[bikestuff]

Ok, here is some more diagnostic information. I will give you the bottom line first and then show the data....

I started with the AH in electric mode and switched to diesel during the test. The water in sink and shower started off at 107F and quickly dropped to 86F and eventually got back up to 96F after turning on diesel. (Sink and shower were essentially the same).

The interesting part is the "Rudy test"....Monitoring the temperature into and out of the tempering valve. The IN and OUT temperatures were never more than 6F different. Starting at 64/66F and ending at 76/81F. THE INTERESTING PART IS THAT THE OUT TEMP NEVER GOT HOT.

The temperature on the AH unit essentially tracked the sink temperature.
   

The heater circuits come out of the AH unit further back and up. Those were HOT! 136-140F.
   

So...I am left with the following question...If the heater circuits get hot, but the circuit going to the tempering valve does not...does that mean that there are multiple paths through the AH boiler?

DATA
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Outside ambient temperature was around 35F
Tankage temperature was around 70F
Sink temperature started around 107 and dropped to 86 in about a minute.
After turning the diesel on sink temperature recovered to around 96.
AH Model number AHE-120-02X