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[Marks DTM Calib]

The heating of cold water also helps the energy rating figures as a greater percentage of the consumed power is transformed into energy used as part of the wash cycle (water heating being close to 100% efficient)

[I_want_an_Omega]

It would make your min wash temperature 60C (temp of incoming hot water) - so less efficient that heating the cold water to 30C with electricity.
Steve

For a washing machine then yes, I can see the logic of that. But dishwashers dont have a similar cool wash (do they) and always seem "hot" to me at the end of the cycle.

Unless that hot water has been heated by PV Solar and would otherwise be sent back to the grid. I don't want to get into that whole debate here (please) as many on here regard solar as the domain of "retards". 

It is 

The old be seen to be doing rather than actualy doing (government/EU policy)

Now come along Mark - play nicely now 

[I_want_an_Omega]

The heating of cold water also helps the energy rating figures as a greater percentage of the consumed power is transformed into energy used as part of the wash cycle (water heating being close to 100% efficient)

Now that's a very good point. They can also start with "cold" water at agreed temp - but in reality it will fluctuate by time of year & many other local factors.

[aaronjb]

It would make your min wash temperature 60C (temp of incoming hot water) - so less efficient that heating the cold water to 30C with electricity.
Steve

For a washing machine then yes, I can see the logic of that. But dishwashers dont have a similar cool wash (do they) and always seem "hot" to me at the end of the cycle.

Mine has a 'cool' wash (40ºC, I think) but still heats the inside of the machine like an oven at the end to dry the dishes.. if I put that, the washing machine and the tumble dryer on all at once the kitchen is like a hot box (and the 'leccy meter is spinning like a top)

[Marks DTM Calib]

The heating of cold water also helps the energy rating figures as a greater percentage of the consumed power is transformed into energy used as part of the wash cycle (water heating being close to 100% efficient)

Now that's a very good point. They can also start with "cold" water at agreed temp - but in reality it will fluctuate by time of year & many other local factors.

The cold water temp does not vary as much as you would think as the temperature of the soil below a few hundred mm below the surface is petty constant.

Any heating would occur whilst its sat in the pipes in the house.

[05omegav6]

IIRC, ground temp is low teens

[Marks DTM Calib]

About 6-14 deg C at 1m from memory.

And around 3-8 deg C at 50cm.

http://www.halesowenweather.co.uk/soil_temperatures.htm

[Taxi_Driver]

I remember reading somewhere that biological washing powder has enzymes that are more active at low temperatures and killed off at higher temperatures, hence for them it is important that the wash starts out cool-ish and is warmed in the machine.

Right. I'm going to stop now as I'm starting to sound like a washing anorak when in reality it's a "pink job".

I always use non biological.....dunno why just always have....

My machine is next to the sink.....and has both hot and cold feeds.....i always run the hot tap in the sink first before i turn the machine on......if the water temp gets too hot for it.....it just lets cold water in to cool it 

and i think thats correct about the manu's using cold water feeds only is so they can get a A rated machine 

[ronnyd]

I wouldn't worry about it, we won't be using appliances once they get chipped to turn off when the demand for power gets above what the useless wind turbines can produce

So it's back to the Copper and  Posser with a Mangle, washing up in the sink, and cold storage will be the stone slab in the pantry

As for water ..... dig a well
I remember my mum lighting a fire under the copper when i was a kid