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?

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 ?

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



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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.

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

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Not a plumber by trade but a fierce DIYer

To increase the water pressure, use a water pump. If you use a 12-volt pump, it's not that difficult. It'll work with any other 12 or 6-volt pump. If you want to use a pump with a higher capacity than the tank pump, you'll have to add a water pump to the tank to help it. You can do this by adding an extra pump to the tank, which is a good way to control water flow and increase performance. The water pump will increase the flow of water from the tank to the water heater and from the water heater to the shower.



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