Enviroflo GR Series 300L

Heat Pump hot water units operate using the same technology as reverse cycle air conditioners.

They use a refrigerant gas that absorbs heat from the surrounding air. Through a reverse cycle refrigeration process, this heat is transferred to the water via a heat exchanger. The system continues circulating until the water in the storage tank reaches the set temperature.

This method is highly energy-efficient because it uses ambient air to heat water, even in cooler conditions, without relying solely on electric heating elements.

Yes. Rinnai Heat Pumps are designed to operate efficiently in all regions of Australia.

Your geographical location and installation site conditions (such as ambient temperature and airflow) may affect how quickly the system reheats water, so it’s important to ensure the tank is correctly sized for your household’s needs.

With multiple operating modes and Wi-Fi control options, you can also customise the system’s performance to suit your hot water usage and local climate conditions.

In larger homes with multiple bedrooms and bathrooms, it may be beneficial to install more than one Heat Pump to ensure consistent hot water supply throughout the house.

There are many factors to consider when sizing a hot water system for your home. If you're unsure which heat pump system is right for you contact one of our hot water specialists to request a quote here.

Below is a break down of the Rinnai Heat Pump range for sizing comparisons. Refer to the product pages for a complete breakdown of the range.

• Models Enviroflo S 5.0kw: 250L → up to 5 people | 315L → up to 6 people.

• Enviroflo S 7.0kw: 250L → up to 5 people | 315L → up to 6 people | 400L → up to 8 people.

• Enviroflo AR Series: 300L → up to 6 people | 340L → up to 7 people.

• Enviroflo GR Series: 215L → up to 4 people | 280L → up to 5 people | 300L → up to 6 people.

• Enviroflo A Series: 180L → up to 3 people.

• Enviroflo 265L: 265L → up to 5 people.

• Hotflo Plus 250L: 250L → up to 5 people.

All Heat Pumps make some noise while heating water.

However, Rinnai Heat Pumps are incredibly quiet, even when compared to other brands. Their sound level typically sits around 45–46 decibels, which is about the same as:

• A quiet conversation.

• The hum of a refrigerator.

• A peaceful library environment.

This means Rinnai Heat Pumps are well-suited for residential areas where low noise is important.

The recovery rate of our Heat Pumps – meaning the time it takes to reheat water back to its set temperature – can vary based on several factors:

• Ambient air temperature: Heat pumps draw warmth from the surrounding air. The colder the air, the longer it takes to recover.

• Model type: Different models have different heating capacities and efficiencies.

• Usage patterns: The amount of hot water used and the time of day can also affect recovery time.

Because of these variables, we’re unable to provide a single recovery rate figure. For detailed specifications and performance data, we recommend visiting the Heat Pump product page or contact Rinnai Customer Service for model-specific guidance.