Reply
 
Thread Tools Search this Thread Display Modes
 
Old 09-16-2019, 04:57 PM   #1
Veteran Member
 
seabum's Avatar
 
City: Westerly, RI
Country: USA
Vessel Name: Magic Moment
Vessel Model: Mariner Orient 38 Euro
Join Date: Feb 2017
Posts: 56
Recommend type of pipe nipple for fresh watt connection to water heater

I have installed a new water heater and have researched many online place and talked to several plumbers, and still have no idea if I should use plastic or brass nipples for the fresh water connections, and even if I should use Teflon tape or pipe dope. What does the Forum recommend?
__________________
Advertisement

seabum is offline   Reply With Quote
Old 09-16-2019, 04:59 PM   #2
Guru
 
Comodave's Avatar
 
City: Au Gres, MI
Country: US
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 5,531
I think I would use brass coming off the water heater just in case the plastic might melt. But then again I suck at plumbing...
__________________

__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
Comodave is online now   Reply With Quote
Old 09-16-2019, 05:01 PM   #3
Dauntless Award
 
Wxx3's Avatar
 
City: New York, NY
Country: USA
Vessel Name: Dauntless
Vessel Model: Kadey Krogen 42 - 148
Join Date: Jan 2013
Posts: 2,717
I jst did this for my new Raritan water heater.
Use brass with pipe tape on all the fittings.
__________________
Richard on Dauntless,
New York

a Kadey Krogen 42 currently: https://share.garmin.com/dauntless
Blog:
https://dauntlessatsea.com
Wxx3 is offline   Reply With Quote
Old 09-16-2019, 05:53 PM   #4
Guru
 
Maerin's Avatar
 
City: East Coast
Country: USA
Vessel Name: M/V Maerin
Vessel Model: Solo 4303
Join Date: Jun 2013
Posts: 818
Brass should be fine, although the state of California has determined that use of brass nipples will kill you and they've outlawed them. They use stainless there. So you could use brass or stainless if you're concerned about the brass. Since you're not generally drinking heated water, the exposure factor is minimal. Don't use plastic. Under uncontrolled conditions, the water heater can reach temps that will damage the plastic. CPVC has a higher temperature rating of 200F, inadequate for use as a nipple or direct tank connection. PVC is lower. Regardless of the technical details, it's simply inappropriate for that application. Brass, stainless, a PEX adapter, whatever. Many water heaters ship with a dielectric nipple, it's plated steel with a plastic liner, they work fine, and use of a CPVC adapter on that is OK, although I doubt that your vessel's fitted with CPVC, more likely PEX or some variation of polyethylene. So, brass is good!
__________________
Steve Sipe
Selene 4303 Maerin
http://maerin.net
Maerin is offline   Reply With Quote
Old 09-16-2019, 06:31 PM   #5
Veteran Member
 
seabum's Avatar
 
City: Westerly, RI
Country: USA
Vessel Name: Magic Moment
Vessel Model: Mariner Orient 38 Euro
Join Date: Feb 2017
Posts: 56
Quote:
Originally Posted by Maerin View Post
Brass should be fine, although the state of California has determined that use of brass nipples will kill you and they've outlawed them. They use stainless there. So you could use brass or stainless if you're concerned about the brass. Since you're not generally drinking heated water, the exposure factor is minimal. Don't use plastic. Under uncontrolled conditions, the water heater can reach temps that will damage the plastic. CPVC has a higher temperature rating of 200F, inadequate for use as a nipple or direct tank connection. PVC is lower. Regardless of the technical details, it's simply inappropriate for that application. Brass, stainless, a PEX adapter, whatever. Many water heaters ship with a dielectric nipple, it's plated steel with a plastic liner, they work fine, and use of a CPVC adapter on that is OK, although I doubt that your vessel's fitted with CPVC, more likely PEX or some variation of polyethylene. So, brass is good!


