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Old 08-03-2022, 09:16 AM   #1
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Aquahot 450d Gets cold

Recently changed filter and new fuel nozzle, and cleaned up burner. After a while we noticed that we were more quickly running out of hot water, so I installed a mixing value and set temp a little higher than average. We still run out of hot water too quickly.

Seem all the lights\pumps are on as they should be.

Any ideas on troubleshooting and\or cause?

Thanks!

PS I also have the electric element turned on.
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Old 08-03-2022, 09:33 AM   #2
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Try using it with the electric element turned off. The electric thermostat is set 20 degrees higher than the diesel burner thermostat and can keep the burner from coming on as soon as it should.
Also, if the incoming shore water is cold, use water from your onboard tank as it will be warmer.
Hope this helps.
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Old 08-03-2022, 09:34 AM   #3
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Maybe a failed stir pump .

Don't know if that would give you a red light on the panel or not.
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Old 08-03-2022, 07:35 PM   #4
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Quote:
Originally Posted by 96 Wideglide View Post
Maybe a failed stir pump .

Don't know if that would give you a red light on the panel or not.
It will give you a red light if I remember. I checked the pump and its working, I also replaced it ~2yrs ago when it did fail.
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Old 08-10-2022, 06:12 PM   #5
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Interesting observation....

I started this thread while we were in much higher elevations, CO and WY. Now that we have made it down the hill into the flatlands, seems like my AQ is back to performing as normal. I have plenty of hot water to take multiple showers in a row.

Can anyone speak with expertise, on the effect of elevation on AH?

Thanks!
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Old 08-10-2022, 06:32 PM   #6
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As a repairman, my experience has been that incoming water temperature has a direct impact on output temperature at the faucet. Ground water temperatures in the high elevations of Wyoming and Colorado have a significant impact on the ability of the Aquahot to produce hot water. The Aquahot service manual states that the unit only has the ability to raise the water temperature 55 degrees F. Is it possible this is what you have experienced?
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Old 08-10-2022, 06:41 PM   #7
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Fill your onboard freshwater tank the day prior and let the water in it warm up overnight.
Then use your 12v water pump to supply water for showers.
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Old 08-10-2022, 09:41 PM   #8
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The burner gets less oxygen. There is an air intake adjustment gate for mixture under the burner intake. You do open them more for high altitudes. It's not an adjustment you fool with. Set it and forget it for your average overall use. Also water boils at a much lower temp up high. So I believe it's not holding onto as many BTUs of heat .
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Old 08-11-2022, 05:25 AM   #9
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You should have hot water and heat even at altitude.

Ours worked fine in the Denver area, and also in a campground slightly higher on the other side of the Rockies. We've also camped when it's below freezing and had plenty of heat and hot water.

The boiling point of water does decline with altitude, but below 13,000' it's still above the set point for AquaHot's boiler. Good chart here: https://www.engineeringtoolbox.com/b...de-d_1344.html
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