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When we lived in South Africa, we had a 500Litre boiler that was always on. But it was insulated by the factory and the theory was that on night tariff 23:00-4:00, at 80% cost, we could heat the water up to 80degrees and before it reaches 22:00 the water is still 50ish degrees celsius. But if we used up the water we would have to manual override it and get ...


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You will always (always!) save energy by turning the heater off when you don't need hot water. How much energy you save depends on the efficiency of the water heater but you will always save energy - it doesn't matter what size your tank is or how well is is insulated. The ultimate reason for this is "the rate of heat loss of a body is proportional to the ...


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The answer as to how much it costs to keep the water hot 24/7 will depend on a number of factors: size and shape of tank, effectiveness of insulation, temperature of surroundings and of the heated water. FWIW, my standard 180 litre electric hot water heater has a data plate that claims a standby loss rate of 76 Watts. That doesn't seem to present much ...


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This is probably along the same sort of idea as turning off the A/C via the breaker in the winter. A dose of paranoia (what if the heater stays on all day because the thermostat is broken?) and a little bit of sense. Assuming that your water heater is not a perfect insulator, you are probably losing some money by keeping the water heater at a good ...


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Can't find that one. Another company's model that gives numbers (after looking more - MANY don't, which seems sketchy) claims 10mA @ 24v, or 0.01A x24V = 0.24W - less than 15, yes; Quite a bit more than 0.002, though. Whether it's actually worth buying (since you mention that it's expensive) would depend on how much you pay for power and how many hours it ...



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