Solahart Atmos® Eco: Key Attributes

Key Features


A Solahart Atmos® Eco 180 Heat Pump is the smart choice for people who are looking for an energy-efficient alternative to a small to medium-sized electric water heater but are unable to install a solar water heater. It heats water by drawing heat from the surrounding air, is a reliable and efficient way to reduce energy consumption and cut greenhouse gas emissions, and is a sustainable way to reduce your water heating energy consumption without the need for rooftop solar collectors.

  •  High COP OF 4.5: Coefficient of Performance (COP) of 4.5@ 19oC.1
  •  Can save up to 70% on your water heating energy use: when compared to an electric water heater in Zone 3.2
  •  Suitable for cold climates: With an operating range from -7°C to +43°C. It is also suitable for harsh water conditions.
  •  Microchannel Technology: Provides a larger contact area to maximise heat transfer efficiency. The advanced wraparound design provides uniform and faster water heating.
  •  User-Friendly LED Controller Display: For easy operation. 
  •  Government Incentives: Eligible for STCs (may be eligible for additional incentives in some states).

*Warranty Details

  • 7 years cylinder supply
  • 3 years cylinder labour
  • 3 years sealed system supply and labour
  • 1 year parts supply and labour

*The warranty periods above apply to installations in a single-family domestic dwelling only. For further details, please refer to the Owner’s Guide. Without limiting the above periods, a 5-year whole-of-product warranty applies where a rebate has been received under Solar Victoria’s Solar Homes Program for installations from 1 July 2023. See the Solahart warranty set out in the Owner’s Guide and Installation Instructions. For more details call Solahart Australia 1300 769 475.

1 See datasheet for detailed specifications.

2 Energy savings of up to 70% in Zone 3 based on TRNSYS modelling on hot water energy consumption when replacing an electric water heater (min 16 hours/day). Any savings will vary depending upon your location, type of water heater being replaced, hot water consumption and fuel tariff.

Solahart Atmos® Eco 180 Technical Specifications


Storage Capacity (Litres) 178
Boost Capacity (litres) 168
Dimensions H x W x D (mm) 1810 x 532 x 576
Weight - Empty (cartoned)  (kg) 116
Weight - Full (kg) 284
Temperature Setting (°C) 60
Maximum Rated Power Input @ 240 V (Watts) 3500
Rated Heat Pump Power Input (Watts) 683
Refrigerant R134a
Element Size (kW) 2.4
Noise Rating @ 1 m [dB(A)] 48
IP Rating IP24
Average COP @ 19°C ambient air temperature & from 11.5°C to 60°C water temperature * 4.5
Average Peak Heat Pump Heating Capacity @ 19°C Ambient air temperature & from 11.5°C to 60°C water temperature * (kW) 3.1
Water Connections & Settings
Water Inlet/Outlet Connections Rp 3/4
Temperature Pressure Relief Valve Setting (kPa) 1000
ECV Setting (kPa) (not supplied) 850
Maximum Mains Supply Pressure
With ECV (kPa) 680
Without ECV (kPa) 800

* The COP of 4.5 is the average value measured under test conditions with an ambient air temperature of 19˚C/15˚C (Dry Bulb/Wet Bulb) over the entire heat-up process, heating of the water from 11.5˚C to 60˚C during water heater operation and a power supply of 240 V~ 50 Hz. The Heat Pump average heating capacity in Watts and its water heating capacity in Litres / hour were calculated from the results of this test. The heat pump water heater performance tests were conducted to AS/NZS 5125.1:2014. Note that the actual COP of the product at any given time will be impacted by a number of factors, including the ambient air and cold-water inlet temperatures at the place of installation and time of day/season of operation.

The Coefficient of Performance (COP) for a heat pump is the ratio of how much useful heat it produces for water heating to the power input into the water heater. The higher the COP number, the more efficient the heat pump is.

How Heat Pump Water Heaters Work

The efficient heat pump technology extracts energy from the surrounding air. Ambient warmth is used to convert the refrigerant within the sealed system into a gas. The gas is then compressed to generate even more heat, which then heats the water in the tank. What’s more, this process can work day or night, in sunshine and rain, all year round.

When hot water is drawn off, and cold water enters the tank, the thermostat activates the fan and the compressor. The operation of the compressor causes a pressure difference within the sealed refrigeration system. This pressure difference causes the refrigerant to move around the sealed system. The refrigerant enters the evaporator as a liquid. As the refrigerant absorbs heat from the atmosphere, it changes state, at low pressure, from a sub-cooled liquid to a super-heated vapour or gas (evaporates). The vapour then enters the compressor and obtains more heat, known as heat of compression, and passes into the heat exchanger as a super-heated vapour at high pressure.

As the refrigerant passes through the microchannel heat exchanger wrapped around the storage cylinder, it gives off heat, which is absorbed by the water inside the cylinder. As the refrigerant gives off heat, it cools and changes state back into a liquid (condenses). The refrigerant then enters the evaporator again, and the cycle is repeated. The resulting cold air is then discharged through the air outlets back into the atmosphere. This process continues whenever heating is required until the water in the storage tank reaches its hot water temperature set point.  

Introducing Solahart Atmos Eco 180 Heat Pump

Solahart Atmos® Eco Data Sheet: Download

Solahart Atmos® Eco Owner's Guide and Installation Instructions: Download