LeoKlima
Toshiba
SEIYA 2 (R32)
- 3.3 kW
- Wi-Fi
- White
from 6,547 zł · incl. installation
View details →
Mitsubishi Heavy Industries
ZT
A white Japanese 3.5 kW wall-mounted unit from the new ZT series with built-in Wi-Fi, an Allergen Clear filter and heating operation down to -20 °C.
- Wi-Fi
- White
- Heating function
- Japanese technology
- Low noise
- Anti-allergen
- Cooling capacity
- 3.5kW
- Indoor unit noise
- from19dB(A)
- Heats in outdoor frost
- down to−20°C
Price incl. installation
Price on request
What installation includes
- Installation of the indoor and outdoor unit
- Up to a few metres of refrigerant, electrical and condensate routing
- Wall penetration and neat routing of the installation
- Carrying out the vacuum and checking the system for tightness
- Charging with refrigerant and starting the unit up
- Checking the operating parameters and configuring the controls
- Operating instruction and handover of the warranty documents
The SRK35ZT-WF is the indoor unit of Mitsubishi Heavy Industries' newest ZT series, added to the manufacturer's catalogue in 2026. The maker aims it at small and medium-sized rooms, and the variant described here, marked WF, comes in a white Pure White casing. It works with the outdoor unit SRC35ZT-W. The pair delivers a nominal 3.5 kW of cooling and 4.0 kW of heating, which suits a bedroom, a living room or a home office in a typical flat.
Three things set this model apart, and the sections below cover each one. First, the Wi-Fi interface is fitted at the factory, so there is no module to buy: you control the unit from the Smart M-Air app. Second, filtration comes in two parts, an Allergen Clear filter and a washable photocatalytic filter meant to reduce odours. Third, the winter operating range: heating is rated down to -20 °C outdoors, and with R32 refrigerant and a DC PAM inverter that leaves a sensible margin outside the core heating season too.
The efficiency figures are SEER 8.7 (class A+++) for cooling and SCOP 4.9 (class A++) for heating. The indoor unit weighs 11 kg and measures 870 × 230 × 290 mm, and its sound level ranges from 19 to 40 dB. The series also comes in black and titanium-black versions, but this page covers the white model only. We quote the installed price after a free assessment.
Overview and positioning
The ZT series is new in the Japanese manufacturer's range. The maker's website flags it as a novelty, and the catalogue places it in the premium class. In practice that means a unit which is not a bare-bones entry model, yet does not ask the user to master an elaborate system either: it has one capacity, 3.5 kW in the variant we describe, one outdoor unit, and every function available straight after installation.
Why present it as a proposal of its own? Because it combines three features that rarely come together in a residential split: Wi-Fi with no accessories, a filter designed with allergens in mind, and rated heating operation down to -20 °C. For a customer in Warsaw, where winter temperatures can fall hard, the last point matters if the air conditioner is meant to help with heating in spring and autumn, and occasionally on cooler winter days. For anyone comparing offers, it also means current technology from the 2026 catalogue rather than an older platform being cleared out, although availability of individual colours is worth confirming before you order.
We read the designation SRK35ZT-WF like this: SRK is a wall-mounted indoor unit, 35 stands for the capacity class of about 3.5 kW, ZT is the series name, and the WF ending signals the white colour and built-in Wi-Fi. We spell it out to avoid ordering mistakes, because the same series has other colour versions, and their indoor unit codes look slightly different.
Cooling and heating technology
At the heart of the system is a DC PAM inverter, which adjusts compressor speed smoothly instead of switching it on and off. Cooling capacity varies from 0.9 kW to 4.0 kW around the nominal 3.5 kW. In heating the range is 0.9 kW to 5.0 kW, with a nominal 4.0 kW. Such a wide span means that in a small room needing little energy the unit can run at a low level instead of cycling off, while in a heatwave it has reserve above the nominal figure. In a small bedroom this is easy to notice: once the room is warm, the unit steps down and holds the temperature rather than jumping between silence and full-speed effort.
