looking to pump water from a rain barrel at ground level to flush toilets on 2nd floor of home. will this do the job

Overkill, you don't need that much power.

Can this pump irrigate 3.4'' pipe at 300' at 25' rise?

Not recommended.The GT15 pump has a 1-1/2" discharge. Designed for large volume flow.Reducing to 3/4" creates WAY TOO much back pressure for this pump. (Back pressure creates HIGH Total Dynamic Head - TDH)In your scenario, Let's say your irrigation system requires a flow rate of 15 GPM @ 35 psi @ 300 ft away from pump Running 15 GPM thru 3/4" pipe for 300 ft = ~130 ft TDH (Pressure Loss = 56 psi)Plus the 25 ft rise (Pressure loss = 11 psi)And let say you want 35 psi (Higher PSI = Higher TDH) = ~80 ft TDH (Pressure Loss 35 psi)That said, you would need a pump that can operate upwards of 235 TDH (Pressure loss to overcome = 102 psi)The GT15 has a MAX TDH of ~120 ft TDH (or ~ 52 psi) Don't use this pump for your system...it will not work.

is it possible to over-work this pump by not having enough sprinklers in a zone?

No the problem on pumps is typically when you over flow them (too many sprinklers) and the motor draws more amps. Also cycling the motor on/off is not good for the motor life.

I’m replacing a sta-rite ds3hf-01 1.5hp, would this be the correct replacement pump?

Yes these have similar pump curves.

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💪 Power Meets Precision: Elevate Your Pumping Game!

BUILT TO LAST - Crafted from durable cast iron, this pump is designed to withstand the test of time and resist corrosion.
FDA COMPLIANT - Rest easy knowing that our FDA compliant impeller meets the highest safety standards.
COMPACT POWERHOUSE - With dimensions of 55.88 x 22.86 x 25.4 cm, it fits seamlessly into your workspace without compromising on power.
CONTINUOUS OPERATION - Engineered for relentless performance, this pump is ready to work as hard as you do.
UNMATCHED EFFICIENCY - Experience a powerful flow rate of 64 gallons per minute, ensuring your operations run smoothly.

The Goulds Water Technology Centrifugal Pump (1.5Hp) is a robust, self-priming solution designed for continuous operation. With a flow rate of 64 gallons per minute and FDA compliant components, this corrosion-resistant pump is perfect for professional environments demanding reliability and efficiency.

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Manufacturer	Goulds Water Technology
Part Number	GT15
Product Dimensions	55.88 x 22.86 x 25.4 cm; 27.22 kg
Item model number	GT15
Colour	Blue
Style	Protection
Material	Cast Iron
Power Source	Ac
Voltage	230 Volts
Horsepower	1.50
Item Package Quantity	1
Flow rate	64 Gallons Per Minute
Batteries included?	No
Batteries Required?	No
Item Weight	27.2 kg

Pump, Centrifugal, 1.5Hp

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