Sound somewhat definitive. Dope instead of Teflon?
seabum is offline   Reply With Quote
Old 09-16-2019, 08:38 PM   #6
Guru
 
koliver's Avatar
 
City: Saltspring Island
Country: BC, canada
Vessel Name: Retreat
Vessel Model: C&L 44
Join Date: Nov 2007
Posts: 3,126
Quote:
Originally Posted by Maerin View Post
Brass should be fine, although the state of California has determined that use of brass nipples will kill you and they've outlawed them.
Only if you are a Californian. Though when I googled Prop 65, Brass didn't show up on the list of chemicals. I didn't see any other list.
__________________
Keith
koliver is offline   Reply With Quote
Old 09-16-2019, 08:57 PM   #7
Moderator Emeritus
 
ksanders's Avatar
 
City: SEWARD ALASKA
Country: USA
Vessel Name: LISAS WAY
Vessel Model: BAYLINER 4788
Join Date: Feb 2011
Posts: 4,410
The best thing to use is a stainless steel braid over whatever material flex line. These are what we use on residential water heaters.

This will extend the connection to wherever your more rigid plumbing happens to be.
__________________
Kevin Sanders
Bayliner 4788
Seward, Alaska
ksanders is online now   Reply With Quote
Old 09-16-2019, 09:30 PM   #8
Guru
 
bligh's Avatar
 
City: Santa Cruz, CA
Country: USA
Vessel Name: Frisky
Vessel Model: 99 Nordic Tug
Join Date: May 2013
Posts: 1,142
Bras brass brass. Lead free brass in California. Not stainless. Not plastic. Only brass.
bligh is offline   Reply With Quote
Old 09-16-2019, 09:48 PM   #9
Senior Member
 
johnma's Avatar
 
City: Philadelphia
Country: USA
Vessel Name: Dreamers Holiday
Vessel Model: Mainship 390
Join Date: Jun 2010
Posts: 457
I always used teflon tape, but i'm in the hydraulic industry and very used to using it. Teflon is very slippery and can easily allow you to overtighten the fitting and think its still loose. if your not sure how to use it use pipe dope.
John
johnma is offline   Reply With Quote
Old 09-16-2019, 10:20 PM   #10
Senior Member
 
Sabre602's Avatar
 
City: NW Washington State
Country: United States
Vessel Name: Kingfisher
Vessel Model: 37' converted gillnetter/crabber
Join Date: Oct 2017
Posts: 343
Brass, no question. Teflon tape; pipe dope is used for natural gas but not domestic water.
__________________
Anson & Donna

Be kind whenever possible. It is always possible. ~The Dalai Lama
Sabre602 is offline   Reply With Quote
Old 09-16-2019, 10:34 PM   #11
Senior Member
 
fractalphreak's Avatar
 
City: La Conner, WA
Country: United States
Vessel Name: Northwest Dream
Vessel Model: Davis Vashon 42 Trawler (Defever design)
Join Date: Jun 2018
Posts: 187
+1 on lead free brass. Turns out some is, some isn't. I learnt that here on TF. If it doesn't say it is it might not be.

The only time I would use plastic fittings is to put them into plastic. Plastic fittings into a plastic pump or tank, metal into metal, remembering about dissimilar metals in areas/fluids subject to electrolysis.

Plastic threads into metal will expand and contract at a different rate and over time will degrade until they basically shred and start to leak. The plastic fittings you will find at a hardware store (the most common are the shiny grey PVC fittings, less common are the translucent and limited selection of nylon) will not melt or even noticeably soften at the temps your hot water tank will see. They WILL expand and contract with that heat though. (If you're curious why, browse to this thread, post #3 Cure for minor fuel leak )

I use Rectorseal products for sealing threaded pipe. Rectorseal #5 on anything fuel or oil, and Rectorseal Tplus2 on anything potable. Its what works for me and I don't have leaks. Others use/prefer/are proficient with teflon tape and that works too.
__________________
"There exist minds that think as well as you do, but differently."
fractalphreak is offline   Reply With Quote
Old 09-17-2019, 05:17 AM   #12
Guru
 
