300lt Roof Top Solar System
Solahart’s roof mounted tank systems save space at ground level and their elegant simplicity make them efficient and reliable. The Solahart 302J solar water heater is specifically designed to provide economical service in medium to high solar gain areas, and is suitable for frost prone or harsh water chemistry areas.
302SP Roof Top Solar: Key Attributes
In medium and high solar gain
Suitable for frost prone
Gas or electric boost options are
Replace energy hungry water heater
The Solahart J Series is a roof mounted, closed circuit solar water heater specifically designed to provide economical service in medium to high solar gain areas. It is recommended for use in frost or poor water chemistry areas.
The J Series features Solahart’s revolutionary multi-flow collector to extract the maximum amount of energy from the sun. This is used to heat the Hartgard fluid in the collector which rises into the heat exchanger where the heat is transferred to the water inside of the tank. The ceramic lined tank has a protective anode and the SP Free Heat series features additional protection.
- Space saving roof mount design
- Reliable, low maintenance operation
- Energy Efficient – cuts water heating energy use by up to 89%^
- Reduces household greenhouse emisions
302J Solar Specifications
|Thermosiphon J Closed Circuit Systems|
|Tank Model||J – 300J|
|Storage Capacity||Free Heat – 300F|
|Boost Capacity||300 litres|
|Weight Empty Tank Only||150 litres|
|Weight Full Tank Only||407 kg|
|A-Width* Tank Only||2.43 kg|
|Weight Empty System||202 kg|
|Weight Full System||521 kg|
|A-Width* System||2.43 m|
* For safe access and servicing, 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. ‡HartStat OTP is optional on these models in Australia and New Zealand. Systems (if installed with a HartStat OTP system) can be installed as a solar preheater with an inline Solahart gas booster water heater. Refer to the Solahart gas booster specification sheet for further details on the gas booster.
|Aperture Area||1.8 m2|
|Weight Empty||45 kg|
|Weight Full||49 kg|
|No OTP||80 kPa|
|With OTP||170 kPa|
|Absorber Surface||Black polyester powder coat|
|Number of Risers||35|
|Insulation Material (Base)||38 mm glass wool blanket|
|Glass||3.2 mm tempered low iron|
|TPR Valve Setting||1000 kPa|
|ECV* Setting||850 kPa|
|Maximum Supply Pressure|
|With ECV||680 kPa|
|Without ECV||800 kPa|
*Expansion Control Valve.
|Electric Boost Specifications|
|Heating Unit Type||Copper sheath immersion element|
|Supply Voltage||220 V – 250 V|
|Recovery Rate @ 240 V and Temperature Rise Of:|
How Roof Top Solar Systems Work
Orientation of Solar Collectors
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.
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.