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- over 450,000 plumbing related posts
The very popular general plumbing, toilets, sinks, faucets, pump problems, questions and answers discussion Forum
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Author:
ddave51 (NC)
If I add a second water heater next to the existing one which is better, In-line or parrallel? It's in the corner of the garage with plenty of room to move pipes as needed.
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Author:
LemonPlumber (FL)
In line one to preheat and the second to raise temp for use.It is difficult to set the parallel ones up so the water is drawn equally.Note this type install may void the heaters warranty.use a larger tank as pre teat and smaller one as delivered temp. possibly a solar prep and 20 gallon delivery.
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Good Luck. Insulate your hot piping, although costly, it will pay you back every day.
Edited 1 times.
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Author:
North Carolina Plumber (NC)
When I need to connect 2 water heaters I normally parallel pipe them. The heaters need to be the same size, and the piping needs to have the same spacing between the tees. One advantage is that if one heater starts leaking you can valve it off and still have hot water from the other heater. Not so if you connect them in series.
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Author:
joe plumber (NE)
I always parallel them,takes a little longer to install.
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Author:
Shoemaker2 (MA)
Also when High demand lessens you can shut one off so you burn less fuel.
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Author:
hj
quote; Note this type install may void the heaters warranty.
It has NOTHING to do with the warranty. But in series is the only way you can be sure to get ALL the hot water from both tanks, assuming you set both of them to the same temperature. Also, the two tanks do NOT have to be the same make, model, size, or age.
Edited 2 times.
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Author:
hj
In series, all you have to do is shut off the first one, and it accomplishes the same thing. Also, if you really want to, you can valve a series installation so you could isolate either tank. With a series system, you may go through several "first" heaters to one second one. Parallel, they may fail simultaneously, but even if they do not you may have to replace both to maintain the parallel "mirror image" with a new design.
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Author:
packy
3 votes for parallel and 3 votes for series.
one more each and we'll have a tie.
i vote for parallel..
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Author:
dlh (TX)
my vote is for series
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PLUMBERS "Protecting The Health Of The Nation"
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Author:
hj
You probably also voted Democratic.
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Author:
steve_g (CA)
I vote tankless.
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Author:
hj
A voice crying in the wilderness.
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Author:
Nayman's Drain Services (Non-US)
in Holland they were using on-demand heaters above every sink when I lived there. (40 years ago)
Now, On-demand has gone hitech when all one has to do is look at the old fashioned way, and forget all the electronic BS
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