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 plumbing a water heater ?
Author: cvcman (NY)

I am going to replace my 20 yr old elect waterheater. It has ss flex lines now going to threaded copper. Is this a good way to d the new one too ?? Reuse the flex or new ??

Also do I need dieelectric unions ?

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 Re: plumbing a water heater ?
Author: tato

always a good idea to replace supply lines, and if you don't install dielectric use brass nipples.

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 Re: plumbing a water heater ?
Author: cvcman (NY)

I have 1/2" copper then it goes to 3/4" threaded . Would i be better off just putting a threaded 3/4" dieelectric and leave the copper threaded on the supply lines and use ss felx hoses ?

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 Re: plumbing a water heater ?
Author: cvcman (NY)

I have seen others here say use a 3/4 x 6 " brass nipple. Now if I come out of the wh with the brass nipples and connect a copper nut to the supply end isnt that 2 dissimilar metals ??

Also where the nipple screws into the tank isnt that 2 dissimilar metals ??? I must be missing something

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 Re: plumbing a water heater ?
Author: cvcman (NY)

Also does the new water heater come with male threaded nipples ? I thought I have seen some that had like a red and blue plastic insert in them ?? Mine just look like aluminum straight thru nipples with no inserts in them ???

Thanks for the help !

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 Re: plumbing a water heater ?
Author: cvcman (NY)

Ok I guess the plastic insert things are heat traps.

Hers my ?

1) do I need the heat traps and any down side to using them ?

2) do the heat traps thread right into the tank or on top of a nipple ?

3) what should I use to thread into the tank, 6" brass nipple ?

4 My dissimilar metals questions above??

5) should I use braided ss flex lines or hard copper to connect ??

Thanks

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 Re: plumbing a water heater ?
Author: steve (CA)

1) do I need the heat traps and any down side to using them ?
If they're provided, use them. Otherwise use brass nipples.

2) do the heat traps thread right into the tank or on top of a nipple ?
They screw into the tank.

3) what should I use to thread into the tank, 6" brass nipple ?
See #1

4 My dissimilar metals questions above??
No problem with brass into the tank or copper to brass.

5) should I use braided ss flex lines or hard copper to connect ??
Your choice, flexible stainless, flexible copper or hard pipe(no copper to galvanized nipples-use brass nipples or at least brass unions to heat trap nipples).
Stay away from dielectric unions.

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 Re: plumbing a water heater ?
Author: LemonPlumber (FL)

whoo/twenty year old ss tubes.through them away .And hard pipe today.

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 Re: plumbing a water heater ?
Author: cvcman (NY)

the tank is 2o yrs old and the supply lines are ss braided waterheater flex and they are about 1o yrs old but I wouldnt use them over.So...if the new one comes with heat traps what material are they made of ??

If it doesnt come with them I assume by you saying use brass nipples that the heat traps are NOT that big a deal, correct ?

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 Re: plumbing a water heater ?
Author: PlumerDan (CA)

get the new corrogated waterflexs and put it in the way the old one was. should have 3/4 in and out to the house but until you need a repipe and have it ( the house) sized just use what you got....good luck

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 Re: plumbing a water heater ?
Author: cvcman (NY)

what do they look like ?? I will have to cut the 1/2" supply and solder on a 1/2 to 3/4 threaded on one supply to be able to use a 3/4 to 3/4 female threaded flex

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 Re: plumbing a water heater ?
Author: vic (CA)

I personally like corrugated stainless water heater flexes to connect from water heaters to copper, galvanized, or plastic piping:




[www.plumbingsupply.com]

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 Re: plumbing a water heater ?
Author: cvcman (NY)

here comes my disimilar metals ? again, ss to copper ????

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 Re: plumbing a water heater ?
Author: PlumerDan (CA)

ss is an inert metal,it does not react with other metals

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 Re: plumbing a water heater ?
Author: hj (AZ)

All installations of dissimilar metals are NOT problematic. The specific dissimilar metals is what causes the problem. The new heater will have preinstalled nipples and you do NOT change them to brass. The majority of "flexible connections" ARE intrinsically dielectric so you do not need any additional ones. (They don't work and are just cosmetic anyway.)

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 Re: plumbing a water heater ?
Author: cvcman (NY)

didnt know they came with the nipples. Again the heat traps are not really needed then . Question, I have an 80 gallon elect model now that is on a day/night meter so it only comes on during the evening. There are 2 of us in the house and this works fine.

IF and I do mean IF I chg this to a regular 40 gallon on a day meter would it cost me more to run ?

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 Re: plumbing a water heater ?
Author: hj (AZ)

Of course, but a 40 gallon electric heater is absolutely worthless for most applications. I would not use less than a 50 gallon, but with a night demand meter, a 50 gallon would not store enough hot water to get through a day before it went cold.

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 Re: plumbing a water heater ?
Author: cvcman (NY)

so... are you saying stay with the 80 gallon day night over a 50 gallon day ??

Also compare the above to a power vent natural gas water heater

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 Re: plumbing a water heater ?
Author: cvcman (NY)

also where do you buy the ss flex ?? looked at Home Depot all they had were copper

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 Re: plumbing a water heater ?
Author: hj (AZ)

The electric bill will be sustantially less. Gas is always better than electic, unless you live in an area, such as the TVA, where rates are highly subsidized.

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 Re: plumbing a water heater ?
Author: cvcman (NY)

Ok but the power vent water heater is easy double the cost of the gas 80 gallon. How much would you assume I would save over being on the night meter ??

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 Re: plumbing a water heater ?
Author: hj (AZ)

I don't know what propane, or electricity, costs in your area, so it is impossible to calculate it. ANd why would you need a "power vent" model?

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 Re: plumbing a water heater ?
Author: cvcman (NY)

well I dont have a spot to put it in next to a wall for the DV and I dont want it going thru the roof. I have had electric for 24 years

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 Re: plumbing a water heater ?
Author: cvcman (NY)

its NG not propane. I think im at 1.25 per therm and around .08 kh for electric at night

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 Re: plumbing a water heater ?
Author: LemonPlumber (FL)

The heat traps provided are just a manufacturers end/to get energy rating,s to extend.the plastic lined nipples do work to stop some hard water quirks.but only at the small side would they be called worth. some now make the male as the anode too.Read the product that you buy and see what they say.but call customer tech and ask them to explain.As said use new ss flex and connect.

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 Re: plumbing a water heater ?
Author: cvcman (NY)

where can I buy the ss flex ?? I didnt see them at Home Depot

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 Re: plumbing a water heater ?
Author: hj (AZ)

Must not be a very good HD store, since all of them around here sell them.

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 Re: plumbing a water heater ?
Author: cvcman (NY)

you dont mean the braided style right ? I will check Lowes tomorrow why are the ss better than the copper ?

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 Re: plumbing a water heater ?
Author: PlumberManDan (IA)

You can buy the SS flex at the sponsors website PlumbingSupply.com, I use either full SS mechanical or CU Sweat/SS mechanical

PlumbCat TM 2003


Plumbermandan

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 Re: plumbing a water heater ?
Author: cvcman (NY)

not sure what either of those are. pls explain, thx

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 Re: plumbing a water heater ?
Author: LemonPlumber (FL)

Twenty posts above with love!

Post Reply

 Re: plumbing a water heater ?
Author: steve (CA)



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Edited 1 times.

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