Mixing Valve Blues...

Constantin

...so we finally threw out the nasty old water heater on the boat (technically, a calorifier). It uses engine coolant-circuit water to heat the potable water via a HX. The old unit had a leaky HX, which made for funny tasting water and wild swings in the coolant levels inside the Diesel (yech!).

The new stainless water heater from Allcraft is fantastic. Not only is it very well constructed, it's also amazingly effective. As a result, our hot potable water is very, very hot!

Unfortunately, this has turned into a bit of a problem because 190° hot water isn't healthy for either the occupants of the boat nor its hot water distribution system. In fact, I'll probably have to buy some metal "Tees" for the ½" connections on board since the propylene ones melted a while ago and the nylon ones I have installed in the interim will probably soften too...

So, in order to protect the boat an people alike, I am looking for a low-capacity (i.e. 2.5GPM) but quality mixing/tempering valve to temper water temps down to 120°F. Any suggestions?

Mark Eatherton1

Honeywell...

Sparco. I think it's an AM 30. Maybe Bill from Honeywell will chime in. Dependable, inexpensive and serviceable.

ME

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Constantin

Thanks Mark!

I went for a Honeywell AM101R-UT-1 that I found on e-Bay. I know that it wouldn't pass the potable-water muster for landlubbing inspectors, however the unit should work well enough for our application (it is rated from 80-180°F) and will be an improvement over anything there was, which is nothing...

I figure if I restrict it down to 120°F, the 20 gallon hot water heater at 190°F will now yield 30 gallons of 120°F water once it has been tempered down. I will have to re-arrange the piping a little bit but that's nothing more than a minor detail. Thanks again!