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 Plumbing help
Author: K5BEAST (ID)

I live off grid. I'm not a plumber by trade but am a seasoned construction worker.

I currently have a storage tank that i fill. Water is moved via a 12v pump. I utilize a 38gal pressure tank running at around 50psi line pressure. It feeds a tankless water heater which feeds a shower and sink. All works fine.

I adding a new master bathroom located level with the pressure tank but about 6ft above the water heater. The master bath will have a toilet, vanity, and a walk in shower incorporating rain fall head, hand held, and 6 body sprays. I'm worried that the water pressure won't be adequate in the new bathroom. How can i raise the water pressure for just the new bathroom?

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 Re: Plumbing help
Author: bernabeu (SC)

not practical

the added bath should be 'conventional' with water saving fixtures

your 'problem' is/will be gpm used by shower NOT pressure as the elevation is the same as the tank


1 gal = 8.334#

assuming tank temp = 60 degrees (average due to Idaho) and desired hw temp = 120 (allowing for mixing at tap)

1 gpm = 8.334 X 60 btu/min = 500.04 btu/min = 30,002.4 btu/hr

that is ONE gallon of hot water per minute

? you are off grid ?

- - - -

Retired U.A. Local 1 & 638
"Measure Twice & Cut Once"



Edited 1 times.

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 Re: Plumbing help
Author: packy (MA)

i'm not great at this but i know you will need 3/4 inch to feed the new shower.

i'm guessing a second pump working in parallel with the first pump will help greatly.

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 Re: Plumbing help
Author: LI Guy (IN)

Look at the the GPM ratings for all those fixtures, your problem is going to be volume, not pressure. You're going to need 3/4 pipe minimum all the way from the tank to the fixtures, will your tankless HWH keep up, and how fast will you drain your supply tank? That's a pretty luxe setup for off the grid LOL.

I would stick with the low volume water saving fixtures, or at a minimum go with a really nice massaging shower head and skip the body sprays and rainfall

- - - - - - -

Not a plumber by trade but a fierce DIYer

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