Hot water Vs cold water feed for dishwashers?

[vincentianpinner]

Just wondered if one is better than the other.
We've narrowed it down to 2 dishwashers and one - the Kenwood one wants cold and a hisense one wants hot water feed apparently. The two companies claim there's good reason for this but I suspect there might be a drawback somewhere?

 

[yorksbuilder]

At least 80% of them use cold water feed in the UK... they use such a small amount of water its not worth using your hot water, and having part of it sitting in your pipes from the boiler/cylinder, wasted

 

[foxhole]

So both are cold feed ? What’s the problem ?

 

[vincentianpinner]

So both are cold feed ? What’s the problem ?

If you look carefully you will see very clearly that one says hot and the other days cold. And I definitely didn't edit it because I wrote cold twice .

 

[foxhole]

If you look carefully you will see very clearly that one says hot and the other days cold. And I definitely didn't edit it because I wrote cold twice .

Except your post shows it was edited .Dishwasher does not need hot water feed to rinse so waste of time buying one , it also needs specific temp for different wash types which may mean the incoming water may be too hot leading to longer wash time as it waits for water to cool.

 

[Why Not Indeed]

You sure it's hot-only? Last time I looked at this, all the hot-fill dishwashers were actually hot or cold.

 

[cdbe]

My Miele is hot feed (though obviously still has a heater if you want to connect to cold). It's full of all sorts of fancy stuff and I believe it does things like extracts any excess heat from the water to use in the drying cycle etc. We have an unvented cylinder with a direct pipe to the dishwasher so it actually gets hot water not cold like a combi while it ramps up.

I did try to monitor electricity consumption as the machine can be set to display it in kw but it only shows full kw so not sufficiently accurate.

I can see no reason the makers would want to make their products use more energy (and sell less replacement heater elements).

 

[pto]

Kenwood and a hisense they wont last long anyway why o why go for cheeeep

 

[ericmark]

I note in the USA they use a hot feed, in the UK normally cold only, we were always taught washing with cold first, removes things like egg, before the hot water makes it go solid. And the dishwasher uses so little water, it would not get hot water anyway, as you need to run off too much cold for hot to reach dishwasher.

I assume in the USA they circulate the DHW so always hot at the taps? That is done with hotels and guest houses, but means all the DHW pipes need to be lagged, and plumbed in a ring, with a pump, so in the main in our homes, we just run the tap until hot water arrives, so rather pointless having a hot water fill on a dishwasher. Yes, DHW heated by gas is cheaper than heating by electric if, and only if, heating a lot of hot water each time you turn on the boiler, otherwise electric is cheaper, due to losses heating up the boiler each time.

Combination boilers save space, doing away with the storage tank, but cost more to run, due to heating the boiler and heat exchanger even for just a cup full of hot water. Yes, gas cheaper than electric, but not that much cheaper to be worth wasting both water and gas, heating up the boiler each time. Only when filling a bath does the combi boiler work out cheaper, if you have the time to spare waiting for it to fill.