Hydronic Heating Victoria
 
139

Before you look any further - have you considered a heat-pump alternative

Anyone who thinks GAS is a clean fuel should read this report and then look at a heatpump

If you are living "off-grid" then continue "shopping" below!

Evacuated tube solar hot water

These high efficiency systems uses the latest Technology Evacuated Tube Solar Collectors available, and are manufactured to Australian Standards AS/NZS 2712 and AS 3498.
Each solar collector module integrates 16 all-glass evacuated tubes, 16 U shaped copper heat absorbers, and 16 aluminum fins, into the solar collector frame.
The solar collector module is located separately from the Hot Water tank and the capacity of the tank is ‘sized’ to the number of solar collectors installed, and the expected water usage profiles.

There are many variables to consider before choosing the optimum system, it's a specialist job so please let us do that for you.

260Lt GAS system with 30 tube booster

GAS tank

 

Features and operational principle

The solar collector module is the most efficient, reliable and maintenance-free type of evacuated tube solar collector on the market today and does not require a high mounting angle of the solar collector frame (just greater than 5 degrees on a flat roof).
The selective coating inside the inner glass of the evacuated tubes ensures high energy absorption and a low heat radiance loss, which converts solar energy into heat energy. This heat energy is then transferred via the copper tubes and the aluminum fins to the solar collector manifold (There is over 48 metres of copper tube heat absorber in each module. The Water in the collector manifold is recirculated through the storage tank and back into the collector module(s).

Temperature sensors in the solar collectors on the roof and the water in the storage tank feed data into the controller. The controller starts the pump when it determines that there is sufficient differential temperature to heat the water in the tank, and stops it when the solar gain has been harvested.
When the solar gain has been insufficient to raise the tank water temp to at least 60oC, AND a tap is opened in the house, the system will operate its in-line heater to boost only the water going into the house to 60oC (This process is necessary to kill harmful bacteria in the water) The entire tank is not heated by the GAS system, only the water entering the house.

GAS/LPG systems When hot water is required, the hottest water is drawn from the top of the storage tank, another sensor determines if the water is above 60oC, if it is not it will operate the inline gas water heater.

Electric Systems The solar-electric system is cheaper to buy and install than the GAS model but not as efficient. It also works differently as it needs to heat all the water in the storage tank to 60oC at least once every 24hrs (usually at night on off-peak) to kill bacteria. It is commom practise to turn off the electric element "as it is not needed", and only turn it on when the water temperature delivered is considered too low. This practise is not recommended - the heater element is only ever activated when required and if it wasn't needed it would not operate. If you turn it off you open yourselves to bacterial infection - NEVER TURN THE ELEMENT OFF.


Split solar system features:

  • The higher heating efficiency is obtained by flowing the water the manifold, down and up each and every Tube, unlike other evacuated tube solar collectors.
  • Frost tolerant, certified down to Minus 25oC
  • over 3 metres of copper heat absorber in every tube !!
  • Marine Grade Stainless Steel tank. (ideal for solar storage tanks as water from the solar panels in summer can be above 90°C. The stainless steel will not break-down from the high heat, providing a much longer lifespan and therefore a better return on investment. Vitreous enamel (glass-lined) tanks will crack and rust out typically in 5 to 7 years - just as the warranty runs out!) We only recommend Stainless steel tanks for Solar:
  • The Gas heater provides continuous hot water, regardless of whether the tube boosters provide any solar gain.
  • Insulation properties of the vacuum in these solar evacuated tubes allow up to 97% of the heat from the sun to be retained. (12 sputted layer, tri-chlor coating.)
  • Each manifold and all copper U pipes are solidly constructed and welded as one completely sealed unit, and then pressure tested to 1,700 kpa (more than 3 times the maximum operating pressure).
  • Made to withstand high pressure mains water systems. No water directly inside the evacuated tubes. Can continue to operate even with broken tubes. (obviously with reduced performance)
  • Systems can be set up with ring mains for domestic or commercial applications.

Key Benefits of these LATEST TECHNOLOGY Solar Hot Water Systems

  • The storage tank can be located internally or externally.
  • The gas unit and storage tank are fitted at ground level, and only the solar booster collector tubes on the roof.
  • Smaller profile, lighter collectors than others means less weight on the roof, so no reinforcing of the roof structure is required.
  • No removable connections, so no possible leaks, and they are maintenance free.
  • In NSW for example, these units can save you up to 83% of your hot water heating costs.
  • Individual tubes can be replaced if required, at cost of approx $25 per tube (+ delivery & labour)

Models, Rebates & Pricing


RECs Rebate - ZONES

Fan

Overall installed cost of individual models will vary in accordance with, state, territory & zone rebates, existing conditions, delivery and installation costs.

Systems are available with 2 or 3 collector modules (each with 16 tubes), and either 264Lt or 327Lt stainless steel storage tank with Natural GAS heater (LPG and Electric systems are also available, however we do not recommend these systems as heatpump water heaters offer a superior alternative):

GAS/LPG models:

GAS/LPG units
Model Number

Tank Size

No. of
Tubes

Unit
Price
Before
Rebates

STC/RECs Rebate - ZONES

zone
   1

zone
   2

zone
   3

zone
   4

ET-250-G-32

250Lt

 32

$6004

 37x

 37x

 37x

 29x

ET-315-G-32

315Lt

$6169

ET-250-G-48

250Lt

 48

$7029

 45x

 44x

 45x

38x

ET-315-G-48

315Lt

$7139

Electric models:

<

Electric Units
Model Number

Tank
Size

No. of
Tubes

Unit
Price
Before
Rebates

RECs Rebates - ZONES

zone
  1

zone
  2

zone
  3

zone
  4

ET-250-E-32

250Lt

 32

$4409

30

30

30

25

ET-315-E-32

315Lt

$4807

29

29

29

24

ET-250-E-48

250Lt

 48

$5379

35

33

35

31

ET-315-E-48

315Lt

$5599

35

33

35

30

Prices do not include delivery and installation.
13th September 2013 - STC's currently trading at $37/REC
All rebate information is provided as a guide only - please call for confirmation - 1300 552 976

 


hit counter
Evacuated tube solar hot water - Victoria