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Sinclair
Marvin
The Sinclair Marvin 3.5 kW is a wall-mounted inverter with a geometric body, a UV-C lamp, a cold plasma generator, a humidity sensor and a Wi-Fi module.
- Wi-Fi
- White
- Heating function
- Low noise
- Cooling capacity
- 3.5kW
- Indoor unit noise
- from19dB(A)
- Heats in outdoor frost
- down to30°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
Sinclair describes the Marvin series as the peak of its wall-mounted range, combining precise performance, modern technology and a timeless design built on clean geometric lines. The 3.5 kW variant consists of the SIH-12BIM indoor unit and the SOH-12BIM outdoor unit. Cooling capacity is 3.5 kW (from 0.9 to 4.4 kW), heating capacity is 3.8 kW (from 0.9 to 4.7 kW), and the refrigerant is R32. The energy class is A++ for cooling and A+ for heating, with a SEER of 7.2 and a SCOP of 4.1.
What sets this model apart is above all its equipment for caring for the air and for convenience: a built-in UV-C lamp for air sterilisation, a cold plasma generator, a relative humidity sensor that lets it dehumidify to a set level, and seven fan speeds. Dual guide louvres are meant to direct the airflow more precisely, and a hidden display does not light up in the bedroom.
The indoor unit runs from 19 to 41 dB(A), is 837 mm wide and weighs 9.5 kg. We quote the installed price after a free assessment. During the visit we check whether the geometric, fairly distinctive body suits the wall it is to hang on, and whether the installation route fits within the maximum length the manufacturer specifies, 15 m.
Overview and positioning
The Marvin is best described through the manufacturer's own claim: a series with the highest specification, with a design built on clean geometric shapes, at the top of Sinclair's wall-mounted range. The manufacturer calls it a comfort solution, not merely a device for cooling. In practice that means a rich set of extra functions alongside energy figures that are good but not record-setting: a SEER of 7.2 and a SCOP of 4.1.
The 3.5 kW variant has a cooling capacity of 3.5 kW and a heating capacity of 3.8 kW in its data sheets. The modulation range is wide, because the compressor starts from 0.9 kW in both cooling and heating, and reaches a maximum of 4.4 kW in cooling and 4.7 kW in heating. A low minimum is an advantage in small, well-insulated flats, where the air conditioner needs to hold the temperature with low power rather than switching on and off.
The manufacturer also stresses what happens after the purchase: long-term availability of spare parts and technical support. That is not a parameter of the unit, but it is worth noting, because an air conditioner works for many years. Sinclair describes its business as a combination of good quality and a reasonable price; we quote no sums, because we set the installed price after a free assessment, once we know what scope of work is needed in your flat and which extra equipment makes sense. The Marvin is one of those models where the conversation about where to mount it matters as much as the conversation about parameters, because the distinctive body, the hidden display and the two-sided condensate outlet gain the most when the unit is well placed. That is why we arrive at the assessment with a tape measure and judge the actual wall, not a drawing from a catalogue.
Cooling and heating technology
The Marvin is an inverter air conditioner using R32, with class A++ in cooling (SEER 7.2) and A+ in heating (SCOP 4.1). The operating range in cooling is -15 to 50 °C outdoor temperature. For heating, the data we use give only the upper limit of 30 °C and no lower one, so we do not describe a specific frost range here: we confirm that value in the documentation before ordering, if you plan to use the unit in winter.
A particularly practical thing is the temperature setting in heating mode. The manufacturer records an adjustable heating range of 8–30 °C, which gives freedom both for keeping a little warmth in an empty flat and for heating to a comfortable temperature. Seven fan speeds let you tune noise and airflow intensity very precisely: from a quiet, barely perceptible movement of air at night to a strong blast when the flat is hot after a sweltering day. For someone who often changes settings during the day, such a fine scale is more convenient than a few coarse power steps.
