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From: Norm of Bandersnatch (no email)
Date: Sat Feb 10 2007 - 12:02:22 EST
So the ceramic heaters main advantage is temperature modulating heating
element which I don't quite understand as an advantage as long as the fan
keeps going, and high volume fan (with subsiquent noise) to keep the output
temp down by increasing air volume.
I suppose that if the fan should slow down or fail the ceramic heater's
elements would shut almost all the current off to maintain the specified
element temp.
The wire element units have a temperature fuse in them to shut down the
heat elements in case of fan failure.
I'd bet the ceramic heaters have a heat fuse in them too, probably a
blanket rule for space heaters.
I suppose the main advantage to the ceramic element units is longer heater
element life.
I guess you pays your money and takes your choice.
Norm
S/V Bandersnatch
Lying 30 07.715N 081 38.394W
Julington Creek Estuary FL
> [Original Message]
> From: < ()>
> To: <>
> Date: 2/7/2007 5:37:33 PM
> Subject: lv-ab: RE: Re: ceramic Heaters
>
> > I think safety is the same for the ceramic or wire heater types since
> > they both output 1500 watts from a small source thus both have similar
> > output>
>
> > The ceramic ones seem to offer nothing
> > special but high price,
>
> Actually they do offer special features.
>
> First, true ceramic heaters do not have elements that heat up enough to
> ignite. They use the ability to move mass amounts of air across them to
> distribute lots of lower temp air then cheap units which move less air
> of much higher temps.
>
> The design of true ceramic heaters is that as the temperature of the
> unit increases the ability to output heat decreases. Sounds funny, but
> it means that as the elements heat up the resistors decrease the
> current. This is why true ceramic heaters have strong, high revving fans
> (and why some do not like them because of the noise). Lots of air blown
> through them keep the elements warm instead of hot. If the air flow is
> obstructed, the elements heat up more and the current drops accordingly.
>
> The first time I saw these units was at a boat show where they had a
> couple running full blast - lots of warm air coming out. But pushed
> through the grate were a couple of long kitchen matches, the kind with
> the big phosphorus heads with the white tips. (I used to light such by
> flicking my thumbnail across the tip). Those tips were right up against
> the elements, all day long, each day. They never ignited.
>
> That is why I like true ceramic heaters, and why they cost so much vs
> the cheap imitators. (I bought two that day at about $85 each and they
> lasted 10 yrs). The kind I buy have circular heating elements, each
> about the size of a half dollar coin, clustered together in a group of
> 3, 4, or five, depending on the wattage.
>
> Stephen
>
>
>
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