Request a Free Quote Request Now

Thermosiphon Roof Mount System

All Solahart solar hot water systems, where the tank is roof-mounted, use the Thermosiphon principle to collect heat from the sun and transfer it to your hot water. The Thermosiphon principle is based on two naturally occurring phenomena:

  • Dark objects absorb heat
  • Hot water rises

Solahart solar collectors are coated with a dark, heat-absorbent surface. This coating absorbs the energy from the suns rays and heats the fluid in the collectors. As the fluid heats, it rises to the top of the collectors and into the tank where it displaces cooler fluid which flows in to the bottom of the collectors where the process is repeated.

The greater the temperature difference between the fluid in the solar collectors and the water in the tank the faster the flow between them.

In open circuit systems the fluid in the collectors is water while in closed circuit systems a special antifreeze fluid, called Hartgard, is used.
When heated in the solar collectors, the Hartgard is circulated in a jacket around the tank to transfer the heat to the water inside. Closed circuit systems are recommended for frost prone areas or in situations with poor water chemistry.

In this way Solahart solar water heaters constantly soak up the sun’s energy to maximise your energy savings.

With a Solahart thermosiphon solar hot water heating system you can choose from a range of boosters including in-tank electric or in-line gas boosters to ensure you always have hot water on tap even on cloudy days.

To find out which Solahart solar water heater is best for you check out our system selector or contact your nearest Solahart Expert for your FREE solar home assessment.

  • Whats the best time to call you?
  • This field is for validation purposes and should be left unchanged.
solahart solar hot water heater service installation 13
solahart solar hot water heater service installation 15
solahart solar hot water heater service installation 16

J Series Thermosiphon Solar Hot Water

Features of the J Series Thermosiphon

  • Optimum performance in medium and high solar gain areas
  • Suitable for frost prone or harsh water areas
  • Stylish slimline design
  • Thermosiphon operation minimises maintenance
  • Gas or electric booster models available
  • Double coated ceramic lined tank
  • Enhanced protection on Free Heat model

The J Series black polyester powder coated absorber maximises the transfer of available solar energy while the closed circuit design makes it suitable for frost prone and poor water chemistry areas.

The J series utilises Solahart’s revolutionary multi-flow collector which uses a huge 35 risers to extract the maximum amount of energy from the sun which heats the Hartgard fluid in the collector. This Hartgard rises into the heat exchanger where the heat is transferred to the water inside of the tank.

The system has a double ceramic lined tank and a protective sacrificial anode and the J Free Heat features additional protection. The tank is equipped with an electric booster, alternatively an in-line gas booster is available.

Most J and J Free Heat systems can be installed with the optional HartStat OTP (over temperature protection) system to minimise over performance during periods of higher solar radiation and lower hot water draw off.

Benefits of the J Series Thermosiphon

  • Can save up to 50% to 85% of water heating energy consumption*
  • Reliable, low maintenance operation
  • Hot water regardless of the weather
  • Can qualify for valuable government environmental incentives*
  • Reduced energy use can save up to 1.7 to 3.1 tonnes of CO2 emissions per annum*
  • Peace of mind with 10/5/5† (J Free Heat), 5/5/5† (J Series) year warranties
  • Free Heat series available in 300 litre capacity

*Energy savings of up to 50% to 85% shown are based on Australian Government approved TRNSYS simulation modelling using a medium load. Savings and incentives 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.

†Warranty Details: 10/5/5 – 10 year cylinder and collectors supply, 5 year parts, 5 year labour; 5/5/5 – 5 year cylinder and collectors supply, 5 year parts, 5 year labour.

Specifications and Technical Details of the J Series Thermosiphon

Tank Model 150 180 220 300 440
Tank Capacity (litres) 150 180 220 300 440
Collectors (number) 1 1 2 2 3 3
Boost Capacity (litres) 75 90 110 150 150 220
Weight – Empty (kg) 102 108 170 187 229 290
Weight – Full (kg) 256 292 394 495 541 730
Width (m)* 1.40 1.62 2.42 2.43 3.38 3.49
Length (m)* 2.63 2.63 2.63 2.63 2.63 2.63

* A distance equal to the tank length should be left on the water connections side of the system plus 1.0m should be left on the other three sides of the installation for safe access and servicing.