For winter the manufacturer provided a compressor heater and a base heater in the outdoor unit, which protect against freezing of condensate. Also appreciate the function that limits the noise of the outdoor unit at night, in line with strict hygienic noise limits: that matters if the outdoor unit hangs beneath a bedroom window. The outdoor unit's noise is 52 dB(A), and this function lets you reduce it in the hours when it disturbs most. A modulation range from 0.9 kW in both modes means that on milder days the compressor can run evenly, without frequent switching on and off, which favours both quiet and a stable temperature. In cooling the unit reaches 4.4 kW, so it has reserve for hot afternoons when the sun strongly heats the room.
Comfort and air quality
The Marvin has two complementary mechanisms for caring for the air. The first is a cold plasma generator, listed among the standard equipment. The second is an integrated UV-C lamp for air sterilisation, which according to the manufacturer ensures a higher level of purity. We treat neither as a substitute for filtering and regular cleaning, but together they make a solid set for people sensitive to air quality in a bedroom.
Another addition is the relative humidity sensor. It lets the unit dehumidify the air precisely, to a desired level, which matters in summer, when muggy air tires you more than the temperature itself. The manufacturer describes this as accurate dehumidification to the desired level, not just a side effect of cooling, so on hot, humid days the unit can work mainly on humidity comfort. The I FEEL function, as in other air conditioners that have it, relates the temperature to the place where the remote is, instead of to the unit itself; we discuss the details at commissioning.
In terms of noise, the indoor unit runs from 19 to 41 dB(A), from almost inaudible to clearly audible. The additional louvres (dual guide louvres) direct the air more accurately, and the hidden display means there is no needless light in the room at night. For restful sleep that is a bigger advantage than it might seem on paper. The UV-C lamp and plasma work as a supplement, so they do not excuse you from cleaning the filters; it is still the filters and the heat exchanger that decide how clean the air is after a few months of operation. It is also worth airing the room regularly, because an air conditioner circulates the air but does not replace it.
Controls and Wi-Fi
Among the Marvin's standard functions the manufacturer lists a Wi-Fi module, and describes the remote as the YAA1FB18 model with Wi-Fi support. The module is therefore part of the standard equipment and not an add-on, and it lets you control the air conditioner from a phone. We configure the network connection at commissioning, so that after installation the unit is ready straight away.
For more extensive installations the manufacturer provided for the connection of external controllers, and lists a dry door contact in the equipment. This is a solution found where an air conditioner is to work with another system, for example with a reed switch on a balcony door or with building automation. In an ordinary flat it is usually not needed, but it is worth knowing the possibility exists.
In daily use the simpler things decide: seven fan speeds, the adjustable heating range of 8–30 °C and the hidden display. At handover we will set them up with you and show you how to use the humidity sensor and the UV-C lamp. If more than one person is going to use the flat, it is worth deciding who manages the app and the remote. If you plan to use the dry contact, tell us before the quote so that we prepare the right wiring and include it in the scope of work.
Design and build
The Marvin relies on clean geometry: a plain body without ornament. The indoor unit is 837 mm wide, 293 mm high and 200 mm deep, and weighs 9.5 kg. The version described here is white. The manufacturer offers the series in several colour variants; among those listed are white, silver, champagne and navy, so if you want a colour other than white, ask us about availability.
The hidden display is both a design and a comfort element: while the unit is running, the front stays smooth, with no glowing digits. The dual condensate outlet on both sides (left or right) makes it easier to fit the installation to the layout of the room, which in demanding interiors can matter.
A properly planned installation lets you make the most of the body. The unit looks best when it hangs on a smooth wall with good clearance from the ceiling and furniture; too tight a spot spoils both the look and the effectiveness of the louvres. That is why at the free assessment we measure the spot carefully and, if necessary, suggest another location. The Marvin is also a unit for which it pays to route pipes and cables evenly and neatly, because the clean form of the unit contrasts sharply with visible, carelessly laid installations. With this body every detail counts, from the mounting height to the distance from the corner, so we plan everything before drilling the first hole.
