offer outside the S-200, at 20L a day. Worth it for serious whole-home damp, but it draws twice the X-300's power and is currently unavailable.

Why the old pricing looks backwards. Remaining stock of the earlier models has been listed with the small X-125 priced above the larger X-200. That reflects end-of-line stock, not a real price ladder, and it is not a sign that the X-125 is the better machine.

The S-200: when you want cooling too

The Avalla S-200 is a 9,000 BTU portable air conditioner that also runs as a 24L/day dehumidifier and a fan, covering up to 85 m². It is the largest and most expensive unit in the range because it is three appliances in one. If you battle damp in winter and heat in summer, it can replace two purchases. If you only need damp control, any of the dedicated dehumidifiers above is cheaper to buy and run.

Frequently asked questions

Which Avalla dehumidifier is the quietest? The current X-300 and X-350, both rated at 30 dB. That is quieter than the 42 dB X-125 that previously held the title, and it is the main practical reason to choose the current generation for a bedroom or home office.

What is the difference between the Avalla X-300 and X-350? The X-350 extracts 12L a day against the X-300's 10L, covers up to 46 m² against 38 m², and adds a built-in ioniser. It costs around £10 more. If you only need damp control, the X-300 is the better value.

Should I buy the X-300 or the older X-125? The X-300 on almost every measure: it is quieter, cheaper to run and usually cheaper to buy. The X-125's advantages are a larger 2.5L tank and a drainage hose in the box, which matter less if you plan to use continuous drainage anyway.

How much does an Avalla dehumidifier cost to run? At 25p per kWh, from about 4p an hour for the X-300 up to about 8p an hour for the X-200. Running eight hours a day, that is roughly £9.60 to £19.20 a month, and less in practice once the humidistat starts cycling the compressor off.

What size Avalla dehumidifier do I need? Match the room coverage to your floor area. Under 38 m², the X-300. Between 38 and 46 m², the X-350. Above that, the X-200 if you can find one, or the S-200 up to 85 m².

Do any Avalla dehumidifiers have an app or WiFi? No. Not the X-300, the X-350, or the X-125 despite the "smart" in its name. Across the range, "smart" describes the automatic humidistat. All control is on the unit itself.

Where can I find the Avalla X-125 manual? Avalla publish the user manual for each model on their own site under the product's support section, and a copy ships in the box. It covers the control panel, the drainage hose fitting and filter cleaning.

What is the difference between the Avalla X-200 and the S-200? The X-200 is a dedicated 20L dehumidifier. The S-200 is a 3-in-1 that also provides 9,000 BTU air conditioning and a fan mode, so it costs more but covers summer cooling as well.

Prices and availability change often. Check the latest price on each product page before you buy.