Thread Number: 2680
hot water temp for dishwasher |
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Post# 73926 , Reply# 1   7/17/2005 at 06:19 (6,829 days old) by toggleswitch (New York City, NY)   |   | |
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Well: Lowering your water heater's temperature will (IMHO): 1- Save energy 2- Extend the life of the water heater. 3- Be safer for showers and hands. 4- May prevent damage to certain plastics in the DW- [knife handles, pot handles, cuttingn boards, etc.] 5- May prevent damage to some glassware- super hot water hitting a room-temp drinking glass may shatter it. Leaving the temperature at a higher setting: 1- whiter-than-white whites in your laundry, assuming you pre-wash in warm or cold to avoid "setting" protein-based stains 2- Quick DW loads. Here is my opinion: Although the extra time needed to reach operating temp may improve performance, super hot incoming water aslo improves performance. Six of one and half-a-dozen of the other? Personally I would install a 2 gallon(8 litre) tiny water heater or instantaneous water heater in-line with the DW (perhaps located unde the kitchen sink) and put it on a one-hour wind-up timer [as seen in bathrooms in hotels for the heat-lamp]. In this way you can have it both ways- pre-heated or non-preheated incoming water. regards, Steve |
Post# 73961 , Reply# 3   7/17/2005 at 09:44 (6,829 days old) by PeteK (Ontari ari ari O )   |   | |
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Post# 73968 , Reply# 5   7/17/2005 at 10:40 (6,829 days old) by appnut (TX)   |   | |
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Chuck, I keep mine between 115 & 120 degrees. And that's evryday use. When I do whites, I let the heater heat up to 140 or so while I'm pre-soaking in lukewarm for about 1/2 an hour. Then I turn it back down and let the most important load needing hot water to begin to take down the hot water, thus saving me electricity.
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Post# 73990 , Reply# 6   7/17/2005 at 14:43 (6,829 days old) by gansky1 (Omaha, The Home of the TV Dinner!)   |   | |
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Do not turn the water heater below 120F. There are a number of bacteria that thrive and multiply rapidly in water (even tap water) at temps less than 120F. Leigionella bacteria, the most dangerous, multiply rapidly at lower water temps. Many state regulatory agencies and health department concerns have statutes in place that outgoing water temps from the heater be 125F-140F.
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Post# 74112 , Reply# 7   7/18/2005 at 12:26 (6,828 days old) by toggleswitch (New York City, NY)   |   | |
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In my case the oil- fired steam-generatig boiler creates steam for heat and has an instantaneous coil for hot water. Obviously, in the winter the water is way too hot. I installed a non-electric (mechanical) thermostatic temepring (mixing) valve that pre-mixes the hot water coil's output with cold water to shoot cooler water in to the hot water pipes. Once I learn how to solder water pipes, I will run another main pipe with super-hot water to my 2 washers and two dishwashers- and leave the bathroom(s) and kitchens using the tempered/cooler/safer water from the current feed pipe! |
Post# 74114 , Reply# 8   7/18/2005 at 12:29 (6,828 days old) by toggleswitch (New York City, NY)   |   | |
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Post# 74203 , Reply# 10   7/18/2005 at 22:44 (6,828 days old) by toggleswitch (New York City, NY)   |   | |
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Here I believe we are still advised in many user's manuals to run the water at the tap nearest the machine (in question) until it it hot. Maybe old WP DWs (60s ?)had the right idea -two closed detergent cups and a pre-rinse before that sought to purge the cold water out of the lines!! At least the water was put to good use!!! |
Post# 74305 , Reply# 11   7/20/2005 at 07:48 (6,826 days old) by whirlcool (Just North Of Houston, Texas)   |   | |
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With our BOL Kenmore Dishwasher we always run the tap next to the dishwasher before starting it to get hot water. The hot water heater is not that far away and within 20-30 seconds we have 160F heat at the dishwasher/laundry room. We are satisfied with this machines performance and this is probably the reason why. |
Post# 74364 , Reply# 12   7/20/2005 at 23:32 (6,826 days old) by geoff (Cape Coral, FL)   |   | |
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Our hot water is oil fired and set at 170 degrees. Never ending hot water. We have our oil price contract fixed very low so I think it's a matter of what costs more. Heating the hot water in the dishwasher or the water tank. I do know that in our case, on the Anti-Bacterial setting with Extra Hot Wash selected, the dishwashers maximum temp is 20 degrees lower than our hot water temp. We just use whatever cycle suits the load and know that regardless of setting we are getting 170 degree washes and rinses. In our case it's cheaper to heat the water in the tank than in the dishwasher. I guess it's all relative and personal preference.
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Post# 74391 , Reply# 13   7/21/2005 at 06:45 (6,825 days old) by toggleswitch (New York City, NY)   |   | |
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