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Re: dishwashers

PostPosted: Mon Jan 31, 2011 6:00 pm
by Tracker
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Some interesting findings indeed !

Don't forget - To those who read these findings and think that it might apply to them also.......
The situation is that folk are talking about SOLAR-Hot-Water... FREE Hot Water.

The valid argument is that by using HOT water, the washing time is reduced, and hence there is considerably less electricity used. TRUE

If, however you have to pay to heat the water, then the reverse situation exists. Most all dish washers rely on using COLD water for initial rinses, and then gradually heat the water to a set temperature.

To use Electrically-Heated water for all washes, might reduce the wash time, but will likelky cost more in total energy consumption and hence the $$$ ..
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Re: dishwashers

PostPosted: Sat Feb 19, 2011 9:31 pm
by Smurf1976
Tracker wrote:If, however you have to pay to heat the water, then the reverse situation exists. Most all dish washers rely on using COLD water for initial rinses, and then gradually heat the water to a set temperature.

To use Electrically-Heated water for all washes, might reduce the wash time, but will likelky cost more in total energy consumption and hence the $$$ ..

Agreed though it does depend on how you are actually heating the water, and how long the pipe run from the water heater to the dishwasher are.

In my case it's a heat pump HWS on off-peak tariff sitting almost straight under the dishwasher. That's about a 6:1 cost ratio (two thirds reduction in energy use, and the power used is at half price being off-peak) in favour of the heat pump per kWh of heat put into the water. Even if half of it gets wasted, it's still a bit more energy efficient and considerably cheaper than letting the dishwasher heat its own water.