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Thread Number: 84821
/ Tag: Modern Dishwashers
Dishwasher Power Usage |
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Post# 1092852 10/11/2020 at 14:36 (1,286 days old) by DADoES  (TX, U.S. of A.) |
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 I ran an updated test with my Kill-a-Watt meter on power usage for a load of dishes. Normal cycle, which heats the wash to 140°F, final rinse to 150°F. Initial estimated time 115 mins, extended as needed to reach the target temperatures. I didn't clock what was the full time. Water heater is normally set at 104°F. I raised it to 123°F an hour before starting the dishwasher for washing a load of bedding, and hand-washed an item at the sink, so the supply line was fully purged to a hot flow at that point. The water heater reverted back to 104°F by the time the dishwasher started so the supply line had only residual heat. Pump in drain mode = 30 to 40 watts Pump in recirculation mode = 120 to 125 watts Pump + heating element = 650 watts Drying blower = 7 watts Total power usage = 0.48 kWh Cost at my electric rate per last bill = $0.0527 | ||
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Post# 1092853 , Reply# 1 10/11/2020 at 14:53 (1,286 days old) by chetlaham (United States) |
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Post# 1092878 , Reply# 3 10/11/2020 at 19:29 (1,286 days old) by Frigilux (The Minnesota Prairie) |
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| Post# 1092935 , Reply# 4 10/12/2020 at 10:52 (1,285 days old) by johnb300m (Chicago) | ||
104?
Not to be a nudge, but water heater at 104 degreees is in the sweet spot for Legionnaires bacteria.
Jussayin. CLICK HERE TO GO TO johnb300m's LINK | ||
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Post# 1092939 , Reply# 5 10/12/2020 at 12:52 (1,285 days old) by DADoES (TX, U.S. of A.) |
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My water heater is a tankless unit. It heats only when water flows through it. The only way to keep it continuously hot is run hot water 24/7, which defeats the purpose. :-) | ||
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Post# 1092941 , Reply# 6 10/12/2020 at 13:06 (1,285 days old) by luxflairguy (Wilmington NC) |
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What's the fuse size for these? Very professional install!! | ||
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Post# 1092946 , Reply# 7 10/12/2020 at 13:54 (1,285 days old) by DADoES (TX, U.S. of A.) |
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Water heater is two 60s at top left. 50 beneath is range. 60 and 30 at top right is HVAC air handler. 30 beneath is dryer. Pic 2, eight 40s on the water heater subpanel. | ||
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Post# 1092948 , Reply# 8 10/12/2020 at 14:15 (1,285 days old) by luxflairguy (Wilmington NC) |
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WOW! Thanks! | ||
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Post# 1093223 , Reply# 9 10/15/2020 at 07:29 (1,282 days old) by ozzie908 (Lincoln UK) |
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Daft question but  | ||
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Post# 1093225 , Reply# 10 10/15/2020 at 07:30 (1,282 days old) by combo52 (50 Year Repair Tech Beltsville,Md) |
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DW Power Consumption Hi Glen I love this post, it is always fun to see accurate numbers on power and water consumption etc on home appliances.
I assume that these figures are for one of your F&P Dish-Drawers.
I have often wondered on my WP DWs how much the power use is affected by the amount of dishes are in it since the heater must heat all the dishes in addition to the water. It would be interesting for you to run your DW empty to see how much difference it makes.
John L. | ||
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Post# 1093543 , Reply# 11 10/17/2020 at 19:10 (1,280 days old) by DADoES (TX, U.S. of A.) |
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Post# 1093546 , Reply# 12 10/17/2020 at 19:32 (1,280 days old) by wayupnorth (On a lake between Bangor and Bar Harbor, Maine) |
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Post# 1093563 , Reply# 13 10/17/2020 at 21:34 (1,280 days old) by DADoES (TX, U.S. of A.) |
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Austin, It's the only water heater in the house. I've not yet in 15.5+ years had an incident of insufficient heated water. I know electric tankless is not usually chosen, in favor of gas. Reasons the builder opted for electric presumably are 1) there is no natural gas service in this little neighborhood outside town and 2) both bathrooms have whirlpool tubs so sufficient capacity is needed to handle them. I've never had a need to fill both at the same time but filling one would challenge a typical-size tank heater. | ||
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Post# 1093578 , Reply# 14 10/17/2020 at 23:36 (1,280 days old) by Launderess (Quiet Please, There´s a Lady on Stage) |
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"dishwasher for washing a load of bedding" | ||
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Post# 1093585 , Reply# 15 10/18/2020 at 00:51 (1,280 days old) by tolivac (greenville nc) |
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Use the right tool for the right job? | ||
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Post# 1093587 , Reply# 16 10/18/2020 at 01:45 (1,280 days old) by marky_mark (From Liverpool. Now living in Palm Springs and Dublin) |
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 Great information, Glenn. I like experiments like this! Thanks for posting.
