Skip to main content
snowflakeaircon.sg
CallWhatsApp

Hitachi RAM-Z23C2MS

The outdoor unit of a 4.99 kW multi split system, rated 5 green ticks. Costs about $42 a month to run — here is how that compares with every other system its size on Singapore's NEA register.

Is the RAM-Z23C2MS expensive to run?

No, it's one of the cheaper ones its size. Of the 10 systems on Singapore's register around this size, 1 cost less to run.

Runs at

$42/month

About $508 a year

Cheapest its size

$42/month

Midea MABOD-18E

Size group

4.6–5.4 kW

10 systems, all brands

That is about $1 a month more than the cheapest system its size, or roughly $100 over ten years — before you weigh purchase price, which often runs the other way.

Looking at the RAM-Z23C2MS for your home?

This is the outdoor unit only, and on a multi-split it is shared across rooms. What decides the job is what goes inside them.

What to pin down before you commit

  • One indoor model number per room, not just a room count
  • The capacity of each indoor unit, and which room it serves
  • Whether every room can run at once at full output, or the system is sized for typical use
  • What happens to the existing piping and drainage, and whether it is being reused

A multi-split can be built many ways, and the register carries one figure per registration. The running cost above is for the configuration NEA tested — yours depends on how many indoor units end up on it and how hard they work.

Figures are NEA energy-label records checked 17 Sept 2026, priced at the label's 27¢/kWh assumption. Your own bill depends on how you actually use it. Already have one installed and seeing a fault code? Look it up here, or Compare every registered model. More on Hitachi systems, or read up on Common aircon problems.

Hitachi RAM-Z23C2MS questions

What size home is the RAM-Z23C2MS suited to?
The NEA register lists it at 4.99 kW of cooling capacity for the configuration it tested. That output is shared across the rooms it serves, so have the installer size it against the whole layout, not one room.
What does the 5-tick rating on the RAM-Z23C2MS mean?
The NEA energy label rates it 5 of 5 green ticks, in the upper band for tested efficiency. Ticks describe energy use under the label test, not cooling strength, so compare it with units of the same size.
Is the RAM-Z23C2MS a single-split or multi-split system?
It is the outdoor half of a multi-split, listed at 4.99 kW on the register, able to run several indoor units. The register covers the outdoor unit, so settle the indoor model numbers and how many rooms run at once before comparing quotes.
Is the Hitachi RAM-Z23C2MS still on the NEA register?
Yes. Its registration runs to 21 April 2027, more than four months after the 17 September 2026 snapshot this page is built from.
How efficient is the RAM-Z23C2MS at part load?
NEA records a part-load COP of 6.41 for the RAM-Z23C2MS. Part-load efficiency describes how it performs when it is not running flat out, which is how it runs most of the time in a home.

Ready to get started?

Tell us what’s going on. Symptoms, setup, photos, anything we should know. We’ll assess and come back with the right next step.

WhatsApp us