Pre-paid meter over charging?

[AndyD]

Sorry Dave, I wasn't making conspiracy theories



I think it's stating the heat losses through the insulation as an electricity consumption figure as well but it's a bold figure to state without any qualification. There's a few things that should also be stated such as the difference between surrounding ambient air temperature and the temp of the water in the cylinder during the test. Also does this loss refer to a cylinder with insulated or lagged inlet and outlet pipework or one without pipework lagging. Finally does this refer to a cylinder under normal day to day use which would have temperature variations or one that's sitting static under fairly constant temperature (although I'm not sure how you'd measure the losses accurately when it's being used) .

It would be interesting to slap a data logger on an unused cylinder for a day and see how close this figure is under real life conditions. It sounds very optimistic to me.

[Justloadit]

Hi Andy,

No so sure, if your geyser is not being used at all, then the heat loss would be through the hot side outlet pipe, which in the grand scheme of thins is relatively small. If you allowed the geyser to heat say to 60 degrees, then switched the power off for 24 hours, and not used the water, the temperature would not drop more than about 10 degrees.

When I go away for the week end, I usually switch the power to my geyser, when I get back, and run the water it is well hot enough for a shower, which could be around 40 degrees or so, and that is after almost 48 hours standing.