302LCSD Roof Top Solar: Key Attributes

Key Features

An open circuit solar hot water system has a collector circuit which is directly connected to the potable water in the solar storage tank. Potable water from the solar storage tank circulates through and collects heat gained by the solar collectors and then circulates back into the solar storage tank.

The 302LCSD Series has a ceramic lined tank with a protective anode. The 302LCSD Free Heat offers an extended warranty and features additional protection. The tank is equipped with an electric booster, alternatively an in-line gas booster is available. 

  •  Space saving roof mount design
  •  Reliable, low maintenance operation
  •  Energy Efficient – cuts energy use by up to 70%^
  •  Eligible for Government rebates and incentives


* The suggested price is comprised of RRP less the applicable solar incentive and excluding installation. Solar incentive value applies to 302LCSD system in Zone 3.

^ Energy savings of up to 70% shown is based on Australian Government approved TRNSYS simulation modelling of a Solahart 302LCSD 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: 5/5/5 warranty; 5 year cylinder and collectors supply, 5 year parts, 5 year labour. 10/5/5 warranty, 10 year cylinder and collectors supply, 5 year parts, 5 year labour.

302LCSD Solar Specifications

Model 300 tank 302 system
Tank Model    
LCSC Series 300L 300L
LCSC Free Heat 300LF 300LF
Storage Capacity 300 litres 300 litres
Boost Capacity 150 litres 150 litres
Weight Empty 91 kg 160 kg
Weight Full 391 kg 464 kg
A-Width* 2.43 m 2.48 m

* For servicing and safe access, a space equal to the tank length should be left on the water connection end of the system and 1m (40in) should be left on the three other sides of the installation.
**TRV OTP is mandatory on these models in Australia and New Zealand.

LCS Collector 
Aperture (Heating) Area 1.87 m2 
Length  1943 mm
Width 1027 mm
Height 83 mm
Capacity  1.9 litres
Empty 31 kg
Full 33 kg 
Working Pressure 1000
Absorber Surface Mirotherm sputtered selective surface
Absorber Material Aluminium
Riser Material Copper
Number of Risers 6
Tray Material 0.7mm aluminium
Insulation Material  
Base 38mm glasswool blanket
Sides Polyester blanket
Glass 3.2mm tempered low iron


Water Supply
TPR Valve Setting

1000 kPa

ECV* Setting 850 kPa
Max. Supply Pressure  
With ECV 680 kPa
Without ECV 800 kPa
Water Connections   
Cold  DN15 compression fitting
Hot  R 1/2

*Expansion Control Valve (ECV)

Electric Boost Specifications
Heating Unit Type Copper sheath immersion element
Supply Voltage 220 V - 250 V
Recovery Rate @ 240 V and Temperature Rise of:
1.8 7 51  38  31 
2.4 10  68  52  41 
3.6 15  103  77  62 


How Roof Top Solar Systems Work

Solar Operation

The 302LCSD solar system has its vitreous enamel lined solar storage tank installed on the roof directly coupled to the solar collectors. It works on the simple scientific fact that hot water rises. As the sun heats the water in the solar collectors, the increase in temperature causes the water to rise through an insulated copper pipe into the storage tank. This allows cooler water from the solar storage tank to flow into the solar collectors to be heated by the sun‟s energy. This process continues while solar energy is available.

Orientation of Solar Collectors

To help maximise system performance, solar collectors should be installed with an optimum orientation facing true north (in the southern hemisphere) or true south (in the northern hemisphere). Always check for true north or true south using a compass or other suitable device.

To help maximise system performance, solar collectors should be installed with an optimum inclination. This is equal to 90% to 100% of the local latitude angle when collectors are oriented within 60° of true north or true south, and between 10° and 20° if the collectors are oriented between 60° and 90° from the optimum orientation. Generally, improved summer performance is obtained from an angle of inclination less than the optimum angle and improved winter performance is obtained by an angle of inclination greater than the optimum angle. If the angle of inclination varies by 20° from the optimum angle, the solar collectors will receive about 10% less total annual solar radiation.

Frost/Freeze Protection

An Open Circuit system does not have freeze protection and is not suitable for installation in areas prone to freeze conditions. Freeze conditions occur below 5°C (41°F). This system has NO WARRANTY for freeze damage. In areas that are prone to frost / freezing, a Closed Circuit system should be used.

Solar Boosting

In-Tank Boosting

An isolating switch is installed in the electrical meter box for an electrically in-tank boosted model. This should be left switched on to allow the booster heating unit to operate if required. The booster heating unit is for heating the water at times of low solar energy gain, such as during very cloudy or rainy weather, or during the colder months. The booster heating unit will only activate if heating is required and power is available from the switchboard. When the water is below the thermostat setting, the booster heating unit will turn on and heat the water. The booster heating unit will automatically turn off when the temperature of the water reaches the thermostat setting. If the water temperature drops below the setting again the booster will re-activate.

In-Series Gas Boosting

An in-series gas booster (also known as a continuous flow gas booster) can be installed between the solar water heater and the hot outlets in the house. This booster should be permanently active. The booster senses the temperature of the water passing through it: if the water temperature is above its temperature setting it does nothing; if below it will automatically heat the water up to the preset outlet temperature setting. This gas booster ensures hot water delivery for a variety of hot water demands without the need for user intervention while enabling maximum solar energy contribution to the water heating. For more information on this booster, consult the owner’s manual for the product.

Over-Temperature Protection System

The 302LCSD Open Circuit Series system has a ‘TRV’ thermosiphon restrictor valve located between the cold inlet of the tank and the cold inlet of the collectors. This valve restricts the flow through the collectors when the tank has reached a sufficiently high temperature.



Why Solahart Solar Hot Water Systems: Download

Solahart 302LCSD Solar Hot Water System Brochure: Download

Solahart In-Line Gas Booster Brochure: Download

Installation Manuals

Solahart On-Roof Solar Hot Water System Owner's Guide and Installation Manual: Download

Solahart In-line Gas Booster Owner's Guide and Installation Manual: Download

Solar Incentive Forms

Small-scale Technology Certificate Assignment Form: Download