Cigatoo's Avatar
 
City: Narragansett Bay
Country: New England
Vessel Model: Grand Banks 36
Join Date: Sep 2016
Posts: 791
Quote:
Originally Posted by seabum View Post
I have installed a new water heater and have researched many online place and talked to several plumbers, and still have no idea if I should use plastic or brass nipples for the fresh water connections, and even if I should use Teflon tape or pipe dope. What does the Forum recommend?
Brass nipples and stainless braid washing machine hose. Easy to remove and install / drain for whatever reason. All parts come from Home Depot or Lowe’s. Keep it simple.
Cigatoo is offline   Reply With Quote
Old 09-17-2019, 06:08 AM   #13
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 19,657
"stainless braid washing machine hose."

Great for vibration , fast hookup and easy to locate ,

BUT is it rated for potable water?

The HW heaters with engine coils will be engine coolant temp (180F+) after a while, perfect for instant coffee, hot chocolate and tea for non purists.

So HW may get consumed.
FF is offline   Reply With Quote
Old 09-17-2019, 06:33 AM   #14
Guru
 
Cigatoo's Avatar
 
City: Narragansett Bay
Country: New England
Vessel Model: Grand Banks 36
Join Date: Sep 2016
Posts: 791
“BUT is it rated for potable water?“
How about the hose to fill your tanks at the dock? Regardless as to who’s hose it is. (At least you’re own hose wasn’t stuffed into the holding tank pump out port....hopefully)

Sometimes we over think things. My 2 cents
Cigatoo is offline   Reply With Quote
Old 09-17-2019, 09:38 AM   #15
Moderator Emeritus
 
ksanders's Avatar
 
City: SEWARD ALASKA
Country: USA
Vessel Name: LISAS WAY
Vessel Model: BAYLINER 4788
Join Date: Feb 2011
Posts: 4,410
Quote:
Originally Posted by FF View Post
"stainless braid washing machine hose."

Great for vibration , fast hookup and easy to locate ,

BUT is it rated for potable water?

The HW heaters with engine coils will be engine coolant temp (180F+) after a while, perfect for instant coffee, hot chocolate and tea for non purists.

So HW may get consumed.
They make ones specifically for water heaters. Same stainless looking braid on the outside.

I have them on my boat, and probably the exact same thing on my house.

In some ways a boat is no different than a house, and the water heater connection is one of those ways.
__________________
Kevin Sanders
Bayliner 4788
Seward, Alaska
ksanders is online now   Reply With Quote
Old 09-17-2019, 12:11 PM   #16
Guru
 
Maerin's Avatar
 
City: East Coast
Country: USA
Vessel Name: M/V Maerin
Vessel Model: Solo 4303
Join Date: Jun 2013
Posts: 818
Quote:
Originally Posted by seabum View Post
Sound somewhat definitive. Dope instead of Teflon?
Lots of tradesmen use teflon then dope- "double doping" pick your favorite flavor.
__________________
Steve Sipe
Selene 4303 Maerin
http://maerin.net
Maerin is offline   Reply With Quote
Old 09-18-2019, 06:51 AM   #17
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 19,657
"Lots of tradesmen use teflon then dope- "double doping" pick your favorite flavor."

This is an extension of good past practice where cotton thread would be wound into the pipe threads , then pipe dope put on.

Usually considered necessary for gas lines , and a sign of excellent workmanship on water lines.
(Dad was a plumber).
FF is offline   Reply With Quote
Old 09-18-2019, 06:54 AM   #18
Guru
 
ben2go's Avatar
 
City: Upstate,SC
Country: USA
Vessel Name: Caroliner
Vessel Model: Selway-Fisher 45' Teign
Join Date: May 2012
Posts: 2,450
Brass and Teflon tape.
__________________

__________________
What a pain in the transom.

ben2go is online now   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 02:20 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×