Installation and service
As part of installing the Marvin we mount the indoor unit and position the outdoor unit, run up to a few metres of refrigerant, electrical and condensate lines, make the wall passage and lay the installation neatly. We pull a vacuum, check the system for leaks, charge it with refrigerant and start the unit. Then we check the operating parameters, configure the controls and go through the operation, after which we hand over the warranty documents.
The maximum installation length given by the manufacturer is 15 m, so we plan the route with particular care, measuring the real distance between the place for the indoor and outdoor units and not just the straight-line distance. We set the scope of work at a free assessment, and any surcharges are discussed before work starts: a longer run, drilling through concrete or reinforced concrete, chasing channels into walls, a condensate pump or work from a lift platform. With a limit of 15 m it is especially easy to exceed the permitted distance, so it is better to check it before the purchase than after delivery.
Servicing an air conditioner with a UV-C lamp and a plasma generator covers the usual things, namely cleaning the filters and an annual service, plus a check of the heat exchangers, the condensate and the connections. The manufacturer stresses that it cares about long availability of spare parts and about technical support, which makes it easier to keep the unit in good condition for many years. We recommend a service before the cooling season. We also check then that the condensate drain is clear on the chosen side, because with a two-sided outlet it is easy to make a mistake in the configuration after changes in the flat, for example after a renovation. If something turns up that needs repair during the service, we tell you before starting work.
Who this model is for — summary
The Sinclair Marvin is for people who value extra equipment and a distinct, geometric design: a UV-C lamp, a plasma generator, a humidity sensor, a hidden display and seven fan speeds. It suits a bedroom and a living room in a modern interior, where the air conditioner should look deliberately chosen and not accidental. It is also a sensible choice for people who want a say over air humidity and like to set the airflow exactly. A wide modulation range and a low minimum noise level suit a flat in which the air conditioner often works in the background at low load.
If, however, the lowest electricity bill is what matters most, look at models with a SEER higher than 7.2 and a SCOP higher than 4.1. Consider another model also if the installation route would exceed 15 m, or if you want to use the unit mainly in winter in hard frost and need a confirmed lower limit of operation in heating.
The best step is a free assessment. We will measure the room, judge the route and the place for the outdoor unit, and tell you plainly whether 3.5 kW is the right output. We quote the installed price after a free assessment.
Technical data
Specifications
| Model (indoor / outdoor unit) | SIH-12BIM / SOH-12BIM |
|---|---|
| Cooling capacity (nom.) | 3.5 kW (range 0.9–4.4 kW) |
| Heating capacity (nom.) | 3.8 kW (range 0.9–4.7 kW) |
| SEER (cooling) | 7.2 — class A++ |
| SCOP (heating) | 4.1 — class A+ |
| Refrigerant | R32 |
| Noise level (indoor, min.–max.) | 19–41 dB(A) |
| Noise level (outdoor) | 52 dB(A) |
| Indoor unit dimensions (W/D/H) | 837/200/293 mm |
| Indoor unit weight | 9.5 kg |
| Operating range (cooling, outdoor) | -15°C to +50°C |
| Operating range (heating, outdoor) | null°C to +30°C |
| Max. pipe length | 15 m |
Questions
Frequently asked questions
How quietly does the Sinclair Marvin run?
The indoor unit runs from 19 to 41 dB(A) and the outdoor unit reaches 52 dB(A). The manufacturer also lists a function that lowers the noise of the outdoor unit at night.
Does this air conditioner have Wi-Fi?
Yes, the manufacturer lists the Wi-Fi module among the standard functions, and the YAA1FB18 remote is described as a Wi-Fi model. We set up the network at commissioning.
How does it heat in frost?
Heating capacity is 3.8 kW with a SCOP of 4.1, and the adjustable heating temperature range is 8–30 °C. The data we use give no lower limit of outdoor temperature for heating, so we confirm it in the documentation before ordering.
What size is the indoor unit and how long can the installation be?
The indoor unit is 837 mm wide, 293 mm high, 200 mm deep and weighs 9.5 kg. The maximum installation length is 15 m, and we agree the actual scope of work at a free assessment.
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