What’s the difference between the Air 2D and Air 4D RV diesel heaters?

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Question:

We’re torn between the 2D and 4D for our van. Is the 4D overkill, or worth it?

asked by: Sam

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Expert Reply:

Sam, the Air 2D # AU56MR heater is ideal for smaller vans, campers, and boats. It draws less fuel and power. But if your van is larger, or you’re heating multiple areas, the 4D # AU96MR heater gives you more airflow and faster warm-up. It also cycles less in cold conditions and is quieter at partial loads.

Think of the 4D as the bigger version with bigger lungs for more air to get through to you. It also performs at higher elevation.

For the small price difference, I'd lean towards the 4D if I were you. I don't know how many times I regretted just shelling out another $50 or $100 on something since in the long run it is more benefical.

expert reply by: Andrew N

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Answer 1

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Answer 2

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 3

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Answer 4

Hi Paul, you’re definitely on the right track here, and I can help you narrow this down with confidence. With your tandem 3,500 lb Dexter axles and 33 inch spacing, both the Dexter EZ Flex part #K71-652-00 and the Lippert Road Armor part #LC53CK are…

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Answer 5

Hey Bryan, that's a good question. The pricing can definitely be misleading, but I wouldn't use it to judge the quality of the tire. A lot of that comes down to promotions, inventory, and whether you're looking at a tire by itself or…

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Answer 6

The 5.30-12 tires, being wider, are going to make more contact with the road. This means that the noise, and heat build up will be higher than a 4.80-12 tire but the rolling resistance will actually be less because the tire is larger diameter. The…

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Answer 7

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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Answer 8

The two sizes you mentioned are pretty similar and fit many of the same 15 inch wheels. The 205/75-15 fits rim widths of 5 inch to 6 inch whereas the 225/75-15 fits widths that are 5 inch to 6-1/2 inch. The 205 is 27.1 inches tall and the 225 is 28.4…

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What’s the difference between the Air 2D and Air 4D RV diesel heaters?

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