Even with a built in internal dishwasher heater - Running a cold water
pipe to a dishwasher is not advisable. Depending on the model it will
either take excessive time to complete the wash cycle while the water
heats up, or it will just plain not clean the dishes properly.
In a residential situation, usually one big hot water heater is better
than two medium size ones. The point-of-use heaters are more
expensive, trickier to install and adjust, and require venting to the
outside (for the non-electic models). You may find that a single
point-of-use may not be the most economical solution for one
Not advisable. It is to boost the temperature of already heated water to
proper temperature and it does not heat it for every cycle so you'd have
cold rinses. If you have a more efficient way of heating water than
electricity, that is a cost factor also.
Hi Edwin -
I guess I have too much time and money on my hands :-)
I am retired.
I bought a house about 90 feet long with two water heaters - one on each
end. They are each 50 gallons each. All the pipes are in the slab.
My problems -
1. I must wait 90 seconds before I have hot water in the bathrooms -
they are served by a water heater 90 feet away through a 3/4 copper
buried in the slab.
2. I am keeping 100 gallons of water heated for two people - in one day
- we each shower at about 10 AM - then do one load of laundry at 11 AM -
then do a load of dishes at 6 PM. That's it.
3. The second 50 gallon water heater - which is next to the bathroom -
serves one thing - a clothes washer - isn't that stupid?
Everything works fine. I just want to correct those problems.
You will thing I am really nuts when I tell you I have a 20 x 40 x 8
swimming pool and a hot tub - heated by a 400,000 BTU gas heater.
Long story - they were in the house when we bought it.
The Magic Chef dishwasher we bought in 1977 had us asking the same
question in later years; the factory wrote us back that there was never
more than five quarts in the machine at any one time. I believe it had
four water cycles, so it used five gallons per complete wash.
It still did a passable job of washing when we gave it away during our
2002 move; needed one bottom seal kit, one soaking of the motor bearings
and shaft in oil after that, and one door seal kit its whole life. And
we didn't know any better and ran it on the liquid detergent.
That doesn't narrow it down much :(
Some model# helps.
Makes, models will vary from d/w to d/w. The use&care manual that came
with the d/w may have the gallons per cycles used ( EG: rince and hold,
Reg, Pots and pans, etc ).
Appliance Repair Aid
Have you checked Consumer Reports? They sometimes give info like that.
If you want to really know then unhook the drain tube and run a load into a
couple of 5 gal buckets. Repeat for each of the different cycle options.
Probably be interesting to do even if you did find the manufactures claims.
Are you more concerned with just water usage or 'hot' water consumption? If
I anticipate running out of hot water from showers and laundry etc., then I
will run the dishwasher last. My DW will heat the incoming water with the
heating elements if not hot enough.
Hi Kevin -
I am concerned about hot water only. I have two 50 gallons water heaters
- one by kitchen - one on the other end of the house by laundry. The one
in the kitchen serves two bathrooms 90 feet away. I know it is stupid -
but I bought the house this way.
I plan to put one new tankless water heater right next to the bathrooms
and maybe run an insulated line up and over to the kitchen. The kitchen
has a sink and dishwasher - that is all. I was thinking maybe an under
sink water heater could serve the sink and dishwasher.
I am just in the planning stage. I hate waiting 90 seconds for hot water
in the bathrooms. :-) I also hate that I am heating 100 gallons all the
time for two showers - a load of clothes - and a load of dishes daily.
I know - I have too much time on my hands :-)
Money is no object within reason. Also the utility company will give me
$450 for each electric water heater I replace with a gas one.
tankless have lots of downsides. your probably better off installing standard power vent gas tank units and add a recurcilate pump so you waste zero water. you puh a button when you need hot water and the pump turns on.
you have instant hot water when you turn it on
water heater manufacturers are moving to more fficent heaters, waiting a few months should get you the new more efficent design
If the OP would let us know which brand/model he has, I think someone
here might be able to check and find out. They vary from about 3.5 gal
to 11 gals for a normal cycle, entirely dependent on the particular
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