Hitachi Cooling & Heating · Heat-pump or fixed-AC model
Yutaki S
Hitachi Yutaki S is a multi-generation split air-to-water family. Current MCS records give exact SCOP figures for R32 and R410A pairings, including separate S Combi forms.
Specifications
| Specification | Value |
|---|---|
| Type | air-source, split air-to-water |
| Supply phases | code-dependent single-phase and three-phase forms |
| SCOP (seasonal coefficient of performance) at 35°C | current exact MCS records span 3.49 to 4.55, with the value tied to the complete pairing |
| SCOP at 55°C | current exact MCS records span 2.81 to 4.55, with the value tied to the complete pairing |
| Maximum flow temperature (°C) | 60 maximum setting for the documented R32 R1E generation; continuous 60 from about -5 to 25°C outdoors, falling to 45 at -20°C |
| Heating-water temperature range (°C) | maximum setting 60 for the documented R32 R1E generation; the continuous boundary falls to 45 at -20°C outdoor |
| Domestic-hot-water temperature range (°C) | maximum setting 75 for the documented R32 R1E generation; the continuous heat-pump boundary is 55 from -5°C to 35°C, with the upper region requiring backup heat |
| Minimum operating temperature (°C) | -20 for the documented R32 R1E continuous space-heating envelope, with the water-temperature boundary falling at low ambient temperature |
| Refrigerant | R32 or R410A, depending on code generation |
| MCS certified | yes; exact Yutaki S and S Combi generation groups were current on 23 July 2026 |
Yutaki S is a split air-to-water family. Its exact identity combines a RAS outdoor unit with a RWM indoor water module. Yutaki S Combi instead uses a RWD indoor unit with an integrated domestic-hot-water tank.
Current certified generations
The MCS directory held four distinct current groups on 23 July 2026:
| Record generation | Exact pairing structure | Certificate groups and SCOP at 35°C / 55°C |
|---|---|---|
| 2019 R32 | RAS-2WHVRP/RWM-2.0NRE, RAS-2.5WHVRP/RWM-2.5NRE and RAS-3WHVRP/RWM-3.0NRE; S Combi uses matching RWD-NRWE 200S-K or 260S-K units | 041-K002-29 to 37; 4.52/3.32, 4.41/3.16 or 4.43/3.12 by size |
| 2021 R32 | RAS-2WHVRP1/RWM-2.0R1E, RAS-2.5WHVRP1/RWM-2.5R1E and RAS-3WHVRP1/RWM-3.0R1E; S Combi uses matching RWD-RW1E-220S-K units | 041-K002-48 to 50; 4.55/4.55, 4.16/3.16 or 4.12/2.92 by size |
| 2021 R410A | RAS-4/5/6WHVNPE single-phase or RAS-4/5/6WHNPE three-phase with matching RWM-N1E or RWD-NW1E-220S-K units; sizes 8 and 10 use three-phase RAS-WHNPE/RWM-N1E pairs | 041-K002-51 to 58; 3.49 to 4.19 / 2.81 to 3.25 |
| 2025 R32 | RAS-4/5/6WHVRP2E single-phase or RAS-4/5/6WHRP2E three-phase with matching RWM-R3E units; S Combi uses matching RWD-RW3E-220S(-K) units | 041-K002-73 to 75 a to d; 4.41/3.21, 4.41/3.18 and 4.41/3.18 |
Heating-only and cooling-kit forms are separate rows in several groups. The certificate suffix identifies that form even where its SCOP values are the same.
Water-temperature boundary
For the documented R32 R1E generation, 60°C is the maximum space-heating setting. The continuous boundary reaches 60°C from about -5°C to 25°C outdoors, then falls to 45°C at -20°C outdoors.
The domestic-hot-water graph has a 75°C maximum setting, but the continuous heat-pump region reaches 55°C from -5°C to 35°C outdoors. The region above it is backup-heater-only operation. Below -5°C, the setpoint must stay inside the continuous boundary if the domestic-hot-water electric heater is disabled. These limits apply to the documented R1E generation only.
Availability
All groups above had current certification records, but that does not confirm current UK supply for every pairing. New-supply availability remained unconfirmed at the review date.
Related entries
Manufacturer and reference sources
Reference type
Heat-pump or fixed-AC model
Last reviewed
23 Jul 2026
Current status
UK new-supply status is unconfirmed.