Suburban install for like-for-like replacement is straightforward; cross-brand replacement (Atwood to Suburban) requires modifications because cutouts differ.
Cutout dimensions
| Model | Cutout (W × H) | Depth |
|---|---|---|
| SW6 / SAW6 | 16" × 12-7/8" | 17-3/16" |
| SW10 / SAW10 | 16" × 12-7/8" | 19-1/2" |
| SW12 | 20" × 12-7/8" | 22-1/4" |
| SW16DEL | 20" × 14-13/16" | 23" |
Gas line
- 3/8" copper or approved flex line from LP regulator
- Standard RV LP fittings; Teflon tape rated for gas
- Shutoff valve in line accessible from outside
Electrical (DE models)
- 120V AC connection to RV converter or shore power
- 15A breaker dedicated
- 12V DC for DSI ignition (from RV house battery system)
Bypass valves
Install or verify existing bypass valves on inlet, outlet, and a connecting line between them. Allows winterization without filling the tank with antifreeze.
Seal and weatherproof
- Apply RV-grade silicone or putty tape around the flange
- Verify tight seal to prevent water intrusion behind the unit
- Re-seal annually if exposed to high UV
Bottom line
Like-for-like Suburban replacement: 1-2 hours DIY for an experienced RV owner. Cross-brand (Atwood→Suburban) requires cutout modification and is typically RV-shop work.