Streamline 322MLV
The Solahart 322MLV is a 320-Litre split system with advanced freeze protection, designed for families of up to 6 in colder Australian climates.
Streamline 322MLV: Key Attributes
Why Streamline 322MLV is a smart choice
The 322MLV is one of Solahart’s largest MDV split systems, offering a 320L ground-mounted storage tank paired with a roof-mounted L collector. It’s tailored for larger households needing consistent hot water while minimising energy bills and environmental impact.
This model includes integrated freeze protection and is suitable for installations up to 600 metres above sea level, delivering dependable year-round performance. Not designed for use in harsh water regions, the 322MLV is backed by a 5-year tank warranty and capable of reducing hot water energy use by up to 70%.
Key Features / USPs:
- 320L tank – great for homes of up to 6 people
- L collector provides optimal solar gain
- Freeze-protected system for winter resilience
- Certified for high-altitude (up to 600m) installs
- Save on energy costs with up to 70% efficiency*
- 5-year Solahart warranty coverage
- Not suitable for harsh water areas^
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Specifications
Solar Storage Tank Storage Capacity (litres) 320 Boost Capacity (Electric) (litres) 170 Installation Indoor/Outdoor Solar Controller Kit PN 299293 Weight Empty (kg) 92 Weight Full (kg) 418 Height (m) 1.640 Width (m) 0.640 Depth (m) 0.680 Electric Boost Specifications Heating Unit Type Cooper sheath immersion element Supply Voltage 240V 50hz Collectors General Aperture (heating) Area (m2) 1.87 Length (mm) 1943 Width (mm) 1027 Height (mm) 83 Capacity (litres) 1.2 Working Pressure 1000 kPa L Collectors Weight Emtpy (kg) 33 Weight Full (kg) 34 Absorber Surface Black polyester powder coat Absorber Material aluminium Riser Material copper tube Tray Material 0.7mm aluminium Insulation Material - Base 38mm polyester blanket Glass 3.2mm tempered low iron glass Water Supply TPR Valve Setting 1000 kPa
145 psiECV* Setting 850 kPa
125 psiMax. Supply Pressure With ECV 680 kPa Max. Supply Pressure Without ECV 800 kPa Minimum Supply Pressure 200 kPa / 29 psi Water Connections Cold Rp 3/4 Water Connections Hot Rp 3/4 Water Connections Solar DN15 compression fittings (solar hot and solar cold inlets to tank RP¾/20 * The suggested price is comprised of RRP less the applicable solar incentive and excluding installation. Solar incentive value applies to 322MLV system in Zone 3.
^ Energy savings of up to 65% shown are based on Australian Government approved TRNSYS simulation modelling of a Solahart 322MLV and using a medium load in Zone 3 and apply when replacing an electric water heater. Any savings will vary depending upon your location, type of Solahart system installed, orientation and inclination of the solar collectors, type of water heater being replaced, hot water consumption and fuel tariff. Maximum financial savings off your hot water bill are achievable when replacing an electric water heater on continuous tariff.
† Solahart Warranty Details: 5/3/2 warranty; 5 year cylinder and collectors supply, 3 year parts, 2 year labour; applies 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. For further details, call 131 031. All other applications have a 3/1/1 warranty; 3 year cylinder and collector supply, 1 year parts supply, 1 year labour. -
How it works
How Split System Solar Water Heaters Work
With open circuit split systems the water is circulated from the tank at ground level through the solar collectors by an electric pump called a 'circulator'. As the sun heats the water in the solar collectors, the increase in temperature activates the circulator. The circulator switches on whenever the water in the solar collectors is hotter than the water in the solar storage tank. The circulator moves the hotter water from the solar collectors through the solar hot pipe to the solar storage tank and the cooler water from the solar storage tank is circulated to the solar collectors via the solar cold pipe to be heated by the sun’s energy. This process continues whilst solar energy is available and the water in the solar storage tank requires heating. The circulator will deactivate when the water temperature in the solar storage tank is around 70°C to 75°C.
