The RV Surplus — Resource Center
RV Furnace Crossover Chart
Not sure which furnace or replacement core fits your RV? Find your original model number below and we'll show you exactly what it crosses over to — for both Suburban and Dometic/Atwood brands.
Suburban Furnace Core Replacement Modules
Suburban's core replacement modules slide directly into your existing furnace cabinet — no ductwork, no cabinet removal, no hassle. Match your original model number below to find the right core, then shop it directly on our site.
Low-profile ducted furnaces (7½" high). Optional exterior access door with side/rear gas & electrical connections. 20K–40K BTU range.
| Current Model | Orig. Part # | BTU | Repl. Core # | Model | Type | Shop | |
|---|---|---|---|---|---|---|---|
SF-20SF-20QSF-Q (2552A)
|
2512A2386A
|
20,000 BTU20K | → | 2605A |
RP-20Q |
Ducted | |
SF-25QSF-30QSF-Q (2556A)SF-Q (2559A)
|
2516A2519A2387A2388A
|
25,000–30,000 BTU25–30K | → | 2607A |
RP-30Q |
Ducted | |
SF-35QSF-42QSF-Q (2564A)
|
2524A2527A2398A2399A
|
35,000–40,000 BTU35–40K | → | 2609A |
RP-35Q |
Ducted |
Interior-service low-profile ducted furnaces (7½" high). Front inside gas connection — optional exterior access door. Great for flush-wall installs.
| Current Model | Orig. Part # | BTU | Repl. Core # | Model | Type | Shop | |
|---|---|---|---|---|---|---|---|
SF-20FSF-20FQSF-FQ (2551A)
|
2511A2389A
|
20,000 BTU20K | → | 2606A |
RP-20FQ |
Ducted | |
SF-25FSF-25FQSF-30FSF-30FQSF-FQ (2555A)SF-FQ (2558A)
|
2515A2518A2390A2391A
|
25,000–30,000 BTU25–30K | → | 2608A |
RP-30FQ |
Ducted | |
F-42FSF-35FSF-35FQSF-42FQSF-FQ (2563A)
|
2523A2526A2400A2401A
|
35,000–40,000 BTU35–40K | → | 2610A |
RP-35FQ |
Ducted |
Compact, lightweight furnaces for smaller RVs, trailers, truck campers & pop-ups. NT-SQ is ducted; NT-SEQ is direct-discharge with optional side duct.
| Current Model | Orig. Part # | BTU | Repl. Core # | Model | Type | Shop | |
|---|---|---|---|---|---|---|---|
NT-16SQNT-20SQ
|
2444A2450A
|
16,000–19,000 BTU16–19K | → | 2611A |
RP-16NQ |
Ducted | |
NT-16SEQ (White)NT-16SEQ (Black)NT-20SEQ (White)NT-20SEQ (Black)NT-SEQ
|
2503APW2503ABK2504APW2504ABK
|
16,000–19,000 BTU16–19K | → | 2612A |
RP-16NEQ |
Direct Discharge |
High-capacity 12V DC ducted furnaces (NT) and 120V AC park model furnaces (P-40). Uniform cabinet sizing makes installation straightforward.
| Current Model | Orig. Part # | BTU | Repl. Core # | Model | Type | Shop | |
|---|---|---|---|---|---|---|---|
NT-30SPNT-34SP
|
2453A2454A
|
30,000–34,000 BTU30–34K | → | 2613A |
RP-30N |
Ducted · 12V | |
NT-40 |
2455A |
40,000 BTU40K | → | 2614A |
RP-40N |
Ducted · 12V | |
P-40P-40 (2456A)
|
2456A |
40,000 BTU40K | → | 2615A |
RP-40P |
Park · 120V |
Contact our team with your furnace label info and we'll confirm the right part.
Dometic / Atwood HydroFlame — Full Model Crossover
Dometic acquired Atwood and continued the HydroFlame furnace line under new model names. Legacy Atwood 79-series, 85-series, and 89-series units map directly to the Dometic AF-series, and then to the current DF-series "Mojave" line. Use this chart to find the current Dometic equivalent for any Atwood or older HydroFlame furnace.
🔑 How to Read a Dometic AF / DF Model Number
Prefix — Generation
Size Class
BTU (in model number)
3-Digit Config Suffix
Common in tent campers, truck campers, small trailers, and van conversions. The 7900-series HydroFlame furnaces (7912, 7916, 7920) are the primary legacy models in this class.
| Legacy Model | Gen. | BTU | AF Series | DF Mojave | Configs | Shop | ||
|---|---|---|---|---|---|---|---|---|
7912-IIHF 7912
|
Legacy | 12,000 BTU12K | → | AFSD12 |
→ | DFSD12___
|
111121131141
|
|
7916-IIHF 7916
|
Legacy | 16,000 BTU16K | → | AFSD16 |
→ | DFSD16___
|
111121131141
|
|
7920-IIHF 7920
|
Legacy | 18,000 BTU18K | → | AFSD20 |
→ | DFSD20___
|
111121131141
|
The 85-series (I through IV) and 89-series DC furnaces are the most frequently replaced Atwood units. They cross directly to the AF-MD and then DF-MD Mojave line by BTU size.
| Legacy Model | Gen. | BTU | AF Series | DF Mojave | Configs | Shop | ||
|---|---|---|---|---|---|---|---|---|
85-I 1685-II 1685-III 1685-IV 168516-IV
|
85-Series | 16,000 BTU16K | → | AFMD16 |
→ | DFMD16___
|
111121131141
|
|
85-I 2085-II 2085-III 2085-IV 208520-IV8525
|
85-Series | 20,000 BTU20K | → | AFMD20 |
→ | DFMD20___
|
111121131141
|
|
85-I 2585-II 2585-III 2585-IV 258525-IV
|
85-Series | 25,000 BTU25K | → | AFMD25 |
→ | DFMD25___
|
111121131141
|
|
85-I 3185-II 3185-III 3185-IV 318531-IV89-I DC89-II DC89-III DC
|
85/89-Series | 30,000 BTU30K | → | AFMD30 |
→ | DFMD30___
|
111121131141151
|
|
85-I 3585-II 3585-III 3585-IV 358535-IV89358940
|
85/89-Series | 35,000 BTU35K | → | AFMD35 |
→ | DFMD35___
|
111121131141151
|
High-capacity large-format furnaces used in larger motorhomes and coaches. 9" cabinet height — measure your existing opening before ordering.
| Legacy Model | Gen. | BTU | AF Series | DF Mojave | Configs | Shop | ||
|---|---|---|---|---|---|---|---|---|
AFLD35AFMD40
|
AF-Era | 35,000–40,000 BTU35–40K | → | AFLD (series) |
→ | DFLD40___
|
111121
|
Once you know your base Dometic model (e.g. DFMD30), the 3-digit suffix tells you which physical variant to order. Match it to your existing install.
| Suffix | Access Door | Description | Best For |
|---|---|---|---|
| 111 | Required | Standard — requires exterior access door | Most common; direct replacement for door-accessible installs |
| 121 | None | Doorless — no exterior access door needed | Interior-service installs; cleaner exterior appearance |
131141151
|
Required | Alternate duct port orientations | Use when existing ductwork requires a different port placement |
Send us your furnace's model and serial number and we'll confirm the exact part.