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Make efficient use of warmth from the surrounding air with the Rinnai HydraHeat. Available in 275L and 340L sizes, this integrated heat pump water heater offers a practical alternative to traditional electric storage water heating. It requires electricity but does not rely on direct sunlight.
275L Or 340L NZ-Built Heat Pump Head R290 Refrigerant Electric Backup ElementChoose the capacity that suits your household’s hot water demand. The 340L option provides more stored water, which may be useful where several people shower close together or baths add to daily consumption.
| Specification | 275L | 340L |
|---|---|---|
| Model Code | RHPN361A275E20 | RHPN361A340E20 |
| Storage Capacity | 275 litres | 340 litres |
| Rinnai Household Guide | 2–5 people | 2–7 people |
| Estimated Full Heating Time* | Approximately 3 hours 5 minutes | Approximately 3 hours 50 minutes |
| Assembled Dimensions | 1750mm high × 692mm diameter | 1995mm high × 692mm diameter |
*Heating time conditions: Calculated using Rinnai’s 89L/hour recovery rate in Eco 55 mode, at 19°C air temperature, heating water from 19°C to 55°C. These are estimates, not guaranteed heating times. Heating to a higher temperature or starting with colder water will take longer. Household size recommendations also depend on individual hot water use.
For an off-grid installation, have your installer assess the electrical demand against your inverter, battery storage and available generation. Backup and higher-temperature modes can increase electricity use.
HydraHeat is primarily designed for outdoor residential installation. Water quality must meet Rinnai’s requirements; hard or acidic water may need treatment. It is not intended for swimming pool, spa or hydronic heating applications.
Have the system installed by qualified professionals. Your installer should assess the location, airflow, service access, drainage, water supply and electrical requirements before installation.
As a general budgeting guide, allow approximately $2,000–$4,000 for installation. This is an indicative allowance, not a fixed quote. Complex installations or electrical upgrades may cost more. Obtain a tailored quote for your property.
Need Help Choosing? Rinnai Manuals & Downloads| Rated Heat Pump Input / Output | 802W / 3725W |
| Electric Element | 2kW |
| Recovery Rate | 89L/hour under the Eco 55 conditions specified above |
| Coefficient Of Performance | 4.7 under Rinnai’s specified test conditions |
| Heat Pump Operating Range | −10°C to 42°C |
| Refrigerant | R290 |
| Heating Modes | Standard, Boost, Eco 55, Eco 50, High Usage and Element Only |
Choose either 275L or 340L using the size selector on this page before adding the product to your cart.
Under the Eco 55 conditions shown in the comparison table, allow approximately 3 hours 5 minutes for the 275L or 3 hours 50 minutes for the 340L.
These estimates apply to heating the whole tank from 19°C to 55°C. They do not represent heating from colder water to the Standard mode temperature of 60°C. Weather, starting water temperature, selected mode and hot water drawn during heating will affect the result.
It needs electricity to operate. The heat pump draws warmth from the surrounding air, so direct sunlight is not required.
It may be suitable where the power system can support its electrical demand. Discuss heat pump operation, backup element use and your preferred heating schedule with your installer before choosing a system.
Consider shower duration, baths and how many people use hot water close together. The larger tank gives you more stored water, but your installer should assess both capacity and recovery time against your daily routine.
It can operate in heat pump mode within its specified temperature range. Cold conditions can affect heating performance. Your installer should also assess any frost protection needed for exposed plumbing.
Rinnai advertises savings of up to 75%, based on its specified comparison with a 250L electric cylinder heating water from 19°C to 55°C. This is not a guaranteed saving for every home.
Your results will depend on hot water consumption, climate, electricity tariffs, selected operating modes and the system being replaced.
It is primarily designed for outdoor installation. Any proposed indoor location needs assessment by a qualified installer against Rinnai’s installation requirements before purchase.
Allow approximately $2,000–$4,000 as a general budgeting guide. The actual cost depends on the work required at your property. Obtain a tailored quote from your local qualified installer.
Rinnai advertises a five-year heat pump unit warranty and a seven-year cylinder warranty. Coverage and conditions vary by component; refer to Rinnai’s full warranty terms for details.
Choosing the right water heater depends on household demand, available power and installation requirements. Contact The Off Grid Store if you need help comparing the 275L and 340L options.
Contact UsWe get it. You've got a lot of choice when it comes to online retailers.
Here's why we think you should shop with us at The Off Grid Store.
We can deliver to almost anywhere in New Zealand, unfortunately there are a few exceptions such as Chatham Islands and for larger items and Great Barrier Island. Best prices online guaranteed.
30 Day Easy Returns. Not happy with your product, we'll take it back no
questions asked.
Great Service. We pride ourselves on the best service, anywhere.
Your Satisfaction Guaranteed. We handpick our products for quality, we
know you'll love them. But if there is ever something wrong, we'll fix it.
| Rinnai | N & S Island | N & S Island Rural |
|---|---|---|
| 16L A Series Infinity LPG Exterior | $25.00 | $30.00 |
| 20L A Series Infinity LPG Exterior | $25.00 | $30.00 |
| 24L A Series Infinity LPG Exterior | $25.00 | $30.00 |
| 26L A Series Infinity LPG Exterior | $25.00 | $30.00 |
| Rinnai EF26 Condensing CF External LPG | $25.00 | $30.00 |
| Rinnai HydraHeat® Integrated Hot Water Heat Pump | From $100 | Call for Quote |
Make efficient use of warmth from the surrounding air with the Rinnai HydraHeat. Available in 275L and 340L sizes, this integrated heat pump water heater offers a practical alternative to traditional electric storage water heating. It requires electricity but does not rely on direct sunlight.
