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... an efficiency of around 65%
* The extreme power means you couldn't operate two such heaters in one house without blowing the company electric fuse (usually rated at 60 or 80amps in the UK).
There is a widespread, but somewhat misguided, belief that microwaves have some magical efficiency ...
Here in the Miami area, this 27kilowatt unit offers 7.3 gpm at 105 degrees F from an incoming 80 degree F water flow.
"immersion heaters get fouled and lose efficiency rather rapidly do to the increased insulation due to scale (efficiency/effectiveness)"Really?If my 4KW heater is scaled up, where does the energy go?A very small amount of heat must, initially, go into warming up the scale.But what can happen to the rest of the energy if it doesn't go into heating the water.OK, if the tank is poorly lagged there will be greater losses- though only very slightly.Eventually, the heater will burn out, but are you saying that it will have a shorter life than an induction heater's electronics?"May i question the value of the heat you are going to collect from my shower water please"Sure, you can ask the question. If nothing else, you could use it to heat the water feed to the hot water tank.With a bit more trouble, you could use it and a heat pump to seriously reduce the energy you need to heat water for showering/ bathing.
"Fouling of any heat exchange surface decreases the rate of heat transfer"Yes, in a heat exchanger, but not for a heating element.
My breaker trips about once a year (usually to tell me to descale my element, which i do once a year) I would LOVE to know if someone could point out, other than scale build up what causes my element to overload?
" it might normally be switching between say 0 and 50% on a 1 second cycle. "If your thermostat is switching in and out that quickly you need to increase the hysteresis- a lot.
Microwaves are only useful for heating a small quantity of water to make a hot drink but even then an electric kettle is a better option
And, finally, I'm invoking the law of conservation of energy. If the heater element in a "power shower" that heats the water on the fly scales up (and, according to you, somehow draws more power than ohms law permits) where does the extra energy go?If you have x litres a minute running through it and it is fed with water at - lets say 15C and produces water at 45 C it has to draw some defined amount of power.
Oh but I have. You seem to think that immersion heaters are not attached to the tank they are heating. Funny, then that the manufacturers build flanges into the tanks and fit the heaters with screw threads and nuts. OK, let's accept that on your planet the immersion heaters are fully immersed in the water and not attached to any metal object. So once again the ball is in your court: why does SE's breaker trip out when the heater needs descaling?