Propane furnace sending heat to outside vent
Hi, Running our Suburban propane furnace it seems like the unit is pushing as much (or more) heat out of it's exterior vent as it is to the interior vents. At the vents the flow is a gentle convect...
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And they are still using these 20K/30K inefficient furnaces in a 15-25' TT.
I am using a 20K propane fired space heater in my 22' trailer. This is the third small RV that the same heater has been used. There is a Class B vent stack that exits through the roof. The heater has a tile/masonry surround. It operates at 10 lbs line pressure regulated at the heater inlet to a lower pressure. It is basically a residential water heater sized burner in a steel can. I have piped combustion air and stack make up air to it from the outside.
When in use, I start the heater at medium -> high for 30 minutes or so and it heats the cabin rapidly. If at ambient 10f or above, the heater is then turned down to pilot only. If it gets really cold like I've experienced at deer camp, -15f or so, then after the 30 min. cycle the heater is set to just above pilot/low. At 10f, I will burn a 20 lb cylinder every four-five days. That includes the water heater and the range use.
I know the real vintage rigs had a radiant coil type heater and it did the job. I don't know their efficiency. It just seems like a better furnace/heater could be used in a smaller RV than the typical vented downdraft models. I also see a lot of folks complaining about 12V suckage and the noise of the blower.
I am using a 20K propane fired space heater in my 22' trailer. This is the third small RV that the same heater has been used. There is a Class B vent stack that exits through the roof. The heater has a tile/masonry surround. It operates at 10 lbs line pressure regulated at the heater inlet to a lower pressure. It is basically a residential water heater sized burner in a steel can. I have piped combustion air and stack make up air to it from the outside.
When in use, I start the heater at medium -> high for 30 minutes or so and it heats the cabin rapidly. If at ambient 10f or above, the heater is then turned down to pilot only. If it gets really cold like I've experienced at deer camp, -15f or so, then after the 30 min. cycle the heater is set to just above pilot/low. At 10f, I will burn a 20 lb cylinder every four-five days. That includes the water heater and the range use.
I know the real vintage rigs had a radiant coil type heater and it did the job. I don't know their efficiency. It just seems like a better furnace/heater could be used in a smaller RV than the typical vented downdraft models. I also see a lot of folks complaining about 12V suckage and the noise of the blower.
