5 signs your RV water heater needs replacement (not repair)
Most water heater problems in Port St. Lucie are repairable - failed thermocouples, burned-out elements, and clogged anode rods. But when you see these patterns, repair is throwing money at a unit that's headed to the dumpster anyway:
- The tank itself is leaking (water dripping from the bottom seam, not the relief valve). Once a Suburban or Atwood tank corrodes through, there's no patch. Replace.
- You've already replaced the element + thermostat in the last 3 years and it's failing again. Multiple element failures usually mean the tank lining is gone and the element is corroding faster than normal.
- The water heater is 12+ years old in PSL conditions. The compounding effect of hard water + heat + salt air means a unit that's still working at year 12 is on borrowed time.
- The anode rod is fully consumed in under 18 months (Suburban only - Atwood has aluminum tanks with no anode). When the anode disappears that fast, the tank is the next thing to corrode.
- You want to switch to tankless for endless hot water. Truma AquaGo or Girard tankless converts a 6-gallon-then-cold-shower setup into 60-min continuous hot water. About $1,200-1,400 installed.
What does an RV water heater replacement cost in Port St. Lucie?
Depends on the unit, the brand, and whether you're swapping like-for-like or upgrading. Real numbers we quote on mobile installs across Port St. Lucie and the Treasure Coast:
| Replacement | Unit Cost | Labor | All-In |
|---|---|---|---|
| Suburban SW6DE 6-gal gas/electric | $420-520 | $320-420 | $850-1,050 |
| Atwood G6A 6-gal gas only | $340-420 | $280-360 | $680-850 |
| Atwood GC6AA-10E 10-gal gas/electric | $520-650 | $340-440 | $960-1,200 |
| Truma AquaGo Comfort tankless | $880-980 | $420-500 | $1,300-1,500 |
| Girard 2GWHAM tankless (RVer favorite) | $680-780 | $420-500 | $1,100-1,300 |
All numbers include on-site mobile install in PSL or anywhere in St. Lucie/Martin/Indian River counties. We strip the old unit, prep the cabinet/wall opening, install the new unit with proper venting, run a leak test, and full cycle on both gas and electric (if applicable) before we leave.
Why Florida well water kills RV water heaters faster
Port St. Lucie sits on the Floridan aquifer. Most municipal and private well water around here runs 200-400 ppm in hardness, which is well above the 60-120 ppm 'moderate' range. That mineral content has three effects on your water heater:
- Anode rod consumption (Suburban only): the anode sacrificially corrodes to protect the tank. Hard water eats it 2-3x faster than soft water. Check yours annually.
- Element scale buildup: heating elements get a calcium crust that insulates them from the water, makes them run hotter, and shortens lifespan. Replace every 4-5 years instead of 6-8.
- Sediment accumulation in the tank: minerals settle at the bottom and reduce effective capacity. A 6-gallon tank with 1 inch of sediment is now a 5-gallon tank with longer recovery times.
We recommend an annual flush and anode inspection on Suburban tanks for PSL coaches. Atwood/Dometic aluminum tanks don't have an anode but still benefit from a yearly sediment flush. The flush takes 20 minutes and is $120-160 standalone (free if combined with another service call).
Repair-worth vs replace-now decision chart
When we're on-site in Port St. Lucie diagnosing a water heater issue, this is roughly how we walk the owner through the decision:
| Situation | Recommend | Cost |
|---|---|---|
| Unit under 5 yrs, single failure | Repair | $165-285 |
| Unit 5-9 yrs, first failure | Repair | $165-285 |
| Unit 5-9 yrs, second failure within 2 yrs | Repair but plan replacement | $165-285 now, budget $850+ |
| Unit 10+ yrs, any failure | Replace | $680-1,200 |
| Tank itself leaking (any age) | Replace immediately | $680-1,400 |
| Wanting tankless upgrade | Replace with Truma/Girard | $1,100-1,500 |
Tankless conversion - worth it for PSL RVers?
About 1 in 4 of our water heater jobs in Port St. Lucie is a tankless conversion now. Two main reasons people switch:
- Endless hot water. A 6-gallon tank gives you maybe a 5-minute shower before it's lukewarm. Truma AquaGo or Girard tankless gives you 60+ minutes of continuous hot water if you have the flow rate.
- Weight savings. A loaded 6-gallon tank weighs ~50 lb. Tankless units weigh ~12 lb dry, so you save ~40 lb. Matters on Class B and B+ coaches where payload is tight.
Tradeoffs to know: tankless units need a higher water flow rate to fire (about 1.0 GPM minimum), so your pump has to be in good shape. They also need 12V power even on gas mode for the igniter and water flow sensor. And they're more sensitive to mineral buildup - the heat exchanger needs descaling every 18-24 months in Florida hard water. Plan on a $145-185 descale service every couple of years.