275L Or 340L NZ-Built Heat Pump Head R290 Refrigerant Electric Backup ElementChoose the capacity that suits your household’s hot water demand. The 340L option provides more stored water, which may be useful where several people shower close together or baths add to daily consumption.
| Specification | 275L | 340L |
|---|---|---|
| Model Code | RHPN361A275E20 | RHPN361A340E20 |
| Storage Capacity | 275 litres | 340 litres |
| Rinnai Household Guide | 2–5 people | 2–7 people |
| Estimated Full Heating Time* | Approximately 3 hours 5 minutes | Approximately 3 hours 50 minutes |
| Assembled Dimensions | 1750mm high × 692mm diameter | 1995mm high × 692mm diameter |
*Heating time conditions: Calculated using Rinnai’s 89L/hour recovery rate in Eco 55 mode, at 19°C air temperature, heating water from 19°C to 55°C. These are estimates, not guaranteed heating times. Heating to a higher temperature or starting with colder water will take longer. Household size recommendations also depend on individual hot water use.
For an off-grid installation, have your installer assess the electrical demand against your inverter, battery storage and available generation. Backup and higher-temperature modes can increase electricity use.
HydraHeat is primarily designed for outdoor residential installation. Water quality must meet Rinnai’s requirements; hard or acidic water may need treatment. It is not intended for swimming pool, spa or hydronic heating applications.
Have the system installed by qualified professionals. Your installer should assess the location, airflow, service access, drainage, water supply and electrical requirements before installation.
As a general budgeting guide, allow approximately $2,000–$4,000 for installation. This is an indicative allowance, not a fixed quote. Complex installations or electrical upgrades may cost more. Obtain a tailored quote for your property.
Need Help Choosing? Rinnai Manuals & Downloads| Rated Heat Pump Input / Output | 802W / 3725W |
| Electric Element | 2kW |
| Recovery Rate | 89L/hour under the Eco 55 conditions specified above |
| Coefficient Of Performance | 4.7 under Rinnai’s specified test conditions |
| Heat Pump Operating Range | −10°C to 42°C |
| Refrigerant | R290 |
| Heating Modes | Standard, Boost, Eco 55, Eco 50, High Usage and Element Only |
Choose either 275L or 340L using the size selector on this page before adding the product to your cart.
Under the Eco 55 conditions shown in the comparison table, allow approximately 3 hours 5 minutes for the 275L or 3 hours 50 minutes for the 340L.
These estimates apply to heating the whole tank from 19°C to 55°C. They do not represent heating from colder water to the Standard mode temperature of 60°C. Weather, starting water temperature, selected mode and hot water drawn during heating will affect the result.
It needs electricity to operate. The heat pump draws warmth from the surrounding air, so direct sunlight is not required.
It may be suitable where the power system can support its electrical demand. Discuss heat pump operation, backup element use and your preferred heating schedule with your installer before choosing a system.
Consider shower duration, baths and how many people use hot water close together. The larger tank gives you more stored water, but your installer should assess both capacity and recovery time against your daily routine.
It can operate in heat pump mode within its specified temperature range. Cold conditions can affect heating performance. Your installer should also assess any frost protection needed for exposed plumbing.
Rinnai advertises savings of up to 75%, based on its specified comparison with a 250L electric cylinder heating water from 19°C to 55°C. This is not a guaranteed saving for every home.
Your results will depend on hot water consumption, climate, electricity tariffs, selected operating modes and the system being replaced.
It is primarily designed for outdoor installation. Any proposed indoor location needs assessment by a qualified installer against Rinnai’s installation requirements before purchase.
Allow approximately $2,000–$4,000 as a general budgeting guide. The actual cost depends on the work required at your property. Obtain a tailored quote from your local qualified installer.
Rinnai advertises a five-year heat pump unit warranty and a seven-year cylinder warranty. Coverage and conditions vary by component; refer to Rinnai’s full warranty terms for details.
Choosing the right water heater depends on household demand, available power and installation requirements. Contact The Off Grid Store if you need help comparing the 275L and 340L options.
Contact UsWe get it. You've got a lot of choice when it comes to online retailers.
Here's why we think you should shop with us at The Off Grid Store.
We can deliver to almost anywhere in New Zealand, unfortunately there are a few exceptions such as Chatham Islands and for larger items and Great Barrier Island. Best prices online guaranteed.
30 Day Easy Returns. Not happy with your product, we'll take it back no
questions asked.
Great Service. We pride ourselves on the best service, anywhere.
Your Satisfaction Guaranteed. We handpick our products for quality, we
know you'll love them. But if there is ever something wrong, we'll fix it.
| Rinnai | N & S Island | N & S Island Rural |
|---|---|---|
| 16L A Series Infinity LPG Exterior | $25.00 | $30.00 |
| 20L A Series Infinity LPG Exterior | $25.00 | $30.00 |
| 24L A Series Infinity LPG Exterior | $25.00 | $30.00 |
| 26L A Series Infinity LPG Exterior | $25.00 | $30.00 |
| Rinnai EF26 Condensing CF External LPG | $25.00 | $30.00 |
| Rinnai HydraHeat® Integrated Hot Water Heat Pump | From $100 | Call for Quote |
