Efficient Heating for Every Home
Discover the Future of Hot Water Heating
Transform your home with cutting-edge hot water heat pumps designed for maximum efficiency and sustainability.
Hot Water Heat Pump
The Smarter Hot Water Solution
Looking for a more cost-effective and sustainable way to heat your home’s water? The HydraHeat Hot Water Heat Pump from Rinnai combines the efficiency of heat pump technology with a reliable hot water cylinder to deliver a very clever solution.
Hot water heat pumps, sometimes called hybrid heat pumps or heat pump water heaters, are designed to efficiently heat water for domestic and commercial use. They operate on the same principle as air source heat pumps, which extract heat from the surrounding air. This warms the water in the cylinder which is then supplied into your home or commercial space.
By installing a hot water heat pump system on your new property or upgrading from a conventional cylinder, you could save up to 75% on your water heating costs* compared to traditional systems. This highly efficient water heating solution minimises energy consumption and lowers operating costs, resulting in a more sustainable choice for your home.
Unmatched Energy Efficiency
Our heat pumps use advanced technology to significantly reduce energy consumption, saving you money on utility bills.
Cost-Effective Heating
Experience substantial cost savings with our heat pumps, which are designed to provide affordable heating solutions.
Eco-Friendly Technology
Reduce your carbon footprint with our environmentally friendly heat pumps, contributing to a greener planet.
Designed for New Zealand Conditions
HydraHeat® Integrated, HydraHeat® Split and Enviroflo™ GR Series hot water heat pumps are purpose-built for New Zealand homes. Designed for efficiency, compliance, and performance even in harsh conditions (HydraHeat® operates down to -10°C in full heat pump mode), they can reduce your water heating energy use by up to 75%* compared to traditional electric cylinders. The HydraHeat head unit was specifically designed and built right here in New Zealand for our unique climatic conditions.
- Wide Operating Range: It operates in full heat pump mode down to and up to , without the need for electric boosting.
- Frost Protection: Built-in defrost and frost protection functions are included to handle colder climates.
- Quiet Operation: With a low operating sound level of only , the HydraHeat is suitable for a wide range of homes, including built-up residential areas.
Smart & Efficient Technology
The HydraHeat operates much like a refrigerator in reverse, utilising the surrounding air’s ambient temperature and amplifying this energy to heat water.
- High Performance: The 275L and 340L models both have an impressive Coefficient of Performance (COP) of . This means for approximately.
- of power input, it can generate of heating energy.
- NZ MEPS Compliant Cylinder: The cylinder meets the Minimum Energy Performance Standard (MEPS), resulting in less heat loss and a more efficient product.
Reliability and Versatility
The system is built for dependable performance and flexible use.
- Consistent Supply: The inbuilt electric element guarantees a consistent and dependable supply of hot water, at all times.
- 6 Operation Modes: You can choose from six versatile operating modes: Standard, Boost, Eco 55, Eco 50, High Usage, and Element Only.
- User-Friendly Control: A dedicated control interface features an OLED screen for easy use.
- Suitable for All Water Areas: Featuring an enamel cylinder with a magnesium anode, the system is suitable for effortless use in both hard and soft water areas.
- Modular Design: The modular ‘Heat Pump Ready’ design allows for upgrading from a standalone electric cylinder by adding the heat pump unit.
- Easy Servicing: The heat pump unit is removable, which allows for easy servicing while ensuring an uninterrupted supply of hot water.
Commitment to Sustainability
The HydraHeat uses R290 refrigerant with a low global warming potential. The nominal charge is only
Rinnai HydraHeat® Integrated Hot Water Heat Pump
The experts in water heaters and heat pumps have combined the technology of both to bring you a very clever solution – a Hot Water Heat Pump called HydraHeat®.
Technical Specifications
275L – RHPN361A275E20
340L – RHPN361A340E20
275 L & 340 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 by NATA accredited Provider.
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., 36 ºC rise.
Cylinder element rating
2 kW
Cylinder construction
Enamel
Head unit data label position
Positioned on the divider panel between the fan and compressor—to the right of the control panel.
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 (nominal charge)
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)
Dimensions
- Assembled: 275L – height 1750 mm, Ø692 mm, 340L – height 1995mm, Ø692 mm
- Heat pump header: Height 510 mm
- Mains pressure hot water cylinder
- 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
- Full system – 275 L approx. 388 kg, 340 L approx. 465 kg
IPX4 header and cylinder
Rinnai Enviroflo™ GR Series Hot Water Heat Pumps
Storage capacities / order codes
215L – EHPG215VM
265L – EHPG265VM
300L – EHPG300VM
COP
215L: 4.0
265 and 300L: 4.1
Performance estimated according to AS/NZS 5125:2014.
COP measured at the following conditions: Inlet water temp. 19°C, outlet water temp. 55°C, dry bulb temp. 19°C.
Heat pump operation limits
-7 °C to 45 °C
3.3 kW / 1.1 kW
46 dB(A)
Approx. 66 L/hr
(19°C ambient, 36°C rise)
Vitreous enamel
2.4 kW
Refrigerant type
215L: R290 / 355 g
265-300L: R290 / 395 g
- Standard
- Eco
- Hybrid
- Electric
- Vacation
| Model | Diameter | Height | Weights empty / filled |
| EHPG215VM | Ø640 mm | 1875 mm | 109 kg / 324 kg |
| EHPG265VM | Ø640 mm | 1933 mm | 120 kg / 400 kg |
| EHPG300VM | Ø640 mm | 2055 mm | 124 kg / 424 kg |
- Hot outlet / cold inlet ¾ ” RP
- TPR ½ RP
- Condensate 19 mm tapered connection
3091 kPa
1000 kPa / 10 kW
13.5 A (15 A plug fitted)
IP24
Ready to Transform Your Home?
Join the growing number of satisfied homeowners who have made the switch to energy-efficient hot water heat pumps. Enjoy lower energy bills and a more comfortable home environment. Contact us today to learn more about our installation services!
