S8 Elite vs. Goodknight 420G for travel

JPZeller · Post by **JPZeller** » Fri Feb 10, 2006 7:28 am

Hi - I am looking for a light and small travel machine (not to use on the plane, but to carry on for use in the hotel). I was sold on the 420G (1.75 lb), but a DME pointed out that the S8 Elite is more machine (Auto on/off, exhalation assist) and only weighs 1.15 lb more. Seems slightly larger. Price difference isn't an issue.

Any recommendations out there?

Thanks in advance.

WillSucceed · Post by **WillSucceed** » Fri Feb 10, 2006 8:46 am

If you are wanting an auto machine, look at the 420E (rather than the G)
The 420E is the same size and weight as the G, but it is auto.
I have travelled alot with my 420E and H2O humidifier -both have been great!. Small, lightweight, easy to manage.

Regarding the exhalation relief in the S8, you might want to check into this. I believe that it does NOT function in auto mode.

wading thru the muck! · Post by **wading thru the muck!** » Fri Feb 10, 2006 8:56 am

JPZ,

Are you planning to use a heated humidifier? If you are, get the S8. If not, either one would be great... but the PB420 is VERY packable.

JPZeller · Post by **JPZeller** » Fri Feb 10, 2006 8:57 am

Thanks, Will and Wading. Am not interested in AutoPAP, but I do like the "auto on" feature.

wading thru the muck! · Post by **wading thru the muck!** » Fri Feb 10, 2006 9:03 am

JPZeller wrote:... but I do like the "auto on" feature.

Then, I'd get the S8... you'll find it's a very solid machine.

Ergin · Post by **Ergin** » Fri Feb 10, 2006 10:27 pm

Stay away from S8 because its DC circuit is flawed and you'll have to buy
and carry around the mysterious RESMED DC-DC converter.
Despite the small size it is twice as heavy as 420 too.

WilsonVilleUSA · Post by **WilsonVilleUSA** » Sat Feb 11, 2006 4:40 am

I have the 420G for travel use (Remstar Auto w/C-Flex for home)

I looked at the S8 as well, the 420 is smaller, lighter and also a nice "normal" shape.

Power options were a concern for me, I do Motorcycle Touring and wanted something that could be 12v powered from my bike. PB seemed like a better choice for this as well. I heard lots of bad things about using the Resmed models on 12v power.

Auto on isn't a big deal to me, how hard is it to push a button?

Wayne

wading thru the muck! · Post by **wading thru the muck!** » Sat Feb 11, 2006 11:53 am

Ergin wrote:Stay away from S8 because its DC circuit is flawed and you'll have to buy
and carry around the mysterious RESMED DC-DC converter.
Despite the small size it is twice as heavy as 420 too.

This is only a concern if you are intending to use a DC power source. Most travelers would be plugging into a standard AC outlet.

I'll agree that it is heavier thatn the 420, but the trade off is that if you are using a Heated Humidifier, the S8 combo is much more compact than the 420 with it's integrated HH.

You might also look at the Everest (Aura) cpap. it is also very compact.

dsm · Post by **dsm** » Sat Feb 11, 2006 6:37 pm

[quote="Ergin"]Stay away from S8 because its DC circuit is flawed and you'll have to buy
and carry around the mysterious RESMED DC-DC converter.
Despite the small size it is twice as heavy as 420 too.

Guest · Post by **Guest** » Sat Feb 11, 2006 8:28 pm

Ergin wrote:There is a design error with dc input on all s8 series machines.
You cannot use them directly from 12V, otherwise it will blow up as
mentioned by cpap.com.

Instead of buying RESMED convertor at a ridicilus price (the converter
converts 12V DC to 12V DC by the way ) you can buy 12V DC-110V AC
converter at a much lower price and can use it for other devices too.

Guest · Post by **Guest** » Sat Feb 11, 2006 8:31 pm

WNJ wrote:
Ergin wrote:. . . you can buy 12V DC-110V AC
converter at a much lower price and can use it for other devices too.
True, but for RESMED S8 it needs to be a pure sine wave inverter, otherwise you will kill the S8.

This is one of the principal reasons I chose a REMstar Auto instead of the S8.

Wayne

Dr Facts · Post by **Dr Facts** » Sun Feb 12, 2006 12:24 am

Is it reasonable to ask how many people intend running their xPAP of a DC Invertor ?

Most doing so *only* do it so they can run the h/h as well. If ResMed say they have a pure sinewave invertor then whats the problem ?.

The S8 runs *perfectly* off 12V. Just as well as most other brands.

To publish scare campaigns about brands of xPaps in public forums without clear explanations smacks of marketing sabotage.

Thanks

Lyn · Post by **Lyn** » Sun Feb 12, 2006 12:43 am

Ergin wrote:Stay away from S8 because its DC circuit is flawed and you'll have to buy
and carry around the mysterious RESMED DC-DC converter.
Despite the small size it is twice as heavy as 420 too.

I may be wrong, but I believe that there is less than 1 pound difference in the weight of the 2 machines & their h/h.

Guest · Post by **Guest** » Sun Feb 12, 2006 1:07 am

From cpap.com:

A Resmed DC-12 Converter For S8 Machines must be used with the 12 volt jack. Any other cable will likely cause a machine failure.

This humidifier cannot be run off 12 volt power. If a machine is powered by 12 volts, the heated humidifier will not run. If a cpap is powered by 110 or 220 volts it will power the heated humidifier. A 110 volt pure sine wave inverter hooked to a 12 volt battery can be used to power a machine and this humidifier.

Weight

ResMed S8---Machine: 2.9 lbs.
Humidifier Docking Station and Unfilled Water Chamber 1.5 lbs.
Total: 4.4 lbs.

PB420e----Machine: 1.54 lbs.
Humidifier Weight (when empty): 1.76 lbs.
Total: 3.3 lbs.

Ergin · Post by **Ergin** » Sun Feb 12, 2006 1:16 am

Dr Facts wrote:Is it reasonable to ask how many people intend running their xPAP of a DC Invertor ?

Most doing so *only* do it so they can run the h/h as well. If ResMed say they have a pure sinewave invertor then whats the problem ?.

The S8 runs *perfectly* off 12V. Just as well as most other brands.

To publish scare campaigns about brands of xPaps in public forums without clear explanations smacks of marketing sabotage.

Dr facts, I am not trying to sabotage anybody, I am trying inform others
so that they won't do the same mistake as I did.
If there is a problem with the design of S8 series, RESMED should blame
their engineers for it, not the upset users.

Here is the quote about the mysterious "DC-12 Converter" from cpap.com :
"This is the only product that you should use to power the S8 machines from a DC source. Other cables may fit but will blow out the S8 power supply (no kidding, we have found out the hard way). The polarity is different from most 12 volt cables and the converter provides needed power smoothing."

https://www.cpap.com/productpage/DC-12-Converter.html

S8 Elite vs. Goodknight 420G for travel

S8 Elite vs. Goodknight 420G for travel

Scare campaigns

Re: Scare campaigns

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