Molly Ayala
Geysers are a significant source of electricity consumption, accounting for up to 40% of a household's electricity bill. The question of whether turning off a geyser saves electricity has sparked much debate, with professionals arguing that it may not lead to substantial savings. This is because when a geyser is switched off, the water inside cools down, and reheating it requires a significant amount of energy. On the other hand, keeping the geyser on at a low temperature with proper insulation can help maintain the desired temperature with less energy consumption. Various methods to improve geyser energy efficiency are suggested, including using timers, geyser blankets, and energy-saving showerheads.
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What You'll Learn
Geysers consume less electricity when kept on
Geysers are like giant kettles, with an element inside that heats the water to a set temperature. When hot water is used, cold water rushes in to replace it, and the element kicks in to heat the water back up. If the geyser is kept on, the water is permanently at high temperatures, requiring little to no heating from the element. The element will only use higher amounts of electricity after the hot water has been used and new, cold water refills the geyser chamber.
The main argument for switching off your geyser is that when it is off, the element is not heating the water and therefore not using electricity. However, this does not take into account that once switched off, the water in the geyser eventually cools down completely, and when switched on again, a huge amount of energy is required to heat the water back up to temperature. In most cases, more energy is used than if the element was periodically kicking in throughout the day.
According to professionals, turning off your geyser will not save much electricity. For 24 hours after the geyser is switched off, only 10°C of heat is lost, and this is called a 'standing loss'. Using this slightly cooler water instead of reheating it may save a small amount of electricity, but when the geyser is turned back on, the electricity needed to reheat the water will cancel out those savings.
To save electricity, you can insulate your geyser with a thermal blanket, as well as insulating the pipes, to prevent heat from escaping the geyser and thus using more energy to compensate for this loss. You can also control the operational times of the geyser using a timer, which can add between 15% and 18% savings.
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Switching off a geyser doesn't save electricity
A geyser is like a giant kettle, with an element inside that heats the water to a set temperature. When hot water is used, cold water rushes in to replace it, and the element kicks in to heat the water back up.
The argument for turning a geyser off is that the element will not periodically kick in to heat up the water, and therefore less electricity will be used. However, this doesn't take into account that when the geyser is switched back on, a huge amount of energy is required to heat the water back up to temperature. In most cases, more energy is used than if the element was periodically kicking in throughout the day.
According to professionals, including Eskom's Geyser Fact Sheet, turning off your geyser will not save much electricity. For 24 hours after the geyser is switched off, only 10°C of heat is lost, and using this slightly cooler water instead of reheating it may save a small amount of electricity. However, when the geyser is turned back on, the electricity needed to reheat the water will cancel out those savings.
A better way to manage electricity demand is to use a timer on your geyser. This ensures that the geyser is off during peak demand periods, and that it only operates to meet your household's water usage requirements. Using a timer can make a significant difference in both cost and demand to the consumer and the grid.
Another way to reduce electricity usage is to insulate your geyser with a thermal blanket, as well as insulating the pipes, to prevent heat from escaping. Tests have shown that effective insulation saves about 20% of electricity when reheating a geyser that has been off for 24 hours.
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Using a timer can help manage electricity demand
A geyser is like a giant kettle, heating water to a set temperature. When hot water is used, cold water enters the geyser, lowering the temperature, and the element switches on to heat the water again. This cycle can happen 15-30 times per day, wasting electricity when heating water when it is not required.
Using a timer on your geyser is a more efficient way of managing electricity demand. By switching the geyser off during peak demand and operating it based on the water usage patterns of the household, you can make a significant difference in both cost and demand to both the consumer and the grid. For example, a family that needs hot water in the morning and evening for showering doesn't need their geyser running 24/7. With a timer and blanket installed, having the geyser come on at around 4 am and off at 6 am will provide enough hot water for the morning. You can then switch the geyser off until early evening, and then switch it off for the rest of the night. This way, the geyser is not running during peak demand periods and contributes to lower demand on the grid, while efficiently supplying the hot water needs of the household.
