Solahart 181L
A compact solar water heater ideal for smaller households in medium-to-high solar gain areas. Efficient, low-maintenance, and built to last.
181L Roof Top Solar: Key Attributes
The Solahart L Series is a roof mounted, open circuit solar water heater specifically designed to provide economical service in medium to high solar gain areas. It is not recommended for use in frost or poor water chemistry areas.
The L Series is ingenious in its simplicity. The black polyester powder coated aluminium absorber collects the sun's heat and transfers it to the water in the 7 risers. Copper is used for the risers for its high thermal conductivity ensuring the maximum amount of heat energy is passed to the water. As the water in the risers is heated, it rises into the tank to be replaced by cooler water from the tank. The solar heated water is then stored ready for use - hot water free from the sun.
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Optimal Performance
Most suitable for areas that receive medium to high levels of solar radiation and are not subject to frost conditionsCeramic Lined Tank
Corrosion protection for the water heater’s solar tank is obtained by using a proven, high quality vitreous enamel and a sacrificial anode.
Booster Options
The electric boosted models are equipped with an in-tank element. Alternatively the system can be installed as a pre-heater with an inline Solahart gas booster water heater.Environmental Incentives
There is an incentive resulting in a financial benefit to households that install solar hot water, under the Renewable Energy Target - a Federal Government legislated scheme. Your Solahart Expert can deduct the value of the financial benefit as an upfront discount off your system.-
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 * 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. -
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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