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Subject:  Re: New Dishwasher Arrives in the Morning! Date:  12/14/2012  2:13 PM
Author:  LQu Number:  869586 of 901198

The Sears salesman pointed out that they don't have a heating element. He warned us not to open the door in the last hour of the cycle because that would let all the heat out and the dishes would take days to dry.

<head-desk> The Bosch DOES have a water heating element. It has what's called a a flow-thru water heater. It pumps the hot water thru a heating chamber that's under the interior floor of the dishwasher, rather than having an exposed heating coil sitting passively in the bottom of the machine.

There are also some models (not all) that come with an Sani-Rinse option that uses a NSF certified, high-temperature rinse. They use the built-in heating element. It is rated to eliminate 99.999% of certain bacteria. The water has to reach at least 160 degrees for a specified minimum amount of time, IIRC. Bosch, Kenmore, Kitchenaid & Whirlpool have them now, to name a few. Models can be found here:

If the Bosch didn't have a heater, it couldn't offer NSF rated machines, among other things <insert rant about uninformed salespeople>.
(you'll note listings of "flow thru water heater" or "concealed heating element")

Bosch Manual
Flow-Through Heaterâ„¢:Heats water to a temperature of up to 161°F.

Condensation Drying: A high temperature final rinse, a low temperature stainless steel tub, and the sheeting action of a rinse agent esult in drying that is hygienic,energy efficient, and economical.

What it DOESN'T have is a heating element within the tub itself. That prevents plastics and other items from being heat-damaged if they fall out of the rack. But is also prevents using a heating element for a drying cycle.

Unlike what another poster mentioned, you don't have to increase the temperature of your home water to use a Bosch. This does, in part, contribute to their more efficient energy rating. If one never uses the drying heater on any machine, maybe that would make s Bosch be not-quite-as-efficient-in-comparison as one expected.
Hot Water Supply: Bosh recommends that the hot water heater be set to deliver approximately 120° F (49° C) water to the dish-washer. Water that is too hot can cause some detergents to loose effectiveness. Lower water temperatures will increase run times. The hot water supply pressure must be between 5 - 120 psi (0.3 - 8.27bars).

The salesperson was also incorrect about "days" to dry the dishes. I also just open the door. Works just fine. Plates, glasses & cups will be dry within minutes from the steam evaporation if you open it right at the end of the cycle. The plastics don't dry as fast - they need some air time. But hours, not days. Just like in a dishrack. Frankly, I think opening the door is faster than the "Condensation Drying" (see above) Bosch employs. At least for plates & glasses. But maybe that perception is off, as I don't use a Bosch year-round - they're at our vacation/rental properties.


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