Hydro Hot runs out of hot water

[Tom Webber]

I have a 2006 Beaver Monterey with Cat 350 engine. With the Hydro Hot running on diesel you run out of hot water before you are finished taking a shower even when shutting of water off while lathering with soap. One starts with comfortable temperature and slowly you have to add more hot water and then you run out. Anyone have an idea as to why this is happening. I bought this coach used in 1/17 and this problem has been from day one. Alliance Coach replaced the filter and nozzle before I completed purchase of this unit.

[Steve Huber Co-Admin]

Tom,
Assuming your burner and stir pump are  continuing to run, it sounds like the mixing valve may be going bad. I had similar symptoms on an 01 Contessa and had to replace the valve. It's purpose is to mix cold water with the constant temperature hot water supplied by the heating chamber. When it starts to malfunction it will add varying amounts of cold water. Not sure which HH model you have but on the unit I had (think it was a model 200) the valve was accessed on the rear of the unit. Mine had a temperature control adjust that I turned back and forth before returning it to its original position and that gained me about 6 months of operation before it failed and I had to replace it.
Steve

[Tom Webber]

Thanks for the prompt reply. I have a HH Model 200-09E, so it sounds like we might have be working without the same model.  I am not real mechanical. On June 1st I have a mobile RV repairman that is certified by HH coming to my location in Owatonna, MN and I will have him check this out.