Water Heater Operable But Water Is Only Getting Warm Not Hot

Updated 12/15/2025 | Published 12/03/2025

Question:

Water heater operable but water only getting like warm… 2009 jay o jay flight trailer Thanks!!!

asked by: Stacy

Expert Reply:

Hey Stacy, thanks for reaching out. If the heater fires up but you’re only getting lukewarm water, the first thing to check is the bypass setup behind the water heater. If those valves aren’t fully back in the “normal” position after winterizing, cold water sneaks into the hot line and knocks the temperature down. Same deal with the outside shower, if the hot and cold knobs out there are open but the sprayer is off, it mixes the water and everything inside turns lukewarm. Happens all the time.

After that, look at the heater itself. A weak electric element or a lazy propane burner can heat, just not hot. Mineral buildup in the tank can do it too. None of this is unusual on a 2009 Jay Flight, and most of it’s an easy fix once you spot the cause.

expert reply by: Jesse M