5391A Suburban ST-42 ON DEMAND RV Water Heater, NEEDS S6285 DOOR

OEM Tankless / On‑Demand RV Water Heater — Requires Door S6285

Replaces 5381A

The 5391A is Suburban’s ST‑42 On‑Demand (tankless) water heater, engineered to deliver continuous hot water output for RV applications. This model replaces traditional 6‑ and 10‑gallon tank heaters with a high‑efficiency, on‑demand system that heats water only when needed.

The Suburban ST‑42 is a high‑output, on‑demand tankless water heater designed for modern RVs requiring continuous hot water. Unlike tank‑style heaters, the ST‑42 heats water instantly as it flows through the system, eliminating recovery time and maximizing efficiency.

This model requires the S6285 door kit for proper exterior installation and ventilation.

📐 Key Features

• OEM Suburban ST‑42 On‑Demand water heater

• Provides continuous hot water — no tank, no recovery time

• High‑efficiency burner system

• Compact design for RV retrofits and OEM installs

• Requires S6285 exterior door kit for installation

• Direct replacement for older Suburban tank‑style heaters (with proper retrofit door)

• Suitable for a wide range of RV applications