Solahart 181SP
The Solahart 181SP provides a compact, high-performance solar water heating system, ideal for small households. Featuring closed-circuit thermosiphon technology, it ensures reliability and protection against corrosion in harsh water conditions.
Solahart 181SP Solar Water Heater: Key Attributes
Why the 181SP system is a smart choice
The Solahart 181SP is designed for smaller households of 1-2 people, providing a reliable solar hot water solution with a 180-Litre tank. It uses closed-circuit thermosiphon technology, offering enhanced protection against corrosion, especially in areas with harsh water conditions. The system includes a TRV valve for safe pressure relief and Super Shield Enamel® for added durability. With high efficiency and low maintenance, the SP Free Heat Series helps you reduce energy costs while providing eco-friendly hot water year-round.
Key Features:
- Capacity: 180-Litre tank, ideal for small households (1-2 people).
- Closed Circuit Thermosiphon: Efficient solar heating with corrosion protection.
- TRV Valve: Safe pressure relief during operation.
- Super Shield Enamel: Enhanced corrosion resistance for extended lifespan.
- Energy Efficient: Save up to 65% on water heating costs.#
- Reduced CO2 Emissions: Save up to 2.3 tonnes of CO2 annually.
Warranty:
- 10-year warranty on the collector and tank.
- 5-year warranty on parts and labour.
Collectors:
- 1 x SP Collector - provides efficient performance in medium to high solar gain areas.
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Solahart 181L
Solahart L Free Heat Series - 181L open-circuit roof-mounted solar water heater. -
Solahart 181SP
Compact, efficient solar hot water solution with superior corrosion protection.
How Roof Top Solar Systems Work – Solar Operation
The 181SP solar system has its vitreous enamel lined solar storage tank installed on the roof directly coupled to the solar collectors. In the Closed Circuit Series, heat is absorbed by the collector and passed to the ‘Hartgard’ heat transfer liquid inside the collector. As the temperature of the ‘Hartgard’ increases, the hot fluid rises up through the collector by the Natural Thermosiphon Principle, into the heat exchanger jacket around the potable water storage tank. Here, the heat is transferred to the potable water, cooling the ‘Hartgard’ fluid. The cooler fluid is then forced back down into the collectors through the displacement action of further hot fluid rising up into the heat exchanger jacket.
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
Solahart Closed Circuit Systems are protected against freezing or harsh water conditions by our exclusive ‘Hartgard’ fluid. ‘Hartgard’ is a blue, non-toxic, propylene glycol fluid which, when mixed with water, provides the Heat Transfer Fluid contained in the solar collectors and the heat exchanger jacket around the tank. ‘Hartgard’ is used to lower the freezing temperature of the Heat Transfer Fluid and so provides protection against freezing (Note: for the correct % of Hartgard in the Heat Transfer Fluid, refer to the section on Frost / Freeze Protection). ‘Hartgard’ is a special food grade solution and is the only solution permitted to be used in the closed circuit systems. Hartgard has been approved by the National Health and Medical Research Council of Australia.
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 Closed Circuit Series solar water heaters have a means of controlling the maximum temperature of the water in the storage tank. These systems may be installed with a ‘HartStat’ valve located between the hot outlet of the collectors and the inlet to the tank heat exchanger. This valve closes when the tank has reached a sufficiently high temperature, thereby preventing further heat transfer to the tank, and thus limiting its temperature.
Solahart 302L
The Solahart 302L is designed for medium-sized households. It combines efficient solar water heating with advanced features like the TRV valve and Super Shield Enamel® for long-lasting protection.
Solahart 302L Solar Water Heater: Key Attributes
Why the 302L system is a smart choice
The Solahart 302L is ideal for medium-sized households with 3-4 people, providing a balanced combination of high capacity and energy efficiency. The 300-Litre tank ensures there is enough hot water for daily needs, and its open-circuit thermosiphon system provides reliable performance with minimal maintenance. The system includes a TRV valve for safe operation and Super Shield Enamel® for maximum protection against corrosion, ensuring it lasts for years to come. The L Free Heat Series offers an environmentally-friendly solution with significant energy savings.
