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Old 01-25-2011, 10:05 AM   #1
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hydro hot

my hydro hot run,s hot and cold on the residential wter. heat is fine. I have scalding hot water and then it slowly turns to tepid, turn it off and back on and it,s hot again. the stir pump has been replace. this is in a 2002 mountainaire. any idea,s??? thank,s Doug
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Old 01-25-2011, 02:35 PM   #2
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Do you have too much water pressure or to much flow? I found mine is more stable if I just run coach pump when showering instead of supply water.
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Old 01-26-2011, 03:02 AM   #3
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Have you got your outside shower faucets fully closed. If not they will act as a mixing valve.
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Old 01-27-2011, 09:35 AM   #4
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hydrohot

thanks for the reply,s I double checked my outside shower and it is closed tight. any more thought,s thanks Doug
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Old 01-27-2011, 09:48 AM   #5
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We had precisely this problem.

The fix was to replace the tempering valve that controls the temperature of the domestic hot water. On our coach, that valve is located on the outlet side of the hydro-hot where it can be easily accessed. the valve was about $150.00 from Monaco parts (it's a Honeywell valve, no doubt available from plumbing suppliers) and took about 30 minutes to replace.

Since replacing, the domestic hot water temperature has been stable making for comfortable showers.
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Old 01-27-2011, 09:53 AM   #6
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That valves supposed to be adjustable.
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Old 01-27-2011, 02:12 PM   #7
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Yes, that valve is adjustable - if its working.

Ours wasn't and after replacement, the system works as it's supposed to.
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Old 01-28-2011, 07:38 AM   #8
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Here is a link to the aquahot guru

RV Hydronic Heater Repair - Home

also the yahoo group for hydronic heating

HydronicRVHeating : Hydronic-RV-Heating
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