The J and J Free Heat systems (if installed with a HartStat OTP system) can be installed as a solar preheater with an inline Solahart gas booster water heater.

Request a quote for solar hot water installation

Complete the form below and one of our trained Solar Experts will be in touch shortly to discuss your requirements and quote.

  • Drop files here or
    Accepted file types: jpg, jpeg, png.
  • This field is for validation purposes and should be left unchanged.

SP Series Thermosiphon Solar Hot Water

Features of the SP Series Thermosiphon

  • Optimum performance in medium and high solar gain areas
  • Suitable for frost prone or harsh water areas
  • Stylish slimline design
  • Thermosiphon operation minimises maintenance
  • Gas or electric booster models available
  • Double coated ceramic lined tank
  • Enhanced protection on Free Heat model
  • Option of over temperature protection

The SP series features the Australian designed and manufacured Envelope solar collector, offering the latest in styling and all weather durability, and with five patents pending has been designed to meet or exceed Australian and International Standards in areas of strength and durability. The SP Series black polyester powder coated absorber maximises the transfer of available solar energy while the closed circuit design makes it suitable for frost prone and poor water chemistry areas.

The SP series utilises Solahart’s revolutionary multi-flow collector which uses a huge 35 risers to extract the maximum amount of energy from the sun which heats the Hartgard fluid in the collector. This Hartgard rises into the heat exchanger where the heat is transferred to the water inside of the tank.

The system has a double ceramic lined tank and a protective sacrificial anode and the SP Free Heat features additional protection. The tank is equipped with an electric booster, alternatively an in-line gas booster is available.

SP and SP Free Heat systems can be installed with the optional HartStat OTP (over temperature protection) system to minimise over performance during periods of higher solar radiation and lower hot water draw off.

Benefits of the SP Series Thermosiphon

  • Can save up to 50% to 85% of water heating energy consumption*
  • Reliable, low maintenance operation
  • Hot water regardless of the weather
  • Can qualify for valuable government environmental incentives*
  • Reduced energy use can save up to 1.7 to 3.1 tonnes of CO2 emissions per annum*
  • Peace of mind with 10/5/5† (SP Free Heat), 5/5/5† (SP Series) year warranties
  • Free Heat series available in 300 litre capacity

*Energy savings of up to 50% to 85% shown are based on Australian Government approved TRNSYS simulation modelling using a medium load. Savings and incentives 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.

†Warranty Details: 10/5/5 – 10 year cylinder and collectors supply, 5 year parts, 5 year labour; 5/5/5 – 5 year cylinder and collectors supply, 5 year parts, 5 year labour.

Specifications and Technical Details of the SP Series Thermosiphon

Tank Model 180 220 300 440
Tank Capacity (litres) 180 220 300 440
Collectors (number) 1 2 2 3 3
Boost Capacity (litres) 90 110 150 150 220
Weight – Empty (kg) 117 180 197 244 305
Weight – Full (kg) 310 419 515 567 775
Width (m)* 1.62 2.42 2.43 3.38 3.49
Length (m)* 2.63 2.63 2.63 2.63 2.63

* A distance equal to the tank length should be left on the water connections side of the system plus 1.0m should be left on the other three sides of the installation for safe access and servicing.

The SP and SSP Free Heat systems (if installed with a HartStat OTP system) can be installed as a solar preheater with an inline Solahart gas booster water heater.

Request a quote for solar hot water installation

Complete the form below and one of our trained Solar Experts will be in touch shortly to discuss your requirements and quote.

  • Drop files here or
    Accepted file types: jpg, jpeg, png.
  • This field is for validation purposes and should be left unchanged.

L Series Thermosiphon Solar Hot Water

Features of the L Series Thermosiphon

  • Stylish slimline design
  • Thermosiphon operation minimises maintenance
  • Gas or electric booster models available
  • Double coated ceramic lined tank
  • Enhanced protection on Free Heat model
  • TRV over temperature protection available

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.

The L Series has a double coated ceramic lined tank with a protective anode. The L 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.

L and L Free Heat systems can be installed with an optional TRV over temperature protection system to minimise over performance during peridos of higher solar radiation and lower hot water draw off.

