Well pump

If you say so... Grundfos works for us.

Which type of pump depends on the pipe. If it is, for example, a 1 ¼ inch metal pipe, you will need a suction pump. If it is usually a plastic pipe with a diameter of 110mm or more, then it is better to use a submersible pump. Whether the system needs to be completely or partially dismantled in winter depends on where the pump and also the pipe are located. Since the pipe and also the valve will certainly be at least partially exposed to frost, it must be drained.

You can easily determine the depth of the well and the height of the water level yourself. Needed are a string, a nut or any other heavy object, something light, e.g., the cork of a wine bottle, and a folding ruler or something similar.

Tie the nut to the string once and lower it into the pipe until it reaches the bottom, then you can measure how many meters deep the well is. Then tie the cork to the string and do the same again, then you will know where the groundwater currently begins in your well. The difference between the well depth and the water surface is then the available water column.

Even if the water column is high, it does not mean that you will not have problems with the water supply. Because it could be that your pump extracts more water than can flow back in. Or the water level is so low that a suction pump can no longer properly pump water.

If you say so... Grundfos works for us.

Then you have a well or deep well pump. These usually deliver smaller flow rates but can achieve higher delivery heights. The disadvantage of a well pump is the price. It costs about ten times as much as a submersible pump. For the construction phase, you could use a suction pump, provided the well depth is suitable and, as Gartenfreund wrote, enough water flows back into the well. Or you do it properly right away and get a well pump.

Good day,

I am bringing up the topic because we are currently focusing on well construction as well.
We want to purchase a deep well pump, but unfortunately, I am a bit unsure which pumps are common.
The company Grundfos was recommended to us. I have looked at a few pumps there, but I would like to have some experience-based advice.

We have the "well water" at a depth of 7m (max. 10m).
Which model would you recommend?

First of all, hello and welcome to the forum.

I myself only know one, and that is the one that was sunk in the pipe about 4 decades ago. According to the nameplate which the well builder attached here, it is also a Grundfos. To be exact, an SP4-13 with a max. of 5 m³/h and 380 volts, today that would be 400 volts. It still runs perfectly.

Regarding the well itself, I would advise not to choose the pipe too small. You sometimes read that a pump only requires a pipe diameter of 110 mm. But I would prefer to have something with 150 or 200 mm installed. And also better to drill 3 meters deeper than just barely enough to reach water.

For us, water comes at about 7 meters, but drilling was done to 15 meters. And the pump hangs (here I have to estimate a bit) at 13 meters.