SOLAR HOT WATER – INTRODUCTION
FOR MOST HOUSEHOLDS WATER HEATING REPRESENTS 30-45% OF THE ENERGY BILL.
THE MORE WATER YOU USE THE MORE YOU SAVE.
SIZING TIPS
New Zealand Standard NZS4234:2008 for energy efficiency defines three hot water loads:
| LOAD | # OF PEOPLE | USAGE @60’C | TANK SIZE | PANELS SIZE | ENERGY STAR SAVING |
| Small | 1to 3 | 120 litre per day | Up to 180 litre | 2 m² – 4 m² | 1,800 kWh |
| Medium | 3 to 5 | 180 litre per day | 180 to 300 litre | 3 m² – 6 m² | 2,800 kWh |
| Large | 5 to 9 | 270 litre per day | 300 to 500 litre | 5 m² – 8 m² | 3,800 kWh |
*Energy Star Means at least 70% of the energy comes from solar & at least a 10-year panels warranty
BIO SAFE & LEGIONELLA CONTROL
Follow the guidance of G12/AS2 (p48).
All the solar controllers in this catalogue are equipped with the required bio safe function.
INSTALLATION GUIDANCE
For Acceptable solution refer to G12/AS2: 2007 and the guidance of NZS3500.4
Before installing a solar system, ensure that it carries a current NZS2712:2007 certification.
This catalogue endorses the products of Solar Group Limited.
All the products in this catalogue are constructed in accordance to AS/NZS2712:2007 and been tested to AS/NZS4234:2008 energy performance.
TYPES OF SOLAR SYSTEMS:
Closed Loop Heating medium is not the potable water (typically food graded propylene glycol).
Open Loop Heating medium is the potable water which are circulating via the solar panels.
Thermosiphon Natural heat circulation between the panels and the elevated tank.
Pumped The heating process is done using a pump controlled by a solar controller.
Drain Back A pumped system where the heating medium drains back to tank when not circulating.
TYPES OF SOLAR PANELS
This manual endorses flat plate panels and evacuated tubes as the two most recommended types. See our Types of Solar Collectors flyer for details.
Indicative running costs of water heating options (3 person household)
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