Dometic Atwood 6-Gal Water Heater Main Burner | 91638 | Electric

Restore reliable ignition and burner operation to your 6-gallon Atwood/Dometic RV water heater with the Dometic / Atwood 91638 Main Burner. This genuine Dometic OEM replacement main burner tube is the component where propane mixes with combustion air and ignites — delivering the flame that actually heats your water. When the burner gets damaged, carboned up, or corroded, you'll see symptoms ranging from hard starts to poor flame quality to outright ignition failure.

For 6-Gallon Atwood / Dometic G6, GC, and GH Water Heaters

The 91638 fits an extensive range of 6-gallon Atwood/Dometic water heaters with electronic ignition:

G6A Series

• G6A-6E, G6A-7E, G6A-8E

GH6 Series

• GH6-6E, GH6-7E, GH6-8E

GC6 / GC6A / GC6AA Series

• GC6A-7E
• GC6AA-7E, GC6AA-8E, GC6AA-9E, GC6AA-10E

GCH6 / GCH6A Series

• GCH6-4E, GCH6-6E, GCH6-7E
• GCH6A-7E, GCH6A-8E, GCH6A-9E, GCH6A-10E

Verify your existing water heater model on the manufacturer label before ordering — the 91638 is specifically for these 6-gallon models with electric ignition and is NOT interchangeable with other water heater sizes or ignition types.

⚠️ DO NOT USE on G610-3, GC610-3, or GH610-3 Models

The 91638 is NOT compatible with the following models, even though they may appear similar to compatible models:

• G610-3
• GC610-3
• GH610-3

These specific models use a different main burner. If your water heater model is one of these three, this 91638 is NOT the correct burner — installing it will result in improper combustion, ignition failure, or unsafe operation. Double-check your model number before ordering.

What This Burner Does

The main burner is where propane combustion actually happens in your water heater:

• Propane enters the burner tube from the gas valve
• Mixes with combustion air drawn through the air shutter
• The igniter electrode sparks the mixture, creating the flame
• The flame heats the water through the tank's heat exchange surface

The burner is in a hostile environment — constant flame exposure, thermal cycling, combustion byproducts, and moisture. Over time, even quality burners degrade.

Common Failure Symptoms

Common reasons to replace the main burner include:

• Hard ignition — water heater struggles to light
• Poor flame quality — yellow flame, sooty burning, irregular pattern
• Carbon buildup on the burner that doesn't clean off
• Corrosion or rust on the burner tube or orifice area
• Burner damage — cracks, deformation, or visible wear
• Repeated flame drop-out mid-cycle

If your water heater is failing to ignite reliably or burns poorly, inspect the burner alongside the gas valve and igniter electrode — all three are critical to clean combustion.

Zinc-Finished Construction

The 91638 features zinc-coated metal construction — providing corrosion resistance in the burner area where combustion byproducts and moisture create a corrosive environment. Standard durable material for water heater main burners.

Genuine Dometic OEM Replacement

As a Dometic factory replacement part, the 91638 is built to original specifications for a precise drop-in fit in compatible water heater installations.

Paired Component — 6-Gallon DSI Gas Valve

The main burner works hand-in-hand with the water heater's gas valve. The matching 6-gallon DSI gas valve is the Dometic 92078 Gas Control Valve — covers the same 6-gallon DSI Atwood water heaters this main burner fits. Both components often fail or need attention together, so if one needs replacement, it's worth checking the other.

⚠️ Professional Installation Recommended

Main burner replacement involves opening the water heater's combustion chamber, working around the gas valve and propane connections, and verifying proper combustion after installation. Installation should be performed by a qualified RV service technician. Always check for proper flame appearance, leak-test propane connections, and verify safe operation after any burner service.

Key Features

• Genuine Dometic / Atwood OEM main burner
• For 6-gallon Atwood/Dometic LP gas water heaters with electric ignition
• Wide compatibility: G6A, GH6, GC6A, GC6AA, GCH6, GCH6A series
• NOT compatible with G610-3, GC610-3, or GH610-3 models
• Zinc-finished metal construction for corrosion resistance
• Electric ignition type
• Direct OEM replacement
• Weight: 2 lbs

Specifications

• Brand: Dometic (Atwood)
• Part Number: 91638
• Type: Main Burner Tube
• Application: 6-gallon Atwood/Dometic LP gas water heaters
• Ignition Type: Electric
• Material: Metal
• Finish/Color: Zinc
• Compatible Models: G6A-6E, G6A-7E, G6A-8E, GH6-6E, GH6-7E, GH6-8E, GC6A-7E, GC6AA-7E, GC6AA-8E, GC6AA-9E, GC6AA-10E, GCH6-4E, GCH6-6E, GCH6-7E, GCH6A-7E, GCH6A-8E, GCH6A-9E, GCH6A-10E
• NOT Compatible With: G610-3, GC610-3, GH610-3
• Weight: 2 lbs