---
title: "RV Water Heater Repair and Replacement in Yorba Linda"
description: "Suburban steel tanks, Atwood clad tanks, Truma AquaGo and Girard tankless units diagnosed and replaced. $350 to $4,500 at $260 per hour, LP checked on every job."
focus_keyword: "rv water heater replacement rancho santa margarita"
canonical: https://ocrv.me/services/plumbing-repair/water-heater-repair-and-replacement/
kind: subService
updated: 2026-07-29
source: OCRV Center
---

# RV Water Heater Repair and Replacement, Tanked and Tankless

> Which source still works tells you the fault. Gas out but electric fine points at ignition or a blocked burner tube. Repairs and swaps run **$350 to $4,500** at **$260 per hour**.

## How is an RV water heater diagnosed and replaced?

RV water heater work covers Suburban and Atwood tanked units, Truma and Girard tankless units, their gas valves, electrodes, thermostats and anode rods. Rancho Santa Margarita owners bring units to Yorba Linda, where LP pressure is read on a manometer and the opening is measured before any replacement is ordered.

- Hot on shore power and cold on propane is an ignition question
- A Suburban steel tank needs an anode rod, an Atwood clad tank does not
- Bypass valves left in the winter position produce cold water from a healthy heater
- Tankless retrofits need gas capacity and an opening that actually fits

### Key facts

| Item | Value |
| --- | --- |
| Price range | $350 to $4,500 (1 to 18 labor hours at $260 per hour) |
| Labor rate | $260 per hour (Mechanical and electrical department) |
| LP handling | $45 flat (Hazmat and disposal charge where LP or chemicals are involved) |
| Typical turnaround | 1 to 4 shop days (Longer where a tankless retrofit needs cabinetry work) |
| Written estimate | $150 (Credited in full against an authorized repair) |
| Units serviced | Suburban SW6DE and SW10DE, Dometic and Atwood G6A-8E, Truma AquaGo, Girard GSWH-2 |

Almost every hot water complaint arrives described as no hot water, and almost every one of them contains the diagnosis already, in the part of the sentence the owner did not think mattered. Which source did you try. Was there hot water and then it went cold, or has there been nothing since the trip started. Did the reset button click. Those three answers separate an ignition fault from a thermostat fault from a bypass valve somebody left turned in October.

Two very different pieces of hardware live under this heading. A six or ten gallon tanked heater with a burner, an electric element and a steel or aluminium clad tank. Or a tankless unit that heats on demand and is sensitive to flow rather than to capacity. They fail for unrelated reasons and the retrofit between them is a real project rather than a swap, so both get treated properly here.

## The question that resolves most hot water faults

Which source still works. Almost every tanked heater on the road runs on propane, on a 120 volt element, or on both, and the two systems share only the tank and its thermostats. So hot water on shore power with nothing on propane places the fault firmly on the gas side: the burner tube, the electrode, the gas valve or LP pressure. Nothing on either source moves the suspicion to the thermostat pair, the cutoff, or a tank that is not actually full of water.

Owners frequently discover during this conversation that one side has been dead for a long time. A coach that lives on a hookup at home covers a failed burner for months, and the problem only surfaces on the first trip where propane is the only option. That is worth knowing before you conclude the unit failed suddenly, because it also tells you how long the burner has been sitting with a tube full of whatever moved into it.

- Gas dead, electric fine: burner tube, electrode, gas valve or LP pressure
- Electric dead, gas fine: element, its thermostat or the 120 volt supply
- Neither works: thermostat pair, cutoff, or the tank is not full
- Works then goes cold fast: capacity, mixing valve or a scaled tank
- Cold water from a working heater: bypass valves still set for winter

## Suburban steel and Atwood clad tanks are not the same appliance

This distinction matters more than any other in the category and most owners have never had it explained. Suburban builds a porcelain lined steel tank and fits a sacrificial anode rod, because steel and hot water are a corrosion pair and the rod is designed to be consumed instead of the tank. That rod is a maintenance item. Ignore it and it disappears, and once it is gone the tank wall is what corrodes next.

Dometic, formerly Atwood, builds an aluminium clad tank that does not use a sacrificial rod at all. There is nothing to inspect and nothing to replace, which is genuinely simpler. It also means that when an owner is told their heater needs a new anode rod, the first useful question is which tank they actually have, because half the time the answer is that no such part exists on their unit and somebody was reading from the wrong page.

**What changes between the two tank families**

| Item | Suburban SW series | Dometic and Atwood G series |
| --- | --- | --- |
| Tank material | Porcelain lined steel | Aluminium clad |
| Anode rod | Fitted and consumable, inspect yearly | Not fitted, nothing to check |
| Drain | Anode rod doubles as the drain plug | Separate plastic drain plug |
| Common water side failure | Rod consumed, then tank corrosion | Drain plug threads and scale |
| Ignition | Electrode with gas valve and board | Electrode with gas valve and board |

## Burner tubes, electrodes and LP pressure under load

A burner tube is an open pipe pointing at the outdoors through a louvred door, and insects treat it as accommodation. A mud dauber nest or a spider web inside the tube disrupts the air fuel mix, which produces a yellow lazy flame that either fails to satisfy the sense circuit or sooty combustion that streaks the outside panel. Pulling and cleaning the tube, then resetting electrode geometry to the specified gap, resolves a large share of gas side complaints without any parts at all.

