Rinnai HydraHeat™ Hot Water Heat Pump


The future of hot water

Rinnai are your experts in total home living; whether it's hot water systems, ducted heating or gas fires, we have a reputation for providing Kiwi families with the solutions they need for a healthy, comfortable, and sustainable way of living. 

 No matter the weather, Rinnai has a Heat Pump solution for every Kiwi home. The Rinnai Pro Series High Wall Heat Pump System provides both optimal heating and cooling all year round no matter where you live. Packed with innovative features including Wi-Fi connectivity, self-cleaning function and sleep mode, the Pro Series is the ultimate in providing complete comfort. This smart system can also work around your unique lifestyle with an ultra-practical timer function, allowing you to set the unit's operation times to achieve the perfect room temperature.

 Encased in a sleek contemporary design, the Rinnai Pro Series Heat Pump range is durable, convenient and easy to maintain.

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The Rinnai HydraHeat™ is designed primarily for outdoor installations. It may be possible to install internally if the proposed location is not an occupied space as defined by AS/NZS 5149, consult a qualified installer prior to installation.

Scope of use

Primarily designed for residential applications, but can be used for smaller commercial applications. Not suitable as a spa or swimming pool heater, or for hydronic applications. Hard and acidic water will need to be treated to use this product, refer water quality parameters in the support material (downloads).

* Compared with a standard hot water cylinder in Zone 5 (Auckland). Annual energy performance estimated according to AS/NZS4234:2008 and AS/NZS5125:2014, medium load size. ** Inlet water temperature 19°C, Outlet Water temperature 55°C, Dry Bulb Temperature 19°C. Accredited Testing to AS/NZS 5125 Pending by NATA accredited Provider.


Up to 75% Savings on Hot Water Costs*

Provides highly efficient water heating, minimising energy consumption and lowering operating costs.


Dedicated to Sustainability

Powerful to heat and cool fast, but also smart, seamless operation to maintain consistent temperature and reduce running costs.


Renowned Quality

Designed to keep noise levels to a minimum without affecting performance, thanks to its clever design optimised to deliver better air distribution.


Designed and built in NZ

Specifically designed for New Zealand climatic conditions (from -10°C to +42°C), as well as coastal locations. Operates in full heat pump mode right down to -10°C without the need for electric boosting.



The inbuilt electric element guarantees a consistent and dependable supply of hot water, at all times.


 Modular ‘Heat Pump Ready’ Design

Ability to upgrade from a standalone electric water heater to Heat Pump Technology with addition of Heat Pump unit.                                                                                                                                                               

 Modular ‘Heat Pump Ready’ Design

Removable Heat Pump unit allows for easy servicing, and ensures uninterrupted supply of hot water.                                                                                                                                                 

Frost Protection

Efficiently manages room humidity levels to ensure optimum comfort levels during humid summer days.                                                                                                             

 NZ MEPS Compliant

A delay ON or OFF timer allows you to select a period of time (from 30 minutes to 24 hours), the unit will turn either on or off depending on its current status.


User Freindly Control Interface

The Pro Series intelligent sleep mode operates on a two-way temperature control that modulates up and down to mimic outside ambient temperatures, ensuring a comfortable sleep.


Demand Control

Equipped with demand response capability (DRED) to help reduce overall power consumption at critical peak load times.**                                           


 Ideal for a Range of Residential Styles

Suitable for homes of 2–6 people. Plus an operating sound level of only 45dBA makes it suitable for a wide range of homes, including built-up residential areas.

technical Specifications

Model number / order code



Storage capacity

275 L



4.7 W/W (inlet water temp 19 ºC, outlet water temp. 55 ºC, ambient temp. 19 ºC) . Accredited Testing to AS/NZS 5125 Pending by NATA accredited Provider.


Rated heat pump input / output

802 W / 3725 W In standard, eco 50/55 modes, the heat pump provides 100% of the heating within the operating range. Outside these limits the electric element will operate.


Hot water recovery rate

89 L/h Recovery rate is calculated at Eco 55 mode, 19 ºC ambient temp., 41 ºC rise.


Cylinder element rating

2 kW


Cylinder construction



Operating temperature 

-10 to 42 ºC


Noise level

45 dB(A) Sound pressure level measured at 1 m distance from the water heater in a free field. Appliance operated in standard mode (60 ºC) at an ambient temperature of 19 ºC.


Refrigerant type

R290 / 150 g (A3 flammable)


People per household



Modes of operation

Standard (factory preset) water stored at 60 ºC
Boost, one off electric boost to 70 ºC
Eco 55, water stored at 55 ºC
Eco 50, water stored at 50 ºC
High usage, water stored at 70 ºC (heat pump + electric element)
Element only (heat pump turned off, electric element heats water to 70 ºC
Shutdown (in standby, heat pump and electric element are turned off)



Assembled: Height - 1750 mm, diameter 692 mm Heat pump header: Height 510 mm Cylinder: Height 1240 mm


Operating temperature 

Detailed specification information is available in the installation guide within the 'Downloads' tab.  


Water supply and connections

Min. inlet water pressure - 100 kPa TPR (supplied) - 850 kPa Cold water expansion valve - 700 kPa Pressure limiting valve - 500 kPa



Heat pump header - 36.4 kg (net), packaged 45 kg 
Cylinder - 77.1 kg (empty), 352.1 kg (full) 
Full system - approx. 400 kg


IP rating

IPX4 header and cylinder