Making an rv furnace quieter

I added the Cheapheat furnace system to our furnace. It uses a 5000 watt electric element for heat. It still uses the furnace fan which is not very noisy without the propane burner running. We love it and the comfort of the heat. You still have the option of running propane heat if you wish.

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Dutch_12078 wrote:
The majority of the sound from our two furnaces comes from the large cold air returns. I lined the area behind the grills with a sound absorbent material, and even blocked off a section of the over sized grill with the same material, being careful to still exceed the manufacturer's required minimum opening area and minimize restricting air flow. The sound level reductions were significant, although I didn't take any before/after measurements.

Instructions for the mod Dutch made can be found here: Soundproofing a noisy furnace

So for both Buddy and Olympian you need to open a window to vent?
Is there any other option for a quieter and more efficient propane heater?
My furnace is loud and seems to suck up propane real fast.

fncampn wrote:

Dutch_12078 wrote:
The majority of the sound from our two furnaces comes from the large cold air returns. I lined the area behind the grills with a sound absorbent material, and even blocked off a section of the over sized grill with the same material, being careful to still exceed the manufacturer's required minimum opening area and minimize restricting air flow. The sound level reductions were significant, although I didn't take any before/after measurements.

Instructions for the mod Dutch made can be found here: Soundproofing a noisy furnace

For "Sound Absorbent Material" for this mod, I would use acoustic foam panels readily available on-line and elsewhere. They are usually egg-crate, pyramid, or ridged foam panels about an inch thick. Make sure they're flame proof. They are amazing at absorbing sounds, particularly at the frequency of most fans. You can glue them to the inside of the furnace cabinet, of course keeping away from the actual furnace.

If your cold-air grate has the typical 10" x 20" opening (200 square inches) and your furnace requires the typical 80 square inches of return air area (see the manual for your furnace), then I would use an acoustic foam panel to block half of the cold-air grate, which allows about 10" x 10" or 100 square inches.

wopachop wrote:
So for both Buddy and Olympian you need to open a window to vent?
Is there any other option for a quieter and more efficient propane heater?
My furnace is loud and seems to suck up propane real fast.

In my unedumacated terms:

Not to “vent” combustion (rapid oxidation) but to provide a supply of oxygen. I do not have chemistry credentials so dare not be too specific, but these types of heaters are a “catalytic converters” using O to convert the C and H in propane into C02 and H2O. Radiant heat is the quiet by product. Water vapour is a by product that has to be managed. High fuel efficiency is also a benefit.

Keep in mind radiant heat warms people and materials in a steady manner not air blowing about. Think warming a rock with the sun or a hair dryer...

Radiant heat travels in straight lines, but if you leave it alone it warms the partition wall and then the closet behind and so on.

A bit of venting management is a fair trade for the comfort.

I can place my CO monitor above my Big Buddy heater at start up or running reading = O. Not so above you propane stove or furnace exhaust.

The rv furnace is excellent in cold rainy weather because heating air quickly reduces the clammy humidity. In cold dry weather (desert winter nights) radiant heat and the comfort of warm materials around you is nice.

If you like to throttle heat up and down all the time hot air blowers are a better choice.

gwalter wrote:
I added the Cheapheat furnace system to our furnace. It uses a 5000 watt electric element for heat. It still uses the furnace fan which is not very noisy without the propane burner running. We love it and the comfort of the heat. You still have the option of running propane heat if you wish.

Link

X2

Safer than electric space heaters and catalytic gas heaters. speaking of possible hot surfaces, and heavy current draw on minimal electrical wiring, in addition catalytic place large amounts of additional moisture in the RV, causing condensation. My dad was a Firefighter and saw way too many fires caused by space heaters, and deaths from depleted oxygen.
That and space heaters do nothing for keeping the basements warm.

I currently have our Cheap Heat system stepped down to 1,800 watts as we are on a 30 amp service, we have gotten down to the low 40's and it still keeps us warm, just needs to run longer.

The only issue I have with it is, if one runs on electric for an extended period, the first time you switch back to gas, is the stink of burning dust off the heat exchanger.

A few years ago, I blocked the heater opening off, cut out some cabinet walls (under the drawers), and placed a grill opening a few feet away from the furnace. The air flow was still very adequate and the furnace fan noise was quieter.
Another trailer, I placed two insulation baffles between the opening and the living area. The air flow had to weave around the baffles somewhat---very nice.
Currently, I'm still scratching my head about this trailer.....