A properly designed and installed solar water heating system can slash your power bill.

A solar water heating system can provide between 50 and 75 percent of your yearly hot water needs. It can be effective anywhere in New Zealand, even in less sunny areas. Over time, it can pay for itself through lower power bills. By using solar water heating, you'll also be helping to reduce New Zealand's greenhouse gas emissions.

In this guide, we explain what to look for, and how to use the system to get the best return in 'free' hot water.