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Old 05-02-2012, 10:07 AM   #1
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Tankless WH with no Pressure Valve


Pulled the trigger on the tankless as a last min decision...

Long story short - its installed but i didn't see that my contractor installed the pressure valve?

should i be concerned about this ? I know he oversized the pipes for better overall water pressure - not sure if that matters either.

Its working fine - 10-15 sec lag on hot water which is expected but not sure if the valve not being installed is an issue.

Any direction/help on this topic is appreciated.

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Old 05-02-2012, 10:45 AM   #2
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Tankless WH with no Pressure Valve


Which 'pressure valve' are you talking about? Temp & pressure relief valve or pressure reducing valve?

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Old 05-02-2012, 10:50 AM   #3
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Tankless WH with no Pressure Valve


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Which 'pressure valve' are you talking about? Temp & pressure relief valve or pressure reducing valve?

From the looks if it - there is no valve whatsoever.

I was referring to the pressure relief valve that i thought was supposed to be installed.

The other service valves - I'm not concerned with as there are standard shut-offs there - just not the "fancy" versions that you can buy.
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Old 05-02-2012, 10:55 AM   #4
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Tankless WH with no Pressure Valve


More likly there's an over heat relay that shuts off the unit, There is no tank to blow up.
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Old 05-02-2012, 10:57 AM   #5
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Tankless WH with no Pressure Valve


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More likly there's an over heat relay that shuts off the unit, There is no tank to blow up.

so is the valve is a nice to have but not 100% needed ?
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Old 05-02-2012, 11:11 AM   #6
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Tankless WH with no Pressure Valve


What does your owners'/install manual say? I have and T&P on my Navien unit. It has a 1 gal storage tank inside.
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Old 05-02-2012, 07:57 PM   #7
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Tankless WH with no Pressure Valve


thank you spaceboy for understanding a tankless does not mean instant hot water out of tap
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Old 05-02-2012, 10:15 PM   #8
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Tankless WH with no Pressure Valve


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thank you spaceboy for understanding a tankless does not mean instant hot water out of tap

don't get it.
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Old 05-02-2012, 10:17 PM   #9
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Tankless WH with no Pressure Valve


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What does your owners'/install manual say? I have and T&P on my Navien unit. It has a 1 gal storage tank inside.

As per code must be installed according to manufactures specifications.
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Old 05-02-2012, 10:46 PM   #10
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Tankless WH with no Pressure Valve


Javiles, see the other 3 page long tankless water heater thread if you dare...

Spaceboy, when I was researching a tankless heater all the manuals I looked at called for a pressure relief valve, with many stating to contact the building department to see if you needed a temperature & pressure relief valve to meet code.
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Old 05-03-2012, 10:05 AM   #11
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Tankless WH with no Pressure Valve


My tankless has a T&P valve. It came with the unit when I bought it.
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Old 05-03-2012, 10:52 AM   #12
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Tankless WH with no Pressure Valve


My tankless Richmond (Rheem) has a pressure relieve valve that was shipped with the unit. If there is some type of check valve that prevents expansion back to the cold water side, I can see the need for one.
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Old 05-03-2012, 01:43 PM   #13
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Tankless WH with no Pressure Valve


Quote:
Originally Posted by spaceboy View Post
Pulled the trigger on the tankless as a last min decision...
Long story short - its installed but i didn't see that my contractor installed the pressure valve?
should i be concerned about this ?
Here's a thought. Is it possible that the tankless unit could ever fail in a "heat water" condition? If yes, then there has to be a pressure relief valve in the system to protect from over pressure. I would install one for sure.

HRG

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