The other half of the gas story is pressure, and it has to be read while the appliance is firing. A regulator can measure correctly at rest and sag once a burner draws on it, particularly on a coach where a furnace and a refrigerator are competing for the same supply. That is a manometer job, not a guess, and it is the reason a heater that a previous shop declared faulty sometimes turns out to have been starved rather than broken.

> **warning:** Sooting above the burner opening is a combustion warning, not a cosmetic one. A unit producing soot is producing carbon monoxide, and it should not be run in an occupied coach until the tube and flame have been inspected.

## The bypass valves that cause a fault that does not exist

Behind the heater on nearly every unit sits a set of two or three valves whose job is to isolate the tank so antifreeze can circulate through the coach without filling six gallons of it. In winter position the tank is out of circuit and empty. In summer position it fills and heats. Every autumn, somebody sets those valves and every spring somebody forgets to set them back.

The result reads like an expensive failure. Cold water at every tap while the heater sounds like it is working. Or the element energising into an empty tank, overheating, and tripping the cutoff, which owners then reset until something is genuinely damaged. We check valve position before opening anything, feel the tank fill, and label the valves on the way out so the next person to winterize the coach can see which way is which.

## Tankless units and what a retrofit actually involves

On demand units like the Truma AquaGo and the Girard GSWH-2 trade tank capacity for continuous supply, and they are excellent in a coach with adequate gas and reasonable flow. Their failure pattern is different from a tanked heater. They are sensitive to scale, to flow rate at the fixture, and to inlet water temperature, and at very low flow some installations produce alternating hot and cold at the shower head, which is a plumbing and habit issue as much as an appliance one.

A retrofit from tanked to tankless is not a swap. The aperture in the sidewall is a different size, the burn rate is far higher so the gas supply and regulator capacity have to be confirmed, condensate and flue arrangements differ, and the interior trim and surround usually need rebuilding. We measure the opening, check gas capacity and quote the cabinetry before recommending it, which is the opposite order from how these get sold at a show.

## What this costs, and why the coach comes to us

Water heater work bills at $260 per hour across a band of $350 to $4,500, with the low end covering a burner clean and verification and the top covering a tankless retrofit with cabinetry. Parts carry standard markup, sales tax applies to parts and materials, labor is not taxed, and a $45 hazmat and disposal charge applies wherever LP is handled. A written estimate is $150 and credits in full against an authorized repair.

We do not offer mobile service on gas appliances and there is no roadside version of this work. A manometer reading under load, an electronic leak check on every joint disturbed, and a full heat cycle observed on both sources are the minimum standard for releasing an LP appliance, and none of that happens usefully in a driveway. The run from Rancho Santa Margarita up the 241 to the 91 is short and it is the right way to have a gas appliance signed off.

> **price:** Where a tank has begun corroding through its lining we will say replacement rather than sell a rod and a flush. A rod in a tank that is already weeping is money spent to delay the same job by one season.

## Which vehicles we do this on

Gas and diesel motorhomes, Class C units where the heater sits in a tight cabinet behind the dinette, trailers and fifth wheels with the familiar exterior access door, truck campers where the whole appliance bay is the size of a suitcase, and Sprinter based builds where a tankless unit is often the only thing that fits. Access varies enormously and it is the main reason two identical heaters can be four hours apart in labor.

## Cost

$350 to $4,500, based on 1 to 18 labor hours at $260 per hour.

Written repair estimate is $150, credited in full against an authorized repair. All work is performed in shop.

## Questions and answers

### Why do I get hot water on shore power but nothing on propane?

The fault is on the gas side, since the two sources share only the tank. In order of likelihood: a nest or web blocking the burner tube, an electrode out of gap so flame sense fails, low LP pressure under load, or the gas valve. A burner clean and a manometer reading resolve most of them.

### Does a Suburban tank need an anode rod and does a Dometic one?

A Suburban porcelain lined steel tank needs one and it is consumable, so it should be inspected yearly and replaced when eaten. A Dometic or Atwood aluminium clad tank has no anode rod at all and nothing to check. Knowing which tank you own prevents buying a part your unit cannot accept.

### What does a rotten egg smell in the hot water actually mean?

Sulphate reducing bacteria reacting with a consumed anode rod or a corroding tank wall, usually on a steel tanked unit that has sat with warm water in it. We pull the rod, flush and sanitize the tank. Where the lining has already failed underneath, the smell is a symptom of a tank on its way out.

### My bypass valves were left set for winter. What damage does that do?

The tank sits empty, so every tap runs cold while the unit appears to work. Worse, an energised element in an empty tank overheats within minutes and trips the cutoff, and owners reset it repeatedly. That sequence is how a healthy heater becomes an element replacement or a scorched tank.

### Is a Truma AquaGo a sensible replacement for a six gallon tank?

Sometimes, and it depends on three measurements rather than on preference. The sidewall aperture has to accept a different footprint, the gas supply and regulator must carry a much higher burn rate, and fixture flow has to be enough to trigger and hold the burner. We measure all three and quote the trim work before recommending it.

### How often should the thermal cutoff trip for a legitimate reason?

Effectively never. It is a safety device, not a working control, so a unit that trips it is telling you something got too hot: a drifted thermostat, a scaled tank concentrating heat, or an element energised into a tank that was not full. Repeated resetting without diagnosis is what turns that into a replacement.

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Source: [OCRV Center](https://ocrv.me/services/plumbing-repair/water-heater-repair-and-replacement/). Last verified 2026-07-29.