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Old 05-15-2022, 09:37 AM   #1
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Join Date: Dec 2021
Location: Mont Vernon NH
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Water heater output too hot! (Micro-Minnie 1708)

Hi All!

I have a new 2022 Micro-Minnie 1708 that has hot water which is too hot at the tap. It measures 145F if using electric heater, and 155F if using gas heater (hot enough for scalding risk - yikes!).

The Dometic water heater (WH-6-GEA) manual implies that the water heater has a (non-adjustable) mixer valve that is supposed to blend cold water with the hot tank water to ensure tap water does not exceed 130F. However, I do not see a mixer valve on or near the water heater. I was able to adjust the bypass valve as a way to reduce max water output temperature, but not sure that is really the best fix.

I suppose I will have to bring the trailer back to the shop for this, but I am wondering if anyone else has any info / thoughts about this?

Thank you,
John L
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Old 05-15-2022, 10:01 AM   #2
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Sounds like a faulty thermostat. You can replace it yourself fo $20, or wait for months to get a service department appointment. I know, that smells, but I can tell you, I’ve repaired about 5 critical things on my micro Minnie since we bought it 18 months ago. Although they would have been legit warranty claims, fixing stuff yourself is often cheaper, and definitely faster than waiting on warranty service. You can test it with a multimeter before replacing, but it’s probably less hassle to just order a new one and replace.
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Old 05-15-2022, 02:08 PM   #3
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Quote:
Originally Posted by Marine359 View Post
Sounds like a faulty thermostat. You can replace it yourself fo $20, or wait for months to get a service department appointment. I know, that smells, but I can tell you, I’ve repaired about 5 critical things on my micro Minnie since we bought it 18 months ago. Although they would have been legit warranty claims, fixing stuff yourself is often cheaper, and definitely faster than waiting on warranty service. You can test it with a multimeter before replacing, but it’s probably less hassle to just order a new one and replace.
Hi Jim,

Thanks for your response - yes good point; I'll look into the thermostat also..
(Also thanks for your service! Our son is currently in the Marines - he's a pilot; flying Hueys).
regards, john L
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Old 05-15-2022, 02:41 PM   #4
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Location: Kansas
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Hi John, it seems like RV water heaters generally run pretty hot. I think it might be because a 6 gallon tank is fairly small so they expect the user to manually mix in some cold water at the faucet so the hot water lasts longer. Some RVs have automatic mixing valves but I would guess that most do not. If you do a search on the forums you will find a lot of posts about the hot water is too hot.

One thing, since you plan to check the thermostat is to make sure the thermostat makes really good contact with the tank. If there is poor contact, the water will get extra hot before the thermostat senses it and opens. You might also be able to buy lower temperature thermostats.
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Old 05-16-2022, 06:51 PM   #5
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Yes, will do, thanks.
From what I have been able to learn from the Dometic water heater installation manual, the water temp in the hot water tank is intended to be pretty hot (150-160F) and a 'mixer valve' is supposed to mix in some cold water to the hot water coming out of the tank so that the hot water at the tap is not greater than 130F. Makes sense; however I can not locate this mixer valve. Seems that the water I'm getting at the tap is full hot - not 'mixed'.
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Old 05-23-2022, 07:13 PM   #6
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We had the same problem. Purchased an adjustable thermostat off Ebay. Dometic 93105 Adjustable Thermostat Control Replacement. Works great.
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