Benefits of the L Series Thermosiphon

  • Can save up to 50% to 85% of water heating energy consumption*
  • Reliable, low maintenance operation
  • Hot water regardless of the weather
  • Can qualify for valuable government environmental incentives*
  • Reduced energy use can save up to 1.9 to 3.0 tonnes of CO2 emissions per annum*
  • Peace of mind with 10/5/5† (L Free Heat) and 5/5/5† (L Series) year warranties
  • Free Heat series available in 180 and 300 litre capacities

*Energy savings of up to 50% to 85% shown are based on Australian Government approved TRNSYS simulation modelling using a medium load.  Savings and incentives 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.

†Warranty Details: 10/5/5 – 10 year cylinder and collectors supply, 5 year parts, 5 year labour; 5/5/5 – 5 year cylinder and collectors supply, 5 year parts, 5 year labour.

Specifications and Technical Details of the L Series Thermosiphon

Tank Model 150 180 220 300 440
Tank Capacity (litres) 150 180 220 300 440
Collectors (number) 1 1 2 2 3 3 4
Boost Capacity (litres) 75 90 110 150 150 220 220
Weight – Empty (kg) 86 92 138 151 184 250 260
Weight – Full (kg) 239 275 364 457 493 676 712
Width (m)* 1.45 1.67 2.20 2.48 3.37 3.49 4.44
Length (m)* 2.53 2.53 2.53 2.53 2.53 2.53 2.53

* A distance equal to the tank length should be left on the water connections side of the system plus 1.0m should be left on the other three sides of the installation for safe access and servicing.

The L and L Free Heat systems (if installed with a TRV over temperature protection system) can be installed as a solar preheater with an inline Solahart gas booster water heater.

Request a quote for solar hot water installation

Complete the form below and one of our trained Solar Experts will be in touch shortly to discuss your requirements and quote.

  • Drop files here or
    Accepted file types: jpg, jpeg, png.
  • This field is for validation purposes and should be left unchanged.

SC Series Thermosiphon Solar Hot Water

Features of the SC Series Thermosiphon

  • Highly efficient Black Chrome Selective Surface collector for optimum heat absorption
  • Multi-flow closed circuit operation makes it suitable for frost prone or harsh water areas
  • Stylish slimline design
  • Thermosiphon operation minimises maintenance
  • Gas or electric booster models available
  • Double coated ceramic lined tank
  • Enhanced protection on Free Heat model
  • Over Temperature Protection as standard (for Australian market)

The Solahart SC Series is a roof mounted, closed circuit solar water heater specifically designed to provide higher efficiency for use in low to medium solar gain areas.

The SC series features the Australian designed and manufactured Envelope solar collector, offering the latest in styling and all weather durability, and with five patents pending has been designed to meet or exceed Australian and International Standards in areas of strength and durability. The SC collector’s higher efficiency absorber with its Chrome Black Selective Surface maximises the absorption of available solar energy while the closed circuit design makes it suitable for frost prone or poor water chemistry areas.

The SC Series features Solahart’s revolutionary multi-flow collector which uses a huge 35 risers 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 double ceramic lined tank has a protective anode and the SC Free Heat series features additional protection. The tank is equipped with an electric booster, alternatively an in-line gas booster is available.

SC and SC Free Heat systems are installed with the HartStat OTP (over temperature protection) system to minimise over performance during periods of higher solar radiation and lower hot water draw off.

Benefits of the SC Series Thermosiphon

  • Can save up to 55% to 90% of water heating energy consumption*
  • Reliable, low maintenance operation
  • Hot water regardless of the weather
  • Can qualify for valuable government environmental incentives*
  • Reduced energy use can save up to 2.0 to 3.6 tonnes of CO2 emissions per annum*
  • Peace of mind with 10/5/5† (KF Free Heat) and 5/5/5† (KF Series) year warranties
  • Free Heat series available in 300 litre capacity

*Energy savings of up to 55% to 90% shown are based on Australian Government approved TRNSYS simulation modelling using a medium load. Savings and incentives 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.

†Warranty Details: 10/5/5 – 10 year cylinder and collectors supply, 5 year parts, 5 year labour; 5/5/5 – 5 year cylinder and collectors, 5 year parts, 5 year labour.

