How does it work?
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Area of usage
Advantages of induction water heating
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Brands that offer induction geysers
Induction geysers are apparently a new-gen technology that uses the magnetic induction process to heat water. This induction process helps in heating a larger surface area of water in the tank, compared to a traditional geyser. This technology also allows the water to heat more quickly that eventually reduces the overall electricity usage. Induction geysers can reduce the electricity consumption required to heat water by 33%. Although these geysers don't reduce the electricity cost like the ones that run on solar energy , they do offer more economical and energy-efficient substitute. Induction geysers are commonly divided into two parts, the generator unit and the storage tank.Induction heating is the process of heating a metal (or any material that conducts electricity) by inducing an electric current through it. The primary coil is connected to the AC power source in induction geysers. The alternating current creates a magnetic field that induces a voltage in a different coil, which is also called the secondary coil. The secondary coil is usually submerged in the tank that contains water. When the current flows through the secondary coil, heat is released into the water, therefore raising its temperature. There is no direct AC near the water which makes these geysers much safer than the traditional ones.The smaller induction units are best suited for kitchen and single shower usage, while the bigger ones offer more hot water for the consumption needs of larger families. Induction geysers are also well-suited for holiday homes as they can be turned on during arrival, to get hot water in very little time for its rapid heating mechanism.There are multiple advantages of heating water through the induction process. Some of the advantages are listed below:There are a number of brands that offer induction geysers in our country which are available both online and offline in India. Some brands that offer these products through the Amazon e-commerce site are -- Crompton, AO Smith, Lifelong, Venus, Racold, Bajaj, Anchor by Panasonic Astra and others. The prices of these appliances range from Rs Rs 6,000 - Rs 15,000 (depending on features) and usually come with a storage capacity that varies from 3-litres to 6-litres. Havells comes with Magnatron water heater. They claim to offer India's first water heater with 'Element Free' induction heat transfer technology.
I absolutely love this thread. It is one of the clearest demonstration of the complexity of "energy efficiency" discussions on one end, and of how something as trivial as heating water is in fact, a pretty deep and somewhat convoluted thing.
I am one of the few human beings alive having visited multiple electric water heater factories (these guys don't joke around their industrial secrets!) I have been amazed at how complex and counterintuitive heating water can be.
In strictly electric heating, there's no doubt that resistive wins, if for no other reason that there's little else to measure it against and for most of the reasons listed below. In no way does this mean it's the best or the most efficient, but merely that "it's the best we have for the money".
The conductive heat loss is not insignificant and (for most north-american models) hovers around 90W h. So efficiency should also relate to conservation. Or storage. Whatever energy buzzword you want to tack on there.
Efficiency also means having a durable, reliable equipment. And truth be told, the vast majority of EWH elements have grown to be absolute garbage over the past decade, leading to a record number of failures. These are generally not noticed in 2-elements tanks, or at least, not as much.
It's also helpful to know that US-made and Canadian-made EWH are not the same: they do not answer to the same efficiency standards and while they look similar there are key differences in their designs, not the least of which the number of elements and the temperature set point.
Finally, take other means "more efficient" means with a grain of salt: heat-pump EWH are incredibly efficient. They are also the worse possible idea in nothern climates... Geography counts a lot for "efficiency" and one needs to consider that the current resistive type might not be perfect, but it is the sum of all compromises and currently the one that serves us the best. Can we do better ? I sure hope we can :)
As for the OP's question, well, there are people (yours trully being one of 'em) working on induction-based water heating, not out of efficiency concerns, but out of public health concerns. Legionnaire's disease is far more rampant in EWH than most like to admit, and for areas where only electric is an option that are unfortunate to have that particular bacteria in abundance, there needs to be cheaper, more efficient solutions. That's part of what we're working on.
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