happybuy diesel air heater

chessie4905 · December 02, 2021, 05:05:39 PM

Wonder if you came off heater with the 90 mm for about 3 or so feet and then add splitters for the other runs to reduce temp at heater outlet?

dtcerrato · December 02, 2021, 05:30:22 PM

Quote from: chessie4905 on December 02, 2021, 05:05:39 PM
Wonder if you came off heater with the 90 mm for about 3 or so feet and then add splitters for the other runs to reduce temp at heater outlet?

It would take modification of the 75mm discharge end. At any rate if you're trying to decrease temp at the heater outlet you're only going to superheat the duct itself down the line. The 2X2 AL box tube I showed in an earlier photo gets REAL HOT. With that being said the black flex duct with AL foil inner is extremely suitable for this kind of heat. IMHO

buswarrior · December 02, 2021, 05:54:54 PM

That's awfully hot.

Wasn't that book title "Fahrenheit 451" ?

Or your temp gun is likely very excited?

Be careful!!

Happy coaching!
Buswarrior

chessie4905 · December 02, 2021, 06:05:04 PM

I'm thinking how hot air heating is done in a house. Large main duct off furnace, then split off down the line some with smaller ducts. They do list a 90mm end on Alixpress.

dtcerrato · December 02, 2021, 06:56:27 PM

@BW
That heat temp was being read from the control monitor getting it's reading from the heat sensor. It's HOT fur sure!

@Chessie
Speaking of smaller ducts - the four 42mm set up is a pain to route but is nice to be able to go in all sorts of direction with a small easy to fit size.
Some of the biggest differences in my perspective with these types of heaters over the standard thermostatically controlled LP forced air furnaces are
1) The intensity of the high temp heat.
2) The constant run on a given setting - no cycling.
3) The heat after a long run time is so hot the heater can be set to it's lowest/slowest setting with barely a breeze coming out of the register in almost total silence & STILL keep the area warmly comfortable.

Can you tell I'm sold on these little gems?
Nothing primary just redundant back-up for an already comfortable LP forced air (two separate units) heated cabin.
I lean on the two CDHs now because of their extremely high efficiency with fuel & battery - great for boondocking!

DoubleEagle · December 02, 2021, 08:35:37 PM

This has been an excellent discussion, and we did not even drift! Looks like it will be an excellent heat source as long as we don't burn the coach down.

451 is the temperature at which paper bursts into flame, thanks to Ray Bradbury.

dtcerrato · December 03, 2021, 02:56:28 AM

Keep in mind that 464F reading was at the combustion chamber. My heat gun reading is approx. 1/2 that at the hot air discharge. The air rush over the burn chamber keeps the whole unit - except for the very end outlet cool to the touch. It's understandable how a power brake shutdown has catastrophic results on the mother board control that sits in the cold air inlet but on top of the heat chamber.

sledhead · December 03, 2021, 05:23:29 AM

"an excellent heat source as long as we don't burn the coach down.

"

be carefull

dave

richard5933 · December 03, 2021, 05:47:12 AM

Anyone know how these very high air output temps compare to the output temps from a similar unit from Espar/Eberspacher?

chessie4905 · December 03, 2021, 05:48:28 AM

Yeah, the heat discharge of about 220 sounds similar to the house system at source after running a while.You need that to have any heat left at distant outlets. That constant heat is nice as I'm used to that with coal heat with oil as backup at home.

Jim Blackwood · December 03, 2021, 08:17:12 AM

The Eiberspacher/Webasto uses a water jacket, so heat output never goes much over boiling. On the exhaust side it's different of course, but that runs into the muffler.

Jim

buswarrior · December 03, 2021, 08:38:42 AM

Quote from: Jim Blackwood on December 03, 2021, 08:17:12 AM
The Eiberspacher/Webasto uses a water jacket, so heat output never goes much over boiling. On the exhaust side it's different of course, but that runs into the muffler.

Jim

The words "Webasto" "Espar" and all the rest, can't be used without qualifiers as to what kind of unit we're typing about.

A coolant boiler has a water jacket, and air heater does not.

These happybuy heaters are air heaters.

Happy coaching!
Buswarrior

chessie4905 · December 03, 2021, 08:45:59 AM

just checked. Alixpress has diesel fuelled
engine coolant heaters. Also decent priced. As Xmas gets closer, maybe some will offer free shipping

Dave5Cs · December 03, 2021, 10:04:43 AM

could you put heat exhaust wrap around the length of the exhaust pipe and muffler to make it a little more safe like we do on our exhaust pipes in the bus to let the engine compartments cool a little?

Bearmtnmartin · December 03, 2021, 10:05:10 AM

I plan to buy this one in January. I cannot find any information or reviews at all so I will be the guinea pug I guess. I would have bought it already but I am waiting for free shipping for the 12 volt model. If anyone has experience with them please let me know. I have an old Wanderlodge with factory heat exchangers so it should be an easy install.

https://www.aliexpress.com/item/32965054367.html?spm=a2g0o.productlist.0.0.18353d5cLM6UAX&algo_pvid=4d76bd6e-3233-462c-95b8-59bbc34f6277&algo_exp_id=4d76bd6e-3233-462c-95b8-59bbc34f6277-0&pdp_ext_f=%7B%22sku_id%22%3A%2266609536148%22%7D