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Dishwashers vs. hand-washing: Which is cheaper?

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General Electric/File

(Read caption) A GE Monogram dishwasher. Washing dishes by hand may be slightly cheaper, but the time a dishwasher saves is a value in itself.

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Saving Pennies or Dollars is a new semi-regular series on The Simple Dollar, inspired by a great discussion on The Simple Dollar’s Facebook page concerning frugal tactics that might not really save that much money. I’m going to take some of the scenarios described by the readers there and try to break down the numbers to see if the savings is really worth the time invested.

Marie writes in: Did you ever do a cost analysis on dishwashers vs. hand washing dishes??? My dishwasher is not functioning properly [I may overstuff the thing] wondered if the old fashioned way is better economically.

This is a really tricky one to quantify, because the real cost in washing dishes comes from the cost of hot water. This is easily the largest cost component of doing a batch of dishes, as one often uses \$0.40 or \$0.50 of heated water in doing a batch, whether in the dishwasher or in the sink.

There’s also the problem of variability in that some dishwashers use more hot water than others and some people use more hot water than others. It’s very hard to precisely quantify these things for such a comparison.

If you want to minimize hot water use while handwashing dishes, the way to do it is to fill one basin with hot water and soap, then use cold water to rinse your dishes after they’re scrubbed. This generally uses less hot water than the average dishwasher, but even then, it’s hard to quantify exactly how much.

So, to distinguish between the two, we have to largely ignore water.

What costs are we left with, then? For starters, dishwashers run on electricity. This report estimates that a dishwasher unit uses somewhere around 1.5 kWh on average to run a load of dishes, excluding the costs of the incoming water. That’s a cost of about \$0.17 or so in the average American home.

There’s also the startup cost of owning a dishwasher. This, of course, relies on the assumption that a kitchen sink is a “default” piece of equipment in a home and a dishwasher is not, which matches my experience growing up (and my first places where I lived after moving out) quite well.

This site estimates the lifespan of a mid-range dishwasher as being approximately 10 years and having a cost of \$500. That adds up to \$50 per year. This report estimates that an average dishwasher runs 215 loads per year, so you’d have a cost of about \$0.46 per load for the cost of the dishwasher.