If you connected your dishwasher to cold water, my understanding is that in your situation it would cost you less. The dishwasher would use more energy but your tankless electric water heater would use nothing. Overall you would save energy. Different dishwashers (and cycles) respond differently to this and performance may increase, decrease or stay the same. Some add more time. It would be interesting if you tried running another load with the water heater turned off and no hot water remaining in the pipes. If you do, please post the results!
It sounds like your electricity rate must be fractionally under $0.11/kWh. I wish it were that cheap here in SoCal! We pay less than $0.04/kWh for gas but electric rates are tired and I pay between $0.22 and and whopping $0.35/kWh! I have a gas water heater and a hot water circulation pump, so hot water is immediately available everywhere including at the dishwasher for every fill. So it makes a lot of sense to have my dishwasher hooked up to hot. It is cheaper for me but does use more energy. | ||
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Post# 1093599 , Reply# 17 10/18/2020 at 06:49 (1,279 days old) by ozzie908 (Lincoln UK) |
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Dadoes ....
I am suitably impressed that your heater is able to supply all the needs it goes to prove there is no need for a tank of hot water to sit there waiting to be used.
Does the heater need any maintenance ? Am curious as never seen a house version it reminds me of our electric showers they are 8.kw and heat straight away so no waiting etc. Austin | ||
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Post# 1094122 , Reply# 18 10/22/2020 at 23:51 (1,275 days old) by DADoES (TX, U.S. of A.) |
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Post# 1094126 , Reply# 19 10/23/2020 at 02:39 (1,275 days old) by foraloysius (Leeuwarden, Friesland, the Netherlands) |
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Post# 1094142 , Reply# 20 10/23/2020 at 07:25 (1,274 days old) by combo52 (50 Year Repair Tech Beltsville,Md) |
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For Descaling | ||
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Post# 1094159 , Reply# 21 10/23/2020 at 08:52 (1,274 days old) by DADoES (TX, U.S. of A.) |
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Post# 1094167 , Reply# 22 10/23/2020 at 10:04 (1,274 days old) by DADoES (TX, U.S. of A.) |
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Post# 1094168 , Reply# 23 10/23/2020 at 10:06 (1,274 days old) by combo52 (50 Year Repair Tech Beltsville,Md) |
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Post# 1094169 , Reply# 24 10/23/2020 at 10:10 (1,274 days old) by foraloysius (Leeuwarden, Friesland, the Netherlands) |
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| Post# 1094172 , Reply# 25 10/23/2020 at 10:53 (1,274 days old) by Pierreandreply4 (St-Bruno de montarville (province of quebec) canada) | ||
kitchenaid dishwasher | ||
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Post# 1094360 , Reply# 26 10/24/2020 at 13:45 (1,273 days old) by DADoES (TX, U.S. of A.) |
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Normal Eco again. 125°F wash and rinse. 88 mins initial time. 88 mins clocked time. Purged the supply line to warm @ "normal" 104°F water heater setting. 0.36 kWh usage. Norther came through last night so cooler ambient (current 64°F) than the previous Normal Eco test. Well & pump is at front corner of the property, feed line runs all the way around back of the house to the water tank in the detached garage on the other side. | ||
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Post# 1095956 , Reply# 27 11/5/2020 at 12:50 (1,261 days old) by DADoES (TX, U.S. of A.) |
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No power stats on this load. At back-to-front under the left side shelf: A small mixing bowl, mug (hot chocolate, I don't drink coffee), a 3rd of the ceramic bowls with handle, and soup bowl that matches the plates. What's marginally interesting is the styrofoam take-out cup on the right side shelf (weighted by the scraper) came out 100% clean, although largely shielded from spray by the bowl beneath. It had fat globules from pork chop trimmings saved for S.P. | ||
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Post# 1096070 , Reply# 28 11/6/2020 at 09:58 (1,260 days old) by SudsMaster (SF Bay Area, California) |
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