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Open Roads Forum  >  Truck Campers

 > Espar type heater to replace older furnace.

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Kayteg1

California > Nevada

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Posted: 12/06/20 11:03am Link  |  Quote  |  Print  |  Notify Moderator

S Davis wrote:

HMS Beagle wrote:

On the other hand, no way a diesel Espar type is going to be 90%. To get into the 90s a heater has to be condensing, and they are not even close to that.


Getting 87% combustion efficiency is fairly normal on oil, there are even blueflame burners that are in the low 90% range that are non condensing.

Combustion efficiency doesn't mean much when you couple it with lousy heat exchanger.





S Davis

Western WA

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Posted: 12/06/20 11:32am Link  |  Quote  |  Print  |  Notify Moderator

Fuel has a given value so without burning it in a heat exchanger you can’t get combustion efficiency, all the test equipment I know of measures air temp in and out of the equipment as well as flue gas sampling for o2, c02, and co, so combustion efficiency takes into account the Individual heat exchangers.

HMS Beagle

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Posted: 12/06/20 04:54pm Link  |  Quote  |  Print  |  Notify Moderator

Efficiency of a furnace is Heat Out / Fuel In.

But thermal efficiency in an RV furnace is really not that important. More important may be noise, fuel availability, AH requirements, installation volume, among others. In my opinion an Espar/Webasto (or better still a Wallas) is a better option than the typical Rv furnace, held back by the need for a separate diesel tank when most RVs already have a propane system. Better even than that would be a Webasto or ITR hydronic, which solves the domestic hot water issue as well. Wallas even makes a diesel stove, you can get rid of the propane altogether.


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Photomike

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Posted: 12/06/20 08:47pm Link  |  Quote  |  Print  |  Notify Moderator

I have run both. Both have good and bad features, but I am leaning towards my Espar being better then the RV furnaces that I had. Now my Espar is located in my van so this will change a few things then a truck camper.

One of the GREAT benefits is the ability to run multiple ducts BUT even bigger for me is having a cold air return. I can take cold air from the coldest part of my vehicle and heat it. My RV furnaces all took air from the front of the furnace to heat and with them being a foot or two from the floor the floor was always cooler. Maybe other units had this ability but my two units did not.

I like that my Espar uses gas as it stays liquid in extreme cold better then the propane. I like only having one fuel to worry about in my van. Using one of the diesel units with separate fuel tank would work but I would be back to two fuels to make sure were topped up.

Inside noise I would say is a little quieter then the propane. Maybe half the noise on my worst RV propane unit and a quarter on the less noisy one I had in my RV.

BIG issue is the noise on the outside. The Epsar is like a CF-18 kicking in the afterburners when it fires. Does keep people from camping on that side of me. Maybe an issue if you run it in a campground.

Myself I would not put a duct in the cab over. Heat rises and it would get REALLY toasty up there.

A second thought would be a vented cat heater if you are looking for quiet.


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HMS Beagle

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Posted: 12/07/20 09:50am Link  |  Quote  |  Print  |  Notify Moderator

Propane RV furnaces with ducts are common. Cold air return is available, but less common.

The Espar/Webasto type heater can be VERY load outside. These heaters are common on boats in the PNW. The worst of them will keep the whole anchorage awake at night. The best sound about like a propane RV furnace. It depends somewhat on the installation, manufacturers offer mufflers for the exhaust.

Kayteg1

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Posted: 12/07/20 10:10am Link  |  Quote  |  Print  |  Notify Moderator

I had complains from campground neighbor that my water heater kept them awake.
Few years back we camp at RV park and 4 sites away there was pretty expensive Class A.
His furnace was so loud, that having no other RVs between would wake us up at night.
I talk to the owner and he said it was new RV with all warranties still valid and his service said the noise is normal for the type of furnace he had.
With diesel heater it is exhaust pipe that makes the noise.
That can be short or long, some of them come with muffler, so you can easy control it.

Kayteg1

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Posted: 12/07/20 03:28pm Link  |  Quote  |  Print  |  Notify Moderator

Somebody made those heaters portable in separate box.
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Photomike

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Posted: 12/07/20 06:30pm Link  |  Quote  |  Print  |  Notify Moderator

They do have mufflers for them. The diesels I have heard a lot of people say that the mufflers cause problems. Likewise high altitudes can cause issues without the high altitude kits.

Some of the newer diesel pushers use these as well. They can run the ones that preheats the engine or for air heat.

towpro

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Posted: 12/07/20 06:40pm Link  |  Quote  |  Print  |  Notify Moderator

we did just have a large 5er parked near us last month that the propane heater sounded like a jet engine running.
I also know a hot water heater can be noisy if the burner tube is not adjusted right.


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StirCrazy

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Posted: 12/07/20 06:50pm Link  |  Quote  |  Print  |  Notify Moderator

Photomike wrote:

They do have mufflers for them. The diesels I have heard a lot of people say that the mufflers cause problems. Likewise high altitudes can cause issues without the high altitude kits.

Some of the newer diesel pushers use these as well. They can run the ones that preheats the engine or for air heat.


is isnt the mufflers that are causing the issues if you use the straight through ones, but rather how they run the exhaust. that seams to be the biggest thing that causes issues in them is the exhaust and intake running.


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