The seasonal indicators tell the same story from the angle of the yearly bill: SEER 8.7 gives class A+++ in cooling, and SCOP 4.9 gives class A++ in heating. These are not figures to compare with a nominal efficiency at one operating point; they are averages calculated for a whole season under the European method, so they describe everyday use better. The refrigerant is R32, which the manufacturer describes as having a low GWP and high energy efficiency.
The outdoor temperature ranges are the most concrete argument for this model. Cooling is available from -15 to 50 °C, which helps, for example, in technical rooms or server closets where cooling is sometimes needed in winter. Heating works from -20 to 24 °C. Keep in mind that these are operating limits, not a promise of identical output across the range: in hard frost heating output naturally falls, so treat the unit as support, and in a very cold building always consider a primary heat source.
Comfort and air quality
The most interesting element for people with allergies is the Allergen Clear filter. According to the manufacturer it contains an enzyme and urea that deactivate allergens, bacteria, moulds and viruses caught on the filter. Next to it sits a photocatalytic deodorising filter that can be washed; the catalogue sheet lists it as an element that reduces odours. We call them filters because that is what they are: they do not replace ventilation or regular cleaning, but they complement both in a room where you spend many hours.
Alongside filtration there is the Allergen Clear Operation function, started with a button on the remote. It lasts 90 minutes and is meant for periods when you want extra cleaning of the air, for example after the pollen season. The second mechanism is Self Clean: after the unit switches off it dries its interior with the louvres closed, so the inside does not stay damp, which limits mould growth. The fan also has an antibacterial coating.
Acoustic comfort comes down to two numbers. The indoor unit runs between 19 and 40 dB, the lowest figure applying to the ultra-quiet speed and the highest to the strongest speed in heating. The outdoor unit reaches 50 dB. Gentle airflow is the job of Jet Air technology, which the manufacturer describes as a quiet stream with long reach, helping to spread air through the whole room without a cold jet aimed straight at a bed or an armchair. The direction of the airflow depends on the room layout, so during commissioning we help set an angle that keeps the stream away from where you sit or sleep.
Controls and Wi-Fi
This is where the model clearly stands out from many competitors. The WF variant has a Wi-Fi interface, which the manufacturer calls the Wireless Control System, built in at the factory. You do not need to buy an adapter or arrange a separate installation of it. After connecting to your home network, you control the unit through the Smart M-Air app, whether you are in another room or on the way home from work. In daily use you do not have to look for the remote just to change the temperature by a degree from the sofa or the bed.
The app lets you switch the air conditioner on and off, pick operating modes, set the temperature and programme timers. There is also an energy cost chart that shows how much electricity the unit uses, and Home Leave Mode for periods when you are away. An important caveat: the weekly timer in the ZT series works only from the Smart M-Air app, not from the remote. Anyone who likes to build a schedule for the whole week will therefore need to use a phone.
The wireless remote is still in the box and handles all basic functions, including starting Allergen Clear Operation. The brightness of the LED display on the indoor unit can be adjusted, which matters in a bedroom, where even a small light can interfere with falling asleep. When configuring the controls during installation we show how to pair the app with the unit and how to set the first schedule.
Design and build
The manufacturer describes the look of the ZT series as elegant and timeless. The SRK35ZT-WF described here has a white Pure White casing, so it fits most flats in Warsaw, where walls are usually painted in light colours. If you prefer a darker accent, the series also has black and titanium-black versions, but those are different unit codes and we do not describe them here.
The indoor unit is 870 mm wide, 230 mm deep and 290 mm high, and weighs 11 kg. It is a compact body that fits above a door or over a sofa without dominating the room. Before installation we check that the wall can take that weight and that there is room above the unit for free air intake and later access to the filters. In flats in older buildings, where walls can be uneven or made of panels, we pay special attention to this and choose fixings to suit the wall type.
Day-to-day use is helped by elements the manufacturer names directly: a washable deodorising filter that does not need replacing after every use, and display brightness control. The fan also carries an antibacterial coating. We do not treat these features as a reason to skip servicing, but as real conveniences that shorten routine cleaning.