Specifications and Technical Details of the SC Series Thermosiphon

Tank Model 180 220 300 440
Tank Capacity (litres) 180 220 300 440
Collectors (number) 1 2 2 3 3
Boost Capacity (litres) 90 110 150 150 220
Weight – Empty (kg) 117 180 197 244 305
Weight – Full (kg) 310 419 516 567 775
Width (m)* 1.62 2.42 2.43 3.38 3.49
Length (m)* 2.63 2.63 2.63 2.63 2.63

* A distance equal to the tank length should be left on the water connections side of the system plus 1.0m should be left on the other three sides of the installation for safe access and servicing.

The SC and SC Free Heat systems (if installed with a HartStat OTP system) can be installed as a solar preheater with an inline Solahart gas booster water heater.

Request a quote for solar hot water installation

Complete the form below and one of our trained Solar Experts will be in touch shortly to discuss your requirements and quote.

  • Drop files here or
    Accepted file types: jpg, jpeg, png.
  • This field is for validation purposes and should be left unchanged.

KF Series Thermosiphon Solar Hot Water

Features of the KF Series Thermosiphon

  • Highly efficient Black Chrome Selective Surface collector for optimum heat absorption
  • Multi-flow closed circuit operation makes it suitable for frost prone or harsh water areas
  • Stylish slimline design
  • Thermosiphon operation minimises maintenance
  • Gas or electric booster models available
  • Double coated ceramic lined tank
  • Enhanced protection on Free Heat model

The Solahart KF Series is a roof mounted, closed circuit solar water heater specifically designed to provide higher efficiency for use in low to medium solar gain areas.

The higher efficiency absorber with its Chrome Black Selective Surface maximises the absorption of available solar energy while the closed circuit design makes it suitable for frost prone or poor water chemistry areas.

The KF Series features Solahart’s revolutionary multi-flow collector which uses a huge 35 risers 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 double ceramic lined tank has a protective anode and the KF Free Heat series features additional protection. The tank is equipped with an electric booster, alternatively an in-line gas booster is available.

KF and KF Free Heat systems are installed with the HartStat OTP (over temperature protection) system to minimise over performance during periods of higher solar radiation and lower hot water draw off.

Benefits of the KF Series Thermosiphon

  • Can save up to 55% to 90% of water heating energy consumption*
  • Reliable, low maintenance operation
  • Hot water regardless of the weather
  • Can qualify for valuable government environmental incentives*
  • Reduced energy use can save up to 2.0 to 3.6 tonnes of CO2 emissions per annum*
  • Peace of mind with 10/5/5† (KF Free Heat) and 5/5/5† (KF Series) year warranties
  • Free Heat series available in 300 litre capacity

*Energy savings of up to 55% to 90% shown are based on Australian Government approved TRNSYS simulation modelling using a medium load. Savings and incentives 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.

†Warranty Details: 10/5/5 – 10 year cylinder and collectors supply, 5 year parts, 5 year labour; 5/5/5 – 5 year cylinder and collectors, 5 year parts, 5 year labour.

Specifications and Technical Details of the KF Series Thermosiphon

Tank Model 150 180 220 300 440
Tank Capacity (litres) 150 180 220 300 440
Collectors (number) 1 1 2 2 3 3
Boost Capacity (litres) 75 90 110 150 150 220
Weight – Empty (kg) 102 108 170 187 229 290
Weight – Full (kg) 256 292 394 495 541 730
Width (m)* 1.40 1.62 2.42 2.43 3.38 3.49
Length (m)* 2.63 2.63 2.63 2.63 2.63 2.63

* A distance equal to the tank length should be left on the water connections side of the system plus 1.0m should be left on the other three sides of the installation for safe access and servicing.

The KF and KF Free Heat systems (if installed with a HartStat OTP system) can be installed as a solar preheater with an inline Solahart gas booster water heater.

Request a quote for solar hot water installation

Complete the form below and one of our trained Solar Experts will be in touch shortly to discuss your requirements and quote.

  • Drop files here or
    Accepted file types: jpg, jpeg, png.
  • This field is for validation purposes and should be left unchanged.

Examples of Solahart Thermosiphon hot water systems installed

solahart solar hot water heater service installation 09
solahart solar hot water heater service installation 07
solahart solar hot water heater service installation 01