Hot water mixing valve


  #1  
Old 10-24-05, 02:31 PM
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Hot water mixing valve

Our domestic hot water is provided off a coil on the boiler (oil). Currently all of our water lines are 1/2" and I'm upgrading them to 3/4". The current setup on the boiler has the cold water going in, a hot water line coming out that goes into the mixing valve along with a branch from the cold water. Then the hot water line goes from the mixing valve to the rest of the fixtures. The 3/4" mixing valve I got shows an illustration of a hot water line going directly from the coil to "appliances" and a branch from that going to the mixing valve. Since that direct hot water line doesn't exist in my current setup, I'm wondering if and why I would need it.

Thanks,
 
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Old 10-24-05, 08:37 PM
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You need a mixing/tempering valve due to the fact that the water from your boiler is way too hot to go to the fixtures.
 
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Old 10-25-05, 09:39 AM
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I'm not questioning the need for the mixing valve. It's the hot water line shown in the installation illustration for the new valve that bypasses the valve and goes to "appliances". I don't currently have that - all hot water comes from the mixing valve. It seems to me that running a direct hot water line would send out water that was too hot. So when I replace the 1/2" lines with 3/4" can I keep the existing layout or, for some code reason or other that I don't understand, does there need to be a direct line from the coil to the "appliances".

Thanks,
 
 

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