Can dishwashers be fed with hot water rather than cold?

[simoncmf]

Anyone out there have an answer for this one?

I have just had a scarily efficient and very expensive condenser boiler fitted. I am also having solar panels heat the water going into the boiler, so I am expecting my gas bills to plummet (45{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} is the promise!)

My question is this: can I connect my dishwasher (Diplomat 8452) so that it fills with hot water rather than cold water? I would prefer my boiler to do the lion’s share of heating the water, rather than the dishwasher itself. Is there any technical reason why this would be a bad idea?

Thanks for any advice you might have.

Simoncmf

[kwatt]

Not if you want it to perform properly no, it’s not advisable.

Detergents are designed to operate from cold and certain elements only come into play at particular temperatures.

Apart from which it’s less economic and eco-friendly than just running it with cold water. Running an 85,000 BTU boiler to fill the dishwasher that burns a coupe of kW per cycle strikes me as a tad excessive when only one load of water actually requires to be heated.

K.

[admin]

Re: Can dishwashers be fed with hot water rather than cold?

I always understood calcium removes better in cooler water…try rinsing a glass thats had milk in it in hot and cold and see the difference.

kevin

[iadom]

Re: Can dishwashers be fed with hot water rather than cold?

Also, if your hot water pressure is much lower than your cold, you could have problems with the timed fills that several dishwashers use.

[Kirk]

Re: Can dishwashers be fed with hot water rather than cold?

Also if your Hot water is to hot it will turn the softener crystals to jelly and stop it working. Kirk

[Penguin45]

Re: Can dishwashers be fed with hot water rather than cold?

Not to mention that the heating period is factored into the design – hot water = shorter wash = poor cleaning results.

Regards,
Penguin45.

[Martin]

Re: Can dishwashers be fed with hot water rather than cold?

My Bosch Dishwasher is on a HOT WATER supply (GV-E750. FD6206) as has done a great job every day now for over 22 years!

As a result, I don’t hold with some of the theories muted on the subject based on my experience 🙄

Martin

[kwatt]

Point taken Martin, but yours is a 22 year old machine, not a modern machine which is entirely different on fill levels and performance. In those days some manufacturers stated that the machines could be hot filled, now it is not recommended by any that I am aware of.

K.

[Martin]

Re: Can dishwashers be fed with hot water rather than cold?

Very true Ken…just teasing… :stir:

All Bosch/Neff/Siemens dishwashers pre 1996 will work fine using a hot water supply provided it not exceed 60 degrees Celsius (incoming supply).

Post 1996 and it is indeed COLD ONLY unless you buy a Hobart Commercial machine that is? (ASEA also allowed a hot supply to them at one time too as I recall?)

Martin

[dpm]

Perhaps a compromise of a warm fill via a thermostatic blend valve? They’re commonly used around nursing homes etc now and aren’t as dear as they once were.

[iadom]

Re: Can dishwashers be fed with hot water rather than cold?

The early Hotpoint (bosch) models 860 & 870 did have problems if the hot water pressure was very low, these models had a special glass washing programme that used timed fills and results would suffer on a hot supply with poor pressure. A service TIB at the time advised us to tell customers to use cold only on these two machines.

[admin]

I need a new dishwasher i take it from reading this that Bosch is probably the make to go for as yours has lasted 22 years?

[admin]

Re: Can dishwashers be fed with hot water rather than cold?

I would not apply 22 years of good operating order that martin has achieved to a new appliance, more like 7 to 10 years maximum in my opinion.

Kevin

Ps don’t be put off the bosch though, its far better than many mainstream manufacturers.

[Penguin45]

Re: Can dishwashers be fed with hot water rather than cold?

You won’t get 22 years out of a new anything these days. Bosch is decent enough though. Bear in mind that you get what you pay for.

Regards,
Penguin45.

[admin]

Any advice on what makes i shoud be looking out for? mentioned Bosch coz seen one on coop website for £206 model SGS43C12 any good? was looking to spend more but this has an AAA rating

[Author]

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