Controlling the operational times of the geyser using a timer can add between 15-18% savings over using a geyser blanket alone. A geyser blanket assists with reducing heat loss, keeping the water hotter for longer, which results in less electricity being used. However, when the geyser does switch on, the average saving achieved with a geyser blanket alone is only about 8%.
In addition to a geyser timer, energy- and water-saving showerheads reduce the flow volume of water by more than half. An average showerhead can use around 20 litres of water per minute, of which around 40% is hot water. In a single 5-minute shower, that amounts to 100 litres of water and 40 litres of hot water. Installing energy-efficient showerheads will reduce that flow to just 9 litres per minute.
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Insulation can reduce energy required to maintain temperature
Geysers, or water heaters, consume electricity when heating water to a set temperature. When hot water is released from the geyser, cold water rushes in to replace it. The geyser then uses electricity to heat this new water to the set temperature. This cycle can happen 15 to 30 times per day, leading to high electricity consumption.
Turning off the geyser when hot water is not required can help reduce electricity usage. However, when the geyser is switched off, the water eventually cools down, and a significant amount of energy is needed to heat the water again. Insulation can be used to reduce the energy required to maintain the water temperature and prevent heat loss.
Insulation helps to reduce heat transfer and maintain the temperature within a structure. It works by slowing down conductive and convective heat flow. Radiant barriers and reflective insulation systems are also effective in reducing radiant heat gain by reflecting heat away from the structure. The effectiveness of insulation depends on its R-value, which measures its thermal resistance. The higher the R-value, the greater the insulating effectiveness. R-values depend on the type of insulation, its thickness, density, temperature, aging, and moisture accumulation.
By installing insulation around the geyser, the heat loss from the water can be minimised. This means that the geyser will not need to use as much electricity to maintain the water temperature. Additionally, using a timer to control the geyser's operational times can further reduce electricity consumption by ensuring it only operates when hot water is needed.
Overall, a combination of insulation and controlled operational times can help reduce the energy required to maintain the temperature in a geyser, leading to both cost savings and reduced demand on the power grid.
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Solar water heaters can reduce electricity consumption
Geysers, or water heaters, work by using electricity to heat water to a set temperature. When hot water is released, cold water rushes in, decreasing the temperature, and the element kicks in to heat the water again. This cycle can happen 15 to 30 times per day, wasting electricity when heating water when not required.
There are two types of solar water heating systems: active and passive. Active systems have circulating pumps and controls, while passive systems do not. Active systems can be further divided into direct and indirect circulation systems. Direct circulation systems work well in climates where freezing is rare, while indirect circulation systems are popular in freezing temperatures as they use a heat-transfer fluid to heat the water.
Solar water heaters can be a cost-effective way to generate hot water, but they may not be suitable for every home. They require sufficient roof and interior space, and a well-insulated storage tank. Additionally, a backup system may be needed for cloudy days and times of increased demand.
To maximize energy efficiency, homeowners can also consider using a geyser timer, geyser blanket, and energy-efficient showerheads in conjunction with a solar water heater.
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Frequently asked questions
No, a geyser does not consume electricity after it has been cut off. However, when the geyser is turned on again, a large amount of energy is required to heat the water back up to the set temperature.
There are several ways to reduce your geyser's energy consumption:
- Insulate your geyser with a thermal blanket to prevent heat from escaping.
- Install a geyser timer to control the operational times of the geyser based on your household's water usage patterns.
- Lower the temperature settings on your geyser to an optimal level, such as 55°C to 65°C.
- Use energy- and water-saving showerheads to reduce the flow volume of water.
A common misconception is that turning off the geyser will always result in reduced energy consumption. However, if the geyser is only turned off for a short period, the energy required to heat the water back up may offset any savings. Another misconception is that the thermostat will automatically switch off the geyser when the water is heated, but in reality, the geyser may continue to operate and consume electricity.
