52D180 Hiline Solar: Key Attributes

Key Features

The 52D180 Hiline® is available with either in-tank electric or continuous flow gas boosting. Boosting is a back-up feature that provides hot water during poor weather periods. The electric boosted model will provide a boost volume of 90 litres. There is a larger model designed to suit a larger hot water load. The gas boosted model features an inline 6-star continuous flow gas booster, which only turns on to heat water when the water temperature flowing through it is less than 58°C.

  •  Space saving roof mount design
  •  Low maintenance
  •  Energy Efficient – cuts energy use by up to 60%^%
  •  Eligible for Government rebates and incentives


* The suggested price is comprised of RRP less the applicable solar incentive and excluding installation. Solar incentive value applies to 52D180/1NPT system in Zone 3.

^ Energy savings of up to 70% shown is based on Australian Government approved TRNSYS simulation modelling of a Rheem 52D180/1NPT 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.

† Warranty Details: 5/3/1 warranty; 5 year cylinder and collectors supply, 3 year parts, 1 year labour.

52D180 Specifications


Model 52D180-1NPT 52D180/1NPT-G
Storage Capacity 180 Litres  180 Litres 
Solar Collectors  NPT200 NPT200 
Booster Type Electric Gas - Remote
Booster Capacity 90 litres 20L/min
People Per Household 1-2 1-3
Dimensions & Specifications    
Height (A) 510 mm 510 mm
Width (B) 1595 mm 1595 mm
Depth (C) 2480 mm 2480 mm
Collector Depth (D) 1943 mm 1943 mm
Collector Width (E) 1027 mm 1027 mm
Collector Height (F) 83 mm 83 mm
Weight Empty - Tank 61 kg 61 kg
Weight Full - Tank 241 kg 241 kg
Weight Empty - Solar Collectors 36 kg 36 kg
Weight Full - Solar Collectors 42 kg 42 kg


Electric Boost Specifications
Heating Unit Type Copper sheath immersion element
Supply Voltage 220 V - 250 V
Recovery Rate @ 240 V and Temperature Rise of:
2.4 10  68  52  41 
3.6 15  103  77  62 

How the Roof Top Solar Systems Work

Model Type 

The solar Hiline™ water heater is designed for both the solar collectors and the solar storage tank to be roof mounted. The solar storage tank has a Colorbond jacket and is suitable for installation with the NPT200 solar collectors.

The system does not have freeze protection. The system is not suitable for installation in areas subject to frost or 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.

This water heater is designed to be installed as an electric boosted solar water heater with its booster heating unit connected to a power supply, however it may be installed with an in-series continuous flow or storage booster. If this water heater is installed with an in-series booster, then the electric booster heating unit will not be connected to a power supply.

Solar Operation

The solar Hiline 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 a 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 and until the water in the solar storage tank reaches a temperature of approximately 75°C.

Automatic safety controls are fitted to the water heater to provide safe and efficient operation.

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.


Why Solahart Solar Hot Water Systems: Download

Solar 52D180 Hot Water System Brochure: Download

Solahart In-Line Gas Booster Brochure: Download

Installation Manuals

On-Roof Solar Hot Water System Owner's Guide and Installation Manual: Download

In-line Gas Booster Owner's Guide and Installation Manual: Download

Solar Incentive Forms

Small-scale Technology Certificate Assignment Form: Download