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Old 01-13-2010, 04:06 PM   #1
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Installing saddle valve on hot water pipe


I'm installing a new saddle valve on a hot water pipe for a feed line for a whole house humidifier. Do I need to shut off my main water supply valve when I do this, or just ensure no one places a demand on hot water until the work is complete? (I know I would shut off the main supply if I was installing on a cold water pipe, but am not sure if this would influence the pressure on the hot water side.)

I ask because my main system supply valve is a little touchy and I'd prefer to stay away from it if at all possible.

Any other steps I should consider regarding the pipe I'm installing it on, besides this issue? Thanks.
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Old 01-13-2010, 06:10 PM   #2
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Installing saddle valve on hot water pipe


install the humidifier line on cold water side,youll be much happier!
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Old 01-13-2010, 07:05 PM   #3
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Installing saddle valve on hot water pipe


Ok, but what will the difference be? I thought the h/w would aid the evap process, plus the existing valve for the humidifier I'm replacing is on the hot side (I can't reuse the valve - seized - old house I bought). But that's why I'm here, to get educated! Thx.
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Old 01-13-2010, 08:06 PM   #4
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Installing saddle valve on hot water pipe


in all the years ive done them its always been on cold side just like icemaker lines.hot water lines tend to accumulate more crud ,which i think would tend to close off the valve easier.whichever side you install it on make sure to open/close valve a couple times throughout year to keep it from getting stuck as easy.
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Old 01-13-2010, 09:21 PM   #5
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Installing saddle valve on hot water pipe


Db,
The better saddle valves don't use the piercing needle point. They require a 1/4" hole be drilled into the pipe and have a rubber washer to provide a seal. These flow much, much better then the needle type.
Mike Hawkins
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Old 01-14-2010, 07:13 AM   #6
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Installing saddle valve on hot water pipe


I am against the "needle piercing" valves. Also agree that the humidifier should be on the cold line. If you want to install on the hot line, all you need to do is turn off the cold water inlet valve at the water heater. Open a hot water faucet to relieve the pressure.
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Old 01-14-2010, 11:11 AM   #7
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Installing saddle valve on hot water pipe


Thanks for all the advice! Much appreciated.
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