How to do washing using off-peak?

[Rodders53]

The drier at 600 watt for a few hours, yes worth waiting for the off-peak.

OK you have me wondering, now. I'm off to fit a Meross smart socket with energy monitor to the Miele Heat Pump tumble dryer to know how much it uses from today onwards )for a while, at least).

To be frank I had no idea how little the washer was actually costing in electric. The circa £40-50 of detergent per annum is the biggest cost followed by the roughly £17 for water and sewerage, plus a bit for the water softener salt blocks!

The ensuite towel rail (180W element) has used almost double the electric of the washer!

 

[ericmark]

The 2.5 hours is not simply times by 650 watt which my tumble drier uses, as it depends on the load, with a light load, it uses a mark/space system to reduce the output near the end of the drying cycle.

Here is one I did earlier. But not all loads will give this patten, my monitor only shows an hour, so this is a number of pictures combined.

Comparing a vented drier with a heat pump drier, I can't turn the vented down to 650 watt, but the one I had would turn down to 1 kW, and would take around 90 minutes, the maximum time I could set, sometimes it needed turning on again, as not quite dry, but it means not so cut and dried as to if the vented or the heat pump used less or more power to the other.

The condensing drier, be it water, room air, or heat pump cooled, has no option to change the time it takes to dry, so one can't compare a drier taking an hour with a drier taking 2.5 hours, but the vented drier often had the option of one or two elements, with a simple switch, and we see 2 kW = 1 hour and 1 kW = 1.5 hours so clearly the longer taken to dry, the less energy used.

 

[Harry Bloomfield]

so clearly the longer taken to dry, the less energy used.

Evaporation, requires energy input. The dryer the washing becomes, the less evaporation, the lesser the energy input needed, to cause the evaporation.