Key Features:
- Capacity: 300-Litre tank, ideal for medium households (3-4 people).
- Open Circuit Thermosiphon: Reliable solar-powered water heating with minimal maintenance.
- TRV Valve: Safe pressure management for optimal performance.
- Super Shield Enamel: Enhanced durability with corrosion protection.
- Energy Efficient: Save up to 65% on water heating costs.#
- Reduced CO2 Emissions: Save up to 2.3 tonnes of CO2 annually.#
Warranty:
- 10-year warranty on the collector and tank.*
- 5-year warranty on parts and labour.*
Collectors:
- 2 x L Collectors - Optimal Performance in medium-to-high solar gain areas.
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Solahart 181CS13C
Compact, reliable solar hot water solution with enhanced corrosion protection for smaller households. -
Solahart 181L
Solahart L Free Heat Series - 181L open-circuit roof-mounted solar water heater. -
Solahart 181SP
Compact, efficient solar hot water solution with superior corrosion protection.
How Roof Top Solar Systems Work Solar Operation
The 302L 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. Copper is used for the risers for its high thermal conductivity ensuring the maximum amount of heat energy is passed to the water. 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.
The L Series has a ceramic lined tank with a protective sacrificial anode. The L Free Heat features additional anode protection. L and L Free Heat systems can be installed with an optional TRV over temperature protection system to prevent over performance during periods of higher solar radiation and lower hot water draw off.
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 device 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 Open Circuit Series systems may be installed with a ‘TRV’ thermosiphon restrictor 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.
Solahart 181L
The Solahart 181L is a compact, reliable solar water heating solution for small households. It features open-circuit thermosiphon technology, ensuring efficient water heating with minimal maintenance.
Solahart 181L Solar Water Heater: Key Attributes
Why the 181L system is a smart choice
The Solahart 181L is the perfect solar water heating solution for smaller households or properties with lower hot water demand. With a 180-Litre capacity, this system is ideal for 1-2 people. Utilising open-circuit thermosiphon technology, it captures solar energy with minimal maintenance. The system is designed for durability, with a TRV valve to manage pressure safely and Super Shield Enamel® to protect the tank from corrosion. The L Free Heat Series ensures long-term reliability and substantial energy savings.
Key Features:
- Capacity: 180-Litre tank, ideal for small households (1-2 people).
- Open Circuit Thermosiphon: Efficient solar-powered heating with low maintenance.
- TRV Valve: Provides safe pressure relief to ensure smooth operation.
- Super Shield Enamel: Protection against corrosion for increased durability.
- Energy Efficient: Save up to 65% on your water heating costs.#
- Reduced CO2 Emissions: Save up to 2.3 tonnes of CO2 annually.#
Warranty:
- 10-year warranty on the collector and tank.*
- 5-year warranty on parts and labour.*
Collectors:
- 1 x L Collector - Optimal Performance in medium-to-high solar gain areas.
Explore more Roof Top Solar
Explore more-
Solahart 181CS13C
Compact, reliable solar hot water solution with enhanced corrosion protection for smaller households. -
Solahart 181L
Solahart L Free Heat Series - 181L open-circuit roof-mounted solar water heater. -
Solahart 181SP
Compact, efficient solar hot water solution with superior corrosion protection.
How Roof Top Solar Systems Work - Solar Operation
The 181L 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.
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 Open Circuit Series systems may be installed with a ‘TRV’ 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.
* The suggested price is comprised of RRP less the applicable solar incentive and excluding installation. Solar incentive value applies to 181L system in Zone 3.
^ Energy savings of up to 60% shown is based on Australian Government approved TRNSYS simulation modelling of a Solahart 181L and using a small 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.
A-Width*, B-Length*: 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. The L system (if installed with a TRV system) can be installed as a solar preheater with a Solahart inline gas booster water heater. Refer to the Solahart gas booster specification sheet for further details on the gas booster.
Weight*: Weight includes fittings
ECV*: Expansion Control Valve.