The Solahart 322MLV split solar water heater is designed to be installed as an electric boosted solar water heater with its booster heating unit connected to a power supply, however it may be installed with an in-series continuous flow or storage booster. If installed with an in-series booster, then the electric booster heating unit will not be connected to a power supply.
Solar Operation
The operation of the circulator is controlled by the combination of:
- the hot sensor located at the outlet of the solar collectors. The hot sensor measures the water temperature at the outlet of the solar collectors.
- the cold sensor located at the solar cold outlet at the base of the solar storage tank. The cold sensor measures the water temperature at the bottom of the solar storage tank.
- the differential controller located in the solar control unit.
With open circuit split systems, the water is circulated from the tank at ground level through the solar collectors by an electric pump called a 'circulator'. As the sun heats the water in the solar collectors, the increase in temperature activates the circulator. The circulator switches on whenever the water in the solar collectors is hotter than the water in the solar storage tank. The circulator moves the hotter water from the solar collectors through the solar hot pipe to the solar storage tank and the cooler water from the solar storage tank is circulated to the solar collectors via the solar cold pipe to be heated by the sun’s energy.
This process continues whilst solar energy is available and the water in the solar storage tank requires heating. The circulator will deactivate when the water temperature in the solar storage tank is around 70°C to 75°C.
During normal operation if the amount of solar energy available reduces, such as when the sky becomes very cloudy or the sun becomes lower in the sky in the late afternoon, and the water no longer gains usable heat from the solar collectors, the circulator will deactivate. The water heater will then enter standby mode.
Over-Temperature Operation
The purpose of the Over-temperature operation is to reduce the amount of overheating or ‘stagnation’ of water in the solar collectors. When the water in the solar storage tank has reached 70°C to 75°C and the circulator has deactivated, the solar collectors will continue to gain heat while solar energy is still available.
If the water in the solar collectors stagnates and its temperature becomes very high, the circulator will activate for a short period to transfer this extra energy to the solar storage tank. The circulator will deactivate when the water temperature in the solar collectors decreases. This process will either repeat for a maximum of eight cycles or until the water temperature in the solar storage tank reaches around 75°C to 80°C or the hot sensor does not sense another increase in water temperature to a stagnation level after a cycle is completed, i.e. the solar energy available reduces.
Night Time Cooling Operation
The purpose of Night Time Cooling operation is to rid the solar storage tank of excess solar energy gained by Over-temperature operation during that day. The desired water temperature in the solar storage tank is to be between 60°C to 70°C.
If the solar control unit has entered Over-temperature operation during the day, then after the water temperature in the solar collectors reduces later in the day or early evening, the circulator will activate. Water from the solar storage tank will circulate through the solar collectors and excess heat in the water will radiate from the solar collectors reducing the temperature of the water. The water will circulate for a period of time and until the water temperature in the solar storage tank is around 60°C to 70°C. The water heater will then enter standby mode.
Freeze Protection Operation
The purpose of Freeze Protection operation is to prevent freezing of water in the solar collectors and solar pipe work in very cold conditions. The water in the solar collectors will cool during periods of no solar gain. In very cold conditions, such as overnight and very early in the morning before sunrise, the water temperature can approach freezing point.
If the hot sensor measures that the water temperature in the solar collectors is approaching freezing, the circulator will activate. Water from the solar storage tank, containing more energy than the water in the solar collectors, will circulate through the solar collectors keeping the water temperature above freezing point. The circulator will remain on for some minutes and until the hot sensor measures a water temperature at a safe level above freezing. When both of these conditions are met, the circulator will deactivate. The water heater will then enter standby mode.
Standby Mode
The water heater will be in Standby mode whenever conditions are not favourable for solar heating in Normal operation, and Over-temperature operation and Night Time Cooling are not required or have been completed, and conditions are not cold enough for or in-between Freeze Protection operation.
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