Looking for a versatile and energy-efficient way to heat and cool multiple rooms in your home? A Rinnai Pro Series Multi Split Heat Pump System may be the perfect solution. Whether you’re retrofitting an existing home or designing a new build, a multi split installation offers tailored comfort, lower running costs, and less exterior clutter — all powered by a single outdoor unit.
Let’s explore why multi split systems are a popular choice for New Zealand homeowners and how they compare to traditional heat pump setups.
Multi Split Heat Pump Installation
A multiroom heat pump system connects one outdoor unit to multiple indoor units, with each indoor unit controlled independently. This makes it an excellent choice for homes where family members have different comfort preferences.
It’s also ideal if you have limited exterior space and want to avoid the visual impact of multiple outdoor units around your home.
Indoor & Outdoor Unit Options
Rinnai Pro Series Multi Split Systems offer four different indoor unit types that can be combined in a variety of ways, allowing for up to six indoor units per system. These are paired with one of five outdoor units, with capacities ranging from 7.5 kW up to 17.0 kW, giving you flexibility to suit virtually any home layout or comfort requirement.
| Indoor Unit Type | Ideal Room / Application | Key Benefits | |
| Wall Mounted | Bedrooms, small living areas | Discreet, efficient, easy to control, mounted high for even airflow |  |
| Slim Ducted | Open-plan living, kitchens, hallways | Concealed in ceiling, minimal visual impact, distributes air through grilles |  |
| Compact Cassette | Large living areas, offices, open-plan spaces | Recessed in ceiling, 360° airflow, even temperature distribution |  |
| Floor Console | Lounges, offices, rooms with low wall height | Quick heating/cooling, flexible placement, ideal where wall mounting isn’t possible |  |
This setup is ideal when:
- You want climate control across multiple bedrooms, lounges, and workspaces (Note: fully independent zoning requires a 3rd party zone controller. All indoor units must be in the same mode (i.e. Heating or Cooling) but may have different set temperatures.)
- You have limited outdoor space for multiple units.
- You’re after a minimal, tidy look with fewer external fittings.
Explore the Rinnai Pro Series Multi Split System to see how it delivers quiet, high-performance heating and cooling across your home.
Installation Steps
Installing a Rinnai multi split heat pump involves:
- Planning the layout – A certified installer will assess the best type and location for each indoor unit, plus where to site the outdoor unit.
- Running refrigerant and electrical lines – These link each indoor unit back to the outdoor unit.
- Mounting the indoor units –
- Wall Mounted Units: positioned high on walls for even airflow.
- Slim Ducted Units: installed within the ceiling for discreet comfort.
- Compact Cassette Units: recessed into ceilings for 360° air distribution.
- Floor Consoles: mounted low on walls for quick, direct heating.
- Installing the outdoor unit – The unit should be on a level base or wall bracket with sufficient airflow.
- Testing and commissioning – The installer powers up and checks each connected room for correct operation.
Pro Tip: The outdoor unit should be mounted against an exterior wall, and it needs good ventilation, easy access for servicing, and adequate clearance.
Find a Multi Split System Installer
Multi split installations require specialist knowledge to ensure correct sizing, refrigerant handling, and warranty protection. Always use a qualified installer.
Need help? Rinnai has a trusted authorised installer network ready to assist.
Multi Split Heat Pump Cost
When considering a multi split heat pump system, it’s natural to ask about cost. While the upfront investment is higher than a single-room unit, the long-term value is significant thanks to consolidated installation, streamlined maintenance, and flexible comfort.
What Affects Installation Cost?
- Number of indoor units connected
- Distance between indoor and outdoor units
- House layout and accessibility
With just one outdoor unit serving multiple rooms, you save on labour, reduce exterior clutter, and simplify ongoing servicing.
FAQs
When is a multi split system most effective?
Perfect for:
- Multi-room heating and cooling
- Homes with separate living and working spaces
- Properties with limited outdoor unit space
- Households with different heating/cooling needs
How many rooms can a Rinnai Pro Series Multi Split serve?
Between two and six indoor units can connect to one outdoor unit.
Which indoor unit type is best for each room?
- Wall Mounted Units: great for bedrooms and smaller rooms.
- Slim Ducted Units: best for open-plan living or when you want a hidden, integrated system.
- Compact Cassette Units: ideal for large living areas or offices with ceiling space.
- Floor Consoles: perfect for rooms with limited wall height or where quick heating is desired.
What’s the best location for the outdoor unit?
Install in a spot that is:
- Well-ventilated
- Away from bedrooms for noise reduction
- Ideally shaded for efficiency
Can I install a multi split system myself?
No — heat pumps must be installed by a licensed professional. DIY installation risks safety issues, efficiency losses, and voided warranties.
Can I put an indoor unit anywhere?
Indoor units should have clear airflow and avoid obstructions like curtains or furniture. Outdoor units require adequate clearance and easy access for maintenance.
Take the Next Step
If you’re building, renovating, or upgrading your home, a Rinnai Pro Series Multi Split System offers tailored comfort, energy savings, and a clean, uncluttered look.
Explore the range here or contact a Rinnai-authorised installer to design the perfect multiroom climate solution for your home.
