new water pump for two story house. Why no tank

johne

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Jun 28, 2003
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I had a new water pump installed while i am here in US for the weekend. My wife sent me a picture and I see the small tank we had before is missing. Her answer was this is more up to date pump and no tank is necessary. Is this correct?
 

XTraveller

Well-known member
Aug 21, 2010
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Can you post a picture. I seen (not here) water pumps that now have some kind of electronic control ( not your usual pressure switch and tank).
Would like to know if this maintains constant pressure? When you start using it can you give us feedback.
 

JD Jones

Moderator:North Coast,Santo Domingo,SW Coast,Covid
Jan 7, 2016
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Some pumps come with a small tank mounted on the top similar to this:

davey-xp25p8-xp35p8-xp45p8.jpg
.

They're not very efficient and only serve to avoid the pump cycling on and off every time somebody opens a faucet.

Most pumps come without the tank and need to have a pressure tank mounted somewhere after the output from the pump. Most of them are installed close to the pump, but I have also seen them installed in a different location in the house.

Diaphragm tanks are preferred since they do not fill up with water after a while which causes the pump to cycle on and off as well.
pressure-tank-drawings-300.gif
 

johne

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Jun 28, 2003
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Can you post a picture. I seen (not here) water pumps that now have some kind of electronic control ( not your usual pressure switch and tank).
Would like to know if this maintains constant pressure? When you start using it can you give us feedback.
Will post a picture later today.
 
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sosuadr

Member
Aug 17, 2014
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Without a tank your pressure is constant, turn on the water he pump turns on. (also less to repair and replace)

Old systems have a tank and a pressure switch 30/50 psi or 20/40 psi so that when the tank is full you get 50psi but as you use it the pressure drops to 30psi before the pump starts up again so it always fluctuating.. lots of pressure at first then less then jumps back up.
 

sosuadr

Member
Aug 17, 2014
52
29
18
Can you post a picture. I seen (not here) water pumps that now have some kind of electronic control ( not your usual pressure switch and tank).
Would like to know if this maintains constant pressure? When you start using it can you give us feedback.
Yes thats right constant whatever the pump provides.
 

JD Jones

Moderator:North Coast,Santo Domingo,SW Coast,Covid
Jan 7, 2016
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Without a tank your pressure is constant, turn on the water he pump turns on. (also less to repair and replace)

Old systems have a tank and a pressure switch 30/50 psi or 20/40 psi so that when the tank is full you get 50psi but as you use it the pressure drops to 30psi before the pump starts up again so it always fluctuating.. lots of pressure at first then less then jumps back up.
You're aware you can adjust those limits, right? If you want 40/50 it's possible, or any other combo.
 

Liberator

Luck is for the unprepared
Jan 23, 2021
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I had a new water pump installed while i am here in US for the weekend. My wife sent me a picture and I see the small tank we had before is missing. Her answer was this is more up to date pump and no tank is necessary. Is this correct?
I've recently (3 weeks ago) have a pressure-pump installed. It's without the tank and directly connected to the watertank which is located on the roof. Indeed with constant (not changing) pressure.
 

Liberator

Luck is for the unprepared
Jan 23, 2021
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I want to buy one also. I'm tired of the fluctuating pressure of a bladderless tank. Find out where the purchased it and the make and model. Is it 110 ?
This is the model which my plomer advised to us:
bomba ladrona APm37, 110V (available at Almacenes Unidos)
 

johne

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Jun 28, 2003
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CB
I'm new to the whole process of "water" in a house as this is my first renovation. Bought this house with intent to do first class renovation and started with taking down a wall which went great..so far. Kaboom. Electric is on the top of agenda and now working working "temporary " electric service as I got tired of waiting for service which I opened a month ago and never got. Friends said "no problem, this is DR the home of AI. Had power next day.
I'm anxious to get back Tues AM and will give you as much info as I know then.
 

JD Jones

Moderator:North Coast,Santo Domingo,SW Coast,Covid
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This. Renovating entire house.
Either there is a tank somewhere else in the house, or the pump turns on every time you open a faucet.

That looks like a 1.25 or 1.5 pump, and I'm guessing it's set up to turn on every time you open a faucet, which can be done with a larger pump that produces enough pressure.
 

johne

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Jun 28, 2003
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Either there is a tank somewhere else in the house, or the pump turns on every time you open a faucet.

That looks like a 1.25 or 1.5 pump, and I'm guessing it's set up to turn on every time you open a faucet, which can be done with a larger pump that produces enough pressure.
In summary JD is that set up good or can be improved upon?
 

JD Jones

Moderator:North Coast,Santo Domingo,SW Coast,Covid
Jan 7, 2016
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In summary JD is that set up good or can be improved upon?
I would leave it like that until it quits working unless you are not happy with the water pressure in the house. I would have to see the pressure to decide if I would install a bladder tank.

I would also install a Tinaco on the roof for water when the electricity goes off unless you have a generator.
 

johne

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Jun 28, 2003
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I would leave it like that until it quits working unless you are not happy with the water pressure in the house. I would have to see the pressure to decide if I would install a bladder tank.

I would also install a Tinaco on the roof for water when the electricity goes off unless you have a generator.
THANKS. There is a small tinaco on the roof which I haven't attended to yet. I have very little flat part on the roof as there are several angles and pitches to the roof. In addition I don't have access from the second floor. Only outside ladder. My plan was to deal with the roof and tinaco when the painter starts the exterior next week.
 

JD Jones

Moderator:North Coast,Santo Domingo,SW Coast,Covid
Jan 7, 2016
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THANKS. There is a small tinaco on the roof which I haven't attended to yet. I have very little flat part on the roof as there are several angles and pitches to the roof. In addition I don't have access from the second floor. Only outside ladder. My plan was to deal with the roof and tinaco when the painter starts the exterior next week.
Remember to confirm the float is functioning correctly while you're up there. Even the smallest leak will have the pump cycling on and off.
 
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