Herald Sun: Choice spokesman Christopher Zinn said research showed a solar hot water system – which cost from $4000 to almost $10,000 – would take between four and six years to pay for itself. “Electric hot water systems are very inefficient and thirsty beasts when it comes to the power bills. “Solar hot water can substantially reduce household power consumption, but initial high outlays mean systems can take several years to pay for themselves,” Mr Zinn said. …