Hitachi Utopia IVX is a range of commercial outdoor units that Hitachi sells in the UK as micro VRF systems: one outdoor unit serving between one and four indoor units, each with its own control. The current UK line-up has two families. IVX Comfort runs on R410A, from 8 kW to 33.5 kW. IVX Prime runs on R32, from 5 kW to 20 kW, with a seasonal heating efficiency (SCOP) of up to 4.73.
This guide summarises what Hitachi publishes about the two ranges, where they fit, and what to consider when choosing, servicing or replacing a Utopia system.
At a glance
| IVX Comfort | IVX Prime | |
|---|---|---|
| Refrigerant | R410A | R32 |
| Capacity range | 8 kW to 33.5 kW | 5 kW to 20 kW |
| Indoor units | 1 to 4, individually controlled | 1 to 4, individually controlled |
| Efficiency (Hitachi) | SCOP up to 4.19, SEER up to 6.79 | SCOP up to 4.73 |
| Operating range (Hitachi) | Heating down to -20°C, optional cooling down to -15°C | See Hitachi's data |
| Piping (Hitachi) | Up to 100 m total, 30 m level difference | See Hitachi's data |
Source: Hitachi Cooling and Heating UK, IVX Comfort and IVX Prime product pages.
What Utopia IVX is
Utopia is Hitachi's long-running name for its commercial split outdoor units, and the IVX models are its inverter range. Hitachi now lists them under VRF systems as "micro side flow VRF": a compact outdoor unit, with a side-discharge fan like a split system, that can serve several indoor units like a VRF system. In the UK, Hitachi Cooling and Heating products are manufactured and sold by Bosch Home Comfort Group, which licenses the Hitachi trademark.
That makes IVX a middle ground between a single split and a full VRF system: suited to small offices, shops, restaurants and larger homes that need two to four rooms or zones on one outdoor unit. Our guide to VRF air conditioning explains how larger systems differ.
IVX Comfort
Hitachi's IVX Comfort page gives capacities from 8 kW up to 33.5 kW, a SCOP of up to 4.19 and a SEER of up to 6.79. Hitachi says it can heat in ambient temperatures down to -20°C, with optional cooling extended down to -15°C, which matters for server rooms and spaces that need cooling in winter. It supports total pipe runs of up to 100 m with level differences of up to 30 m, and connects up to four indoor units, each with individual operation and temperature settings. Hitachi also describes a GentleCool feature that adjusts the discharge air temperature to avoid cold draughts.
IVX Comfort uses R410A. That refrigerant is subject to the HFC phase-down, so it is worth factoring into long-term plans. Our guide to the R410A phase-out explains what it means for existing and new systems.
IVX Prime
Hitachi's IVX Prime page describes an R32 range from 5 kW to 20 kW with a SCOP of up to 4.73. Hitachi notes that R32 has a global warming potential nearly a third of R410A's, and that it needs a smaller refrigerant charge. Like the Comfort range, IVX Prime serves one to four indoor units with individual control, and Hitachi gives a minimum indoor unit capacity of 0.8 HP and an external static pressure of 30 Pa. Our guide to R32 refrigerant covers what R32 means for safety and servicing.
Choosing between them
- For new installations, the R32 IVX Prime is usually the more future-proof choice, because of its lower-GWP refrigerant and higher heating efficiency.
- For larger loads, IVX Comfort reaches higher capacities, up to 33.5 kW, and its long pipe runs suit buildings where the outdoor unit has to sit far from the indoor units.
- For year-round cooling, check the low-ambient cooling option, which Hitachi lists down to -15°C on IVX Comfort.
In every case, size the system from a proper heat load survey. Our guide to air conditioner sizing explains why.
Servicing and faults
Utopia systems use Hitachi's alarm codes, shown on the controller. Our guide to Hitachi error codes lists them from Hitachi's own service documents. Like any commercial system, Utopia units need regular cleaning of filters and coils, drain checks, and F gas leak checks where the system's size requires them. Hitachi publishes installation manuals and technical catalogues for the IVX Utopia range on its UK resources pages.
Our air conditioning repair and maintenance engineers work on Hitachi systems across London, and our commercial installation team can advise on replacing older Utopia units.
Questions people ask about Hitachi Utopia IVX
What is Hitachi Utopia IVX?
A Hitachi range of inverter outdoor units sold in the UK as micro VRF systems, serving one to four indoor units from a single outdoor unit, each with its own control.
What is the difference between IVX Comfort and IVX Prime?
IVX Comfort uses R410A and covers 8 kW to 33.5 kW. IVX Prime uses R32, covers 5 kW to 20 kW and has a higher SCOP of up to 4.73, according to Hitachi.
How many indoor units can a Utopia IVX run?
Hitachi says both IVX Comfort and IVX Prime support one to four indoor units, each capable of individual operation and temperature settings.
Does Utopia IVX work in cold weather?
Hitachi says IVX Comfort can heat in ambient temperatures down to -20°C, with optional cooling down to -15°C.
Who makes Hitachi air conditioning in the UK?
Hitachi's website says Hitachi Cooling and Heating products are manufactured and sold by Bosch Home Comfort Group, a trademark licensee of Hitachi.
The short version
Utopia IVX is Hitachi's micro VRF range: one outdoor unit for up to four individually controlled rooms. Choose the R32 IVX Prime for most new projects, or the R410A IVX Comfort where higher capacity or long pipe runs are needed, and size it from a proper survey.
Last updated: 4 November 2026
Written by
Ali Elm
Ali is the Head of Operations at Be Cool Refrigeration with over a decade of hands-on experience in HVAC and commercial refrigeration. He oversees every installation, repair, and maintenance project, making sure the work meets the highest standards. Ali holds full F-Gas certification and has worked across residential, commercial, and industrial refrigeration systems throughout London and the South East. When he is not on site, he writes these guides to help business owners and homeowners understand their cooling systems better.