Empty conduits on the property - ideas? - It's not too late yet :)

There are various online shops that sell Hunter products, e.g. DVS-Beregnung or Beregnungsparadies.

How many zones you need and where depends on your property, the planting, and your max flow rate.
Take a look at Hunter’s homepage under operating data. Subtract a little from the throwing distance.
For example, with the MP2000 you calculate with 5 meters throwing distance, meaning one sprinkler every 5 meters so they overlap.
Depending on the head and angle used, you will have a specific flow rate per hour.
It’s best to take a plan of your property and start placing the sprinklers in one of the corners. From there you continue. For drip irrigation (bushes, hedges...) or root irrigation (bubbler) for trees you also need extra zones. When you have drawn all the sprinklers etc. you create a table with all the types and flow rates per hour.
Now you put together the zones sensibly, meaning areas and your max 2 m3/h.
You might also want to connect two watering cans (2 extra zones).
For the distribution boxes it depends on whether you want to tinker or buy ready-made.
Use the Hunter PVG (25mm 3/4") valves.
Your estimate of the number of zones is probably way too low. This is due to the low flow rate.
This then also determines the number of boxes and how many valves are needed per box.
DVS offers ready-made boxes including compressed air connection.
With watering cans, drip irrigation, and lawn, I estimate that you will need about 12 zones.

The hedge irrigation from Hunter or Rainbird is at least as good as Gardena. And especially robust.

However, you have extra effort despite having KNX.
The valves run on 24V AC. KNX actuators with supply at 24V DC.
Therefore, you only need a switching actuator with e.g. 12 channels as well as an additional transformer with 24V AC.
That is usually more expensive than a Hydrawise irrigation computer with 12 channels.
Please consider that you still need control lines (number of wires = valves + 1) from the distribution boxes to the computer or actuators. These must definitely be laid in protective conduits.

Yes, water meter in 25mm because you then have more flow.

If you post your entire property and also mark the hedges and bushes, I can help you a bit with the planning.

what is better about Hunter than Gardena?

Best regards
Sabine

I wrote at least just as good with drip irrigation.
With sprinklers, Gardena, however, is child's play. Both in terms of options and durability.
Have you ever seen a Gardena gear sprinkler with a 15 meter range and a 5 m3/h flow rate?
Comparable sprinklers from Hunter or Rainbird are even cheaper than Gardena.
There are good reasons why many start with Gardena and switch after at most two years.
Hunter or Rainbird are simply for professional use and can be better adapted to the conditions thanks to the available options.
The better is the enemy of the good. There are certainly many who are satisfied with their Gardena system as well.
In a new build and if you really deal with the topic, Gardena is out of the question for irrigation right away.

Is there anything comparable from Hunter like the OS 140 (Gardena)? For example, I have relatively many square areas, which means I would need 4 sprinklers from Hunter instead of one OS140

there is nothing exactly comparable. And there are several reasons for that. Have you already looked more closely at the sprinkler? The experiences are quite mixed. My sister had 3 pieces (OS140) and other Gardena sprinklers on the property. 2 were already replaced because they were defective. Now two are defective again... One of the reasons why we are now doing it "properly" for her as well. Additionally, it is also very susceptible to wind. Hunter or Rainbird also have rectangular sprinklers but rather for smaller areas. The problem with most sprinklers is that the precipitation amount is not distributed homogeneously. At the sprinkler itself and at the end of the throw distance you have less precipitation. Hence also the issue with overwatering. The Hunter Rotator is very homogeneous in distribution. Rainbird has a similar product. With the pressure-compensating housing and regardless of which head you use, you always get an even amount of precipitation (whether 360°, 90°, 3 meters throw distance, or 9 meters throw distance...). The pipes from Gardena are more expensive and worse (softer) than potable water PE pipes. The fittings are also overpriced for the quality. Everyone knows Gardena because it is available everywhere. In the end, you have to decide for yourself. I am not saying that you can’t be happy with it. But I would clearly recommend Rainbird or Hunter. Several sprinklers also give you more adjustment options (e.g. shaded areas, etc.). The additional effort for a new garden installation is also manageable.

There are different online shops that sell Hunter products, e.g. DVS-Irrigation or Irrigation Paradise.

How many zones you need and where depends on your property, the planting, and your max flow rate.
Take a look on Hunter’s homepage under operating data. You subtract a little from the throwing distance.
For example, with the MP2000 you calculate with a 5-meter throwing distance, meaning one sprinkler every 5 meters so they overlap.
Depending on the head and angle used, you then have a specific flow rate per hour.
The best is to take the plan of your property and start the sprinklers in one of the corners. From there you continue.
For drip irrigation (bushes, hedges...) or root watering (bubbler) for trees you also need separate zones.
When you have marked all sprinklers etc., create a table with all the types and the flow rates per hour.
Now you combine the zones sensibly, i.e. areas and your max. 2 m3/h.
You might also want to connect two watering cans (2 extra zones).
Regarding the distribution boxes, it depends on whether you want to tinker or buy ready-made.
Use the Hunter PVG (25mm 3/4") valves.
Your estimate of the number of zones is probably much too low. This is due to the low flow rate.
This also determines the number of boxes or how many valves per box are needed.
At DVS there are ready-made boxes including compressed air connection.
With watering cans, drip irrigation, and lawn, I estimate you will need about 12 zones.

The hedge irrigation from Hunter or Rainbird is at least as good as Gardena. And above all, robust.

However, you have extra effort despite existing KNX.
The valves run on 24V AC. KNX actuators are powered with 24V DC.
Therefore, you only need a switching actuator, e.g. with 12 channels, plus an additional transformer with 24V AC.
This is usually more expensive than a Hydrawise irrigation computer with 12 channels.
Please keep in mind that you also need control cables (number of cores = valves + 1) from the distribution boxes to the computer or the actuators. Be sure to lay these in protective conduits.

Yes, water meter in 25mm as you then have more flow.

If you post your entire property sometime and also mark the hedges and bushes, I can help you somewhat with the planning.

Thank you for the offer! I have attached my property.