Home Forums General Discussion Energy Star Ratings of Washing Machines Reply To: Energy Star Ratings of Washing Machines


I guess if people are relying on a standard electric HWC, then it’s almost always going to be at least marginally more energy efficient to heat the water in the washing machine, rather than heating it in the cylinder and moving it through pipes to the machine. So in this case a single input machine is fine.

It may be cheaper to source the hot water from the cylinder if the cylinder is on a different meter than the washiing machine, eg. night rate or some other controlled rate on a separate meter.

If their hot water cylinder uses a heat pump, solar or wetback then potentially they can make savings if they have a hot water input.

Of course if they normally do cold washes, then none of this maters. If you’re comparing washing machine star ratings, then check the assumptions about whether the rating applies to hot, warm or cold washes, and ask the person whether they expect to do many warm or hot washes. Also check the machine default settings, many will do a warm wash if the temperature is not set manually each wash, so if the user expects to do mainly cold washes it may be worthwhile to find a machine that defaults to cold.

And finally, consider a front-loader. If they are going to be using a lot of hot washes, one way to save is just to use less heated water per wash. If you know how many litres of hot water is used/heated between different models, it will give you a better basis to choose between models and how much effort to put into getting a separate hot water feed.