Most RV water heaters hold only 6-10 gallons, which means they run out of hot water much faster than home units. What catches new owners off guard is recovery time — how long it takes to reheat a fresh tank of cold water. A typical RV propane water heater needs 15-20 minutes to fully recover, while electric-only units can take 45 minutes or longer.
This is where combination gas/electric water heaters shine, though many owners never learn to use them properly. Running both propane and electric simultaneously cuts recovery time nearly in half and maintains consistent temperature during heavy use periods. The electric element keeps the water warm overnight while you’re plugged in, then the propane kicks in for faster recovery when you’re actually using hot water.
The trick is understanding when to switch modes. Electric-only works fine for light use and overnight heating when you have shore power. Propane-only is essential when boondocking. But for situations like multiple showers back-to-back or doing dishes after cooking, turning on both elements prevents that frustrating wait between uses.
Many owners assume running both is wasteful, but the opposite is often true. Faster recovery means less total energy used because you’re not repeatedly reheating partially cooled water. Check your water heater’s manual — if it has both connections and separate switches, you’re likely underusing a feature that could eliminate most hot water shortage problems.