Hot water is the second largest portion of energy use in New Zealand homes, accounting for around 30% of the average energy bill, that's equivalent to $650 per year. So what's the best system for your home?

My general advice:

1. Do you need a new system? Obviously if you're building new, then you've got a great opportunity. Otherwise, if it's not broken, does it need fixing?
2. Two main types, storage vs continuous flow. Storage tends to be better for any more than two people in the house
3. Four main fuel types
1. Wood
2. Sun
3. Electricity
4. Gas
4. Larger homes or long thin homes may benefit from more than one system

Resource:

http://www.energywise.govt.nz/products-and-appliances/water-heating