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.
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Specifications
Tank Model - 180L Tank Storage Capacity (litres) 180 Boost Capacity (Electric) (litres) 90 Weight Empty (kilograms) 62 Weight Full (kilograms) 242 A-Width* (metre) 1.62 B-Length* (m) 0.51 Tank Model - 181L System Storage Capacity (litres) 180 Boost Capacity (Electric) (litres) 90 Weight Empty (kg) 97 Weight Full (297) 297 A-Width* (m) 1.67 B-Length* (m) 2.53 L Collectors Aperture (heating) Area (m2) 1.87 Length (mm) 1943 Width (mm) 1027 Height (mm) 83 Capacity (litres) 1.2 Weight Emtpy (kg) 29 Weight Full (kg) 32 Working Pressure 1000 kPa
145 psiAbsorber Surface Black polyester powder coat Absorber Material aluminium Riser Material copper tube Tray Material 0.7 mm aluminium Insulation Material - Base 38 mm polyester blanket Glass 3.2 mm tempered low iron glass Electric Boost Specifications Electric Boost Specifications Heating Unit Type Cooper sheath immersion element Supply Voltage 240 V -250 V Water Supply TPR Valve Setting 1000 kPa
145 psiECV* Setting 850 kPa
125 psiMax. Supply Pressure With ECV ( kPa) 680 Max. Supply Pressure Without ECV (kPa) 800 Water Connections Cold DN15 compression nut fitting (RP 3/4 tank fitting) Water Connections Hot R 1/2 -
How it works
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.
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