Saw a handful of these on discount at WW in Bondi Jct (NSW), but couldn't find any info on them. Anyone knows whether they're quiet and efficient?
Adesso Ceramic Heater 30% off for $14 @ Woolworths
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That's what I went there for, but they only had one left, and it was for single bed.
heated throw is always single size … as a top blanket
not to be confused with heated underblanket which goes under your bedsheet
Ah,true. I went for the the fitted underblank, but there were no throws left either.
Anyone knows whether they're quiet and efficient?
I don't know about quiet, but when converting electrical energy (not using an exchanger, etc.) to heat the efficiency generally approaches 100%; watts in = watts out.
Came to day this. I'll take an "inefficient" ie high power use heater any day. Is there such a thing as inefficient heaters?
Sure, ones that only heat up themselves, not the room they're supposed to. For instance, imagine a heater inside a closed heat-resistant plastic container with no ventilation. It'd be like a reverse refrigerator, and would be as efficient a heater as refrigerators are in cooling your house.
Heat has to go somewhere - you can't "lose" it as such. Some heaters might be great at directing hot air, others at raising the ambient temperature in a closed room.
I think "efficiency" was not the best choice of expression in your original question. Maybe ask about other specific operational matters or present your own requirements for comment.
@thevofa: What do you buy a heater for? To heat the room, no? An efficient heater is one that heats up the room with little energy consumption. Same definition one would apply to a refrigerator.
All heaters of a given power will eventually heat up a room the same unless something else is talking the heat. Some might be great at putting under the desk and heating your legs in the process, others might be better shining down from the ceiling such as in the bathroom.
Again, define your specific requirements for a sensible answer.
Sure, in that example you're right.
But where does the heat go when you open the box? Alternatively, it leaks out eventually, you cant have a perfect thermal insulator.
Sure, the heater would be ineffective (not heating the room at the rate or at the time you wanted heat), but this doesnt make it inefficient.To my knowledge there is no heater which remotely functions this way.
So I think the answer to is there such a thing as inefficient heaters is - no, not in production, but building ineffective heaters is possible.
Focused direct heat, dispersed heat, using for 5 minutes in the morning, using for hours in the evening.
Bar heaters for the former, perhaps bar or oil heaters for the latter.Gas heaters for either if you have gas.
I use a bar heater with one broken ceramic filament because I am a dangerous man living close to the edge.
Sure, the heater would be ineffective (not heating the room at the rate or at the time you wanted heat), but this doesnt make it inefficient.
@ozbjunkie: You do realise efficiency = effectiveness / cost, no? A less effective heater is obviously less efficient than a more effective one with the same energy consumption.
No I recognise efficiency is a ratio of heat energy out / electrical energy in. Perfectly efficient heaters would have a ratio of 1. Fan heaters, for example, obviously less than 1 because they make sound and some kinetic energy goes into the blades.
Am I wrong in my thinking?
Yes, @ozbjunkie, you are. The purpose of a heater is not simply to produce heat, but to heat something, be it a room, an outdoor area, a swimming pool, whatever. If efficient transmission of the heat weren't a consideration, there wouldn't be various designs aiming to maximise it for the same wattage consumption: fans, oscillators, long panels, etc.
Ozbjunkie is taking a sensible and communicable approach to the question.
You do realise efficiency = effectiveness / cost, no?
Fine, but the issue remains that you're not giving a strict definition of effectiveness. It's like you're asking if Toyota's provide a good ride; it's open ended.
Actually I gave a textbook definition of power efficiency.
Fans don't maximise room heating. They make heating directional. As in my comment that no, the purpose of all heaters is not to "heat the room". Outdoor heaters are a good example of this idea.
Where's your definition of efficiency come from?
Mine is the same used for refrigerators, @ozbjunkie; most effective with least consumption. If the purpose of a particular heater is to heat a room, it's efficiency is measured by what it consumes to do just that.
But the purpose of heaters is not always to heat an entire room.
Refrigerators also operate differently to heaters, in that they increase the temperature differential between the space inside and outside the device. Heaters do not have this objective.
Regardless, using your equation you should be suggesting gas heaters, as the factor of cost will be smaller.
By the way, you can press the reply button and people will see you have commented. No alerts given otherwise.
Technically a dehumidifier is about 1:3 for heating.
I'm pretty sure it converts close to 100% of the electricity to heat with a bit to light but how efficiently it conveys the heat to you I don't know.
but how efficiently it conveys the heat to you I don't know
Yup, that's the question. A heater that only heats itself up, not the room it's supposed to, is pretty useless.
What heater only heats itself? Dont they all heat themselves to some extent and then transmit that heat to the rest of the room?
Anyone knows whether they're quiet and efficient?
Compared to what? Provided your above 5C outside (non-portable) aircon is 200-400% efficient.
Compared to comparable products, obviously.
I love them, bought two last year for the kids' rooms and another two to give to my sisters. They were very happy with them and even bought more. It has two settings, the first setting is warm enough for one small to medium sized room, very rarely we have them on the second setting.
Are they quiet?
It's not quiet, but not too loud either. I actually prefer it this way, because my son sometimes uses it unnecessarily, I want to keep the electricity bill as low as possible
Can you turn it on without the fan?
I have this one, and it's super noisy. This is the one I'm looking to replace, as I reckon it's waking up the baby during the night when the thermostat turns it on, and move it to the bathroom.
I got the kmart one. It is super noisy indeed. I used it initally to mask noise from outside. Now I cant sleep without it running in the background.
But besides the noise, they do work, and Kmart does offer unbeatable prices and quality at the low end.
That looks like the other one I have, and indeed is both effective and quiet, since the fan is separately controlled from the heat (not sure about its consumption, though, as I haven't measured it). But unfortunately it's not baby friendly. Right now I'm using the $15 Kmart one, sitting on top of a shelf, out of reach, but it's very noisy when it turns itself on, fan and all.
Ideally you would want it lower down, the coldest air is going to stay in the bottom half of the room and the heat is going to just circulate around the ceiling.
Got the Kambrook Oscillating for $42 (Promo) from Woolies. Used Adesso in the past and they have barely lasted a few months. Not noisy, just not as efficient.
I got one of these last year.
Its an excellent heater for $20 !
Since its fan forced, it heats up an entire bathroom within minutes
And since its ceramic, its much more efficient that those old skool hot-wire style heaters from Kmart.since its ceramic, its much more efficient that those old skool hot-wire style heaters
Why is that?
Also: is it quiet?
better get the jason heated throw at 25 if you still can find any stock