Installation and service
In the standard scope, installation covers mounting the indoor unit and setting up the outdoor one, together with running up to a few metres of refrigerant, electrical and condensate lines. We make the wall passage, route the installation neatly, evacuate the system and check it for leaks, then charge it with refrigerant and start the unit. Finally we check operating parameters, configure the controls, including the app connection, show you how to operate the air conditioner, and hand over the warranty documents. Working time depends on conditions on site and on whether the line route matches what was agreed at the audit.
The manufacturer allows a maximum installation length of 20 m, so a typical flat leaves plenty of margin. We set the scope at a free audit, because that shows what is really needed. Possible surcharges are discussed before work begins: they concern a longer route, drilling through concrete or reinforced concrete, wall chasing, a condensate pump or work from a lift platform. We quote the installed price after a free assessment.
Running the unit is simple but needs regularity. Clean the washable filters according to the manual, more often rather than less in the busy season, and keep the outdoor unit free of leaves and snow. It is worth ordering a service once a year: checking the heat exchanger, the condensate drain and the electrical connections extends the life of the unit and catches small faults before they become breakdowns. If you notice a drop in performance or an odour from the airflow, do not wait for the annual service; get in touch sooner.
Who this model is for — summary
This air conditioner suits best a person who wants Wi-Fi connectivity without extra expense and without fiddling with adapters. If you like to start cooling from your phone before you walk into the flat, or check the energy cost chart, the built-in interface and the Smart M-Air app deal with it from day one. That applies especially to people who often come home late and do not want to enter an overheated room.
The second group is people with allergies and those sensitive to odours or damp indoors. The Allergen Clear filter, the washable deodorising filter, the 90-minute Allergen Clear Operation and the drying of the unit after use form a coherent set that supports air hygiene. It will not replace treatment or ventilation, but it makes it easier to keep the surroundings cleaner.
The third group is residents who want to use the air conditioner as an extra heat source in the shoulder months. The rated heating down to -20 °C and SCOP 4.9 give the unit sensible arguments here. If, however, you are after the cheapest model with no extra functions, this will not be the simplest choice. Book a free assessment: we will check the room and the installation route and match the capacity to the volume. Sizing matters, because an air conditioner that is too large or too small runs worse and louder than the catalogue data suggests.
Technical data
Specifications
| Model (indoor / outdoor unit) | SRK35ZT-WF / SRC35ZT-W |
|---|---|
| Cooling capacity (nom.) | 3.5 kW (range 0.9–4.0 kW) |
| Heating capacity (nom.) | 4.0 kW (range 0.9–5.0 kW) |
| SEER (cooling) | 8.7 — class A+++ |
| SCOP (heating) | 4.9 — class A++ |
| Refrigerant | R32 |
| Noise level (indoor, min.–max.) | 19–40 dB(A) |
| Noise level (outdoor) | 50 dB(A) |
| Indoor unit dimensions (W/D/H) | 870/230/290 mm |
| Indoor unit weight | 11.0 kg |
| Operating range (cooling, outdoor) | -15°C to +50°C |
| Operating range (heating, outdoor) | -20°C to +24°C |
| Max. pipe length | 20 m |
Questions
Frequently asked questions
Does this air conditioner heat in frost?
The manufacturer rates heating operation from -20 to 24 °C outdoors. In hard frost output falls, so treat the unit as an additional or transitional heat source rather than the only one in a very cold building.
Do I need to buy a separate Wi-Fi module?
No. The SRK35ZT-WF variant has the Wi-Fi interface built in as standard. You control it from the Smart M-Air app. The weekly timer is available only in the app, not on the remote.
How loud is it?
The indoor unit sound level is 19 to 40 dB depending on the speed, and the outdoor unit is 50 dB. The quietest speed is intended for the night.
What size is the indoor unit and how long can the installation be?
It measures 870 × 230 × 290 mm and weighs 11 kg. The manufacturer's maximum installation length is 20 m; we set the scope in your flat at a free audit.
Similar models
