I am not worried about full 60psi pressure for a 30 minute shower party with 6 friends.
OK, I know you think I am just trying to sell you one of these.
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And I am. But it is not because I desperately need a couple hundred bucks right quick. Or, that I even make a couple hundred bucks on a $500 kit. Lol! I could make a lot more money selling things like 119 gallon pressure tanks for a thousand bucks and VFD's for several thousand to people who think they need them, but then I couldn't sleep at night. I get accused of telling long stories, but I am just trying to give people the benefit of over a half century of working on pumps and wells.
Here is the long story. As a pump man when the phone rings, you know someone is mad and out of water. Normally they are standing in the shower with soap in every orifice, and the water SUDDENLY stopped coming out of the wall. No warning!
That is because pumps nearly always fail on start up, and a tank with 38 PSI air charge is completely out of water when that diaphragm hits the bottom at 38 PSI. It is not a gradual loss of pressure, it is instant. Even if you haven't flushed the toilet or anything during the night and the tank happens to be full, you won't know the pump is not going to start until you use all the water in the pressure tank. May not be a problem for the first person to take a 15 gallon shower, but the second person ain't gonna be happy. My advice is always to dip some water out of the back toilet tank with a cup to get the soap out of their eyes, and wait for my service truck to show up in a day or three. Although, I will have to work them in when i can because I have months worth of work already scheduled.
Being a pump man is not a fun job. Nobody wants to hear you can't be right over and they throw a fit over how much it will cost. But it is not good for me that they started the day with soap in their hair they can't get out. Lol!
That is why I always say you want to make sure the pump is running before you get in the shower. You are much less likely that the pump will fail while it is running and more likely to get the soap washed off if you make sure the pump is running before getting in the shower. The best way to do that is to use a small pressure tank. I use a 10 gallon size tank with my 2HP, 25 GPM pump. The tank only holds 2 gallons of water. But just like the 119 gallon tank is not likely to have 30 gallons in it when you get in the shower, my 10 gallon tank is not likely to have the whole 2 gallons it is when I start the shower. With my 3 GPM shower head I may have to wait for 30 seconds before the pump starts, but usually not. Never the less I will stand there and wait until I see the lights flicker, which means the pump started. Then I instantly see the change to strong constant pressure in the shower and I know it will be that way for 5 minutes or 30 minutes. Heck it will stay strong and constant for a month or a year if I decide to shower for that long, because pumps are made to run continuously 24/7/365, it is the cycling on and off that kills them. I have a pump feeding a stock tank that hasn't shut off since 1999.
Oh, and I should say the small tank will not work without a Cycle Stop Valve. Without the CSV the small tank would cause the pump to cycle on and off multiple times during a shower, giving the pump multiple opportunities to fail and multiply the chances you won't get the soap out of your hair. Lol!
I know our brains tell us the larger the pressure tank the better. But this is one of those things that is truly counter intuitive.