Question 1

What pressure will this pump supply trying to decide if it will work for my sprinklers

Accepted Answer

The water supply pressure of the pump is the head Hmax 8m divided by 10=0.8bar

Question 2

What is the watts?

Accepted Answer

about 700 watts

Question 3

What size circuit breaker should you use and should it be dedicated for the pump only?

Accepted Answer

This is a 120volt pump and it indicates as a 1HP motor. If you do the electrical conversion it comes out to approximately 746watts. Another person posted this unit is approximately 700watts. 
Either way, a 15amp residential circuit breaker will be more than adequate. If you are in a commercial setting, a commercial circuit breaker at 20amps is also more than adequate. 
Here is how to convert so you will know for anything electrical in the future. 
746watts / 120volts = 6.22 amps
700 watts / 120volts = 5.83amps

Max circuit breaker load as follows 
15amps x 80% = 12amps max on a 15amp circuit.
20amps x 80% = 16amps max load on a 20amp circuit.

You can never exceed 80% of the circuit breaker.

So either way, 15amp residential circuit breaker is fine for this, especially if you are going to dedicate this circuit for the pump.

If you are sharing the circuit with other loads, it is recommended you turn off whatever else you have plugged into the 15amp circuit. 
Remember, your maximum load can’t exceed the total of 12amps on that circuit. 
Same goes for the 20amp circuit breaker.

Also, please take note that a 15amp residential circuit will typically have #14 AWG size wire (THHN insulation) used for that circuit wiring.

A 20amp circuit will typically use #12 AWG size wire.

Depending on the length of the circuit, the wire could be larger, but these are typically what us used.

Anyway, it’s a lot of information, but this will help you sizing other circuits and appropriate size wire too.

I try to pass along helpful information when I can

Question 4

With Adapter down to 3/4. No hose works fine, blows a ton of water..Put the 3/4 hose on and no pressure?

Accepted Answer

If you using the pump to remove water I would recommend getting a pool drank hose and use a hose clamp to secure it.  Hope this helps

ASIN	B08CKDFPKF
Best Sellers Rank	#34,061 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #33 in Sump Pumps
Brand Name	Prostormer
Color	Orange
Customer Reviews	4.2 4.2 out of 5 stars (2,454)
Flow Rate	62 Gallons Per Minute
Global Trade Identification Number	08414877520608
Horsepower	1 Horsepower
Included Components	pump
Item Dimensions L x W x H	6.69"L x 6.69"W x 12.2"H
Item Type Name	sump pump
Item Weight	10 Pounds
Manufacturer	Prostormer
Manufacturer Part Number	water pump for pool draining
Material Type	Plastic
Maximum Lifting Height	26 Feet
Model Number	Prostormer Submersible Sump Pump
Power Source	Corded Electric
Product Style	1HP Submersible Sump Pump
Unit Count	1.0 Count
Voltage	120 Volts

Prostormer 1HP 3700GPH Submersible Sump Pump with Automatic Float Switch | Orange Water Pump, Draining Transfer Clean & Dirty Water, for Pools/Ponds/Gardens/Flooded Cellars/Aquariums/Irrigation

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