Key Features

Key Features


  •  Manufactured in Australia 
  •  Enamel-Lined Water Tank The high-quality durable enamel coating reduces the risk of corrosion and water leakage.
  •  Side Fan Design: A design that provides maximum airflow and protects from the rain. 
  •  Micro-channel Technology: Provides a larger contact area to maximise heat transfer efficiency. The wrap-around design of the micro-channels enables installation in harsh water areas.
  •  Smart LED Controller Display: A bright interactive LED touchscreen display putting control at your fingertips. It provides optimum visibility, product performance, information, and user-friendly operation.
  •  Durable outer shell: Painted sheet metal design with an aluminium top cover to reduce corrosion and withstand harsh weather conditions.
  •  Suitable for Cold Climates: with an operating range from -6°C to +43°C.
  •  Suitable for harsh water conditions

*Warranty Details

  • 7 years cylinder supply
  • 3 years cylinder labour
  • 2 year parts supply and labour

*The warranty periods above apply to a single-family domestic dwelling only. Without limiting these 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 1st 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.

All other applications have a 3/1/1 warranty; 3-year cylinder supply, 1-year cylinder labour, 1-year parts, including labour.

** Testing condition: 19°C/15°C (Dry bulb/Wet bulb), relative humidity of 66% and heating water from 15°C to 60°C.

# Energy savings of up to 73.9% are based on Australian Government approved TRNSYS simulation modelling using a medium load in Zone 3 and apply when replacing an electric water heater of similar size with a Solahart 280HER24Heat Pump water heater. Any savings will vary depending upon your location, type of water heater being replaced, hot water consumption and fuel tariff. Before installation - seek advice as to suitability to household usage and tariffs. The impact on an electricity account will depend on the tariff arrangement of the water heater being replaced and where you live. The water heater is recommended for connection to an uninterrupted 24 hour continuous tariff power supply. Depending upon the size of the household and its hot water requirements and if the Electricity Retailer permits, an extended off-peak (overnight and day) or Extended time controlled power supply connection of a minimum 16 hours per day may also be suitable. Before purchase consult your energy provider for more information on cost comparisons.

^ Calculations based on 7 min showers at 42°C mixed water temperature in moderate climate, time of use tariff.


Solahart Atmos® Eco 280 Technical Specifications

Storage capacity  Litres  280
Boost capacity – by electric heating unit  Litres  236
Rated Heat Pump power input @ 240 V  Watts  690
Electric heating unit rating @ 240 V  Watts  2400
Maximum rated power input @ 240 V  Watts  3100
Recommended electrical circuit  Amps  15
Average Coefficient of Performance @ 19°C Ambient air temp & 10°C to 60°C water temp COP  5.2
People per household  Up to 5   
Dimensions and Specifications 
Tank height  mm  1832
Tank width  mm  690
Tank depth  mm  725
Heater weight – cartoned  kg  135
Heater weight – full  kg  402
Refrigerant  R290   
Maximum Refrigerant charge  gms  340
IP Rating  IP24   
Water Connections and Pressure Settings 
Inlet & Outlet  Rp 3/4   
Temperature Press Relief (TPR) Valve setting  kPa  1000
Expansion Control Valve (ECV) setting  kPa  850
Maximum mains supply pressure     
With expansion control valve  kPa  680
Without expansion control valve  kPa  800


** Testing condition: 19°C/15°C (Dry bulb/Wet bulb), relative humidity of 66% and heating water from 15°C to 60°C.

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.  

The Smart Way To Create Hot Water Out Of Thin Air

Atmos® Eco 280 Datasheet: Download

Atmos® Eco 280 Owner's Guide and Installation Instructions: Download