Description
Get Hot Water Flowing Again in Your RV
No hot water in your RV? The ECO (Energy Cut-Off) thermostat is one of the most common failure points in Atwood and Dometic RV water heaters. When it fails, the burner won't ignite or the water stays cold. Our replacement ECO thermostat assembly restores proper temperature control and safety shutoff to your RV's water heater — so you can get back to comfortable camping.
Symptoms of a Failed ECO Thermostat
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No hot water at all — Burner never fires or electric element won't heat
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Water too hot or not hot enough — Thermostat calibration off
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ECO trips repeatedly — Safety cutoff keeps triggering for no reason
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Intermittent heating — Water heater works sometimes, then stops
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Visible corrosion or damage — Physical damage to the thermostat or wiring
Compatibility
| Brand |
Model Series |
Type |
| Atwood |
GC6AA-10E, GC10A-4E, GCH6A-10E, GCH10A-4E |
Gas/Electric Combo |
| Atwood |
G6A-8E, G10-3E, GH6-8E |
Gas Only |
| Atwood |
EH6, EH10, EHM6, EHM10 |
Electric Only |
| Dometic (Atwood) |
Post-2014 Atwood-branded Dometic heaters |
All Types |
Replaces Part Numbers: Atwood 91447, 93866, 93105, 91446
Specifications
| Specification |
Detail |
| Type |
ECO (Energy Cut-Off) Thermostat + Hi-Limit Switch Assembly |
| Voltage |
12V DC control circuit (compatible with 120V AC element control) |
| Temperature Range |
110°F - 140°F (adjustable thermostat) |
| ECO Trip Point |
180°F ±5°F (safety cutoff) |
| Includes |
Thermostat, hi-limit switch, mounting bracket, wiring harness |
| Installation |
Direct replacement — uses existing mounting holes and wiring |
Installation — 20-Minute DIY
-
Turn off all power — 12V DC (battery disconnect) AND 120V AC (shore power/circuit breaker)
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Access the water heater — Remove the exterior access panel
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Remove the old thermostat — Disconnect wires (take a photo first for reference), unscrew from tank
-
Install the new assembly — Mount to tank (ensure good surface contact), reconnect wires to matching terminals
-
Test operation — Restore power, fire up the water heater on gas and electric modes to verify
Why Choose iFJF?
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Exact replacement — Matches Atwood 91447 specifications and mounting pattern
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Dual function — Includes both the thermostat AND hi-limit safety switch
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Pre-calibrated — Ready to install — no temperature calibration needed
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Corrosion resistant — Sealed terminals and weather-resistant design for exterior installation
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Fast DIY fix — Most RV owners complete the swap in under 30 minutes
Frequently Asked Questions
Q: How do I know if the thermostat or the heating element is bad?
A: If your water heater works on gas but not electric (or vice versa), the issue is likely the heating element or control board, not the thermostat. If you get no heat on either fuel source, the ECO thermostat is the prime suspect.
Q: Does this fit the Dometic version of the Atwood water heater?
A: Yes. Dometic acquired Atwood in 2014 and continued using the same thermostat design. If your Dometic water heater has the Atwood-style thermostat, this replacement fits.
Q: Why does my ECO thermostat keep tripping?
A: Frequent ECO trips usually indicate the thermostat is failing and tripping at a lower temperature than designed. However, it can also indicate an actual overheating problem — check your burner flame and ensure the tank isn't running dry.
Q: Do I need thermal paste for installation?
A: The thermostat mounts directly against the tank surface. A thin layer of thermal compound can improve temperature sensing accuracy, but it's not required for proper operation. Most OEM installations don't use it.
Q: Can I test the old thermostat before replacing it?
A: Yes. With a multimeter set to continuity, you should have continuity across the ECO terminals at room temperature. If it reads open (no continuity), the ECO has tripped or failed and needs replacement.
