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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💧 Pump up your productivity with unstoppable flow!

BUILT TO LAST - Corrosion-resistant BUNA elastomers and stainless steel ensure durability in harsh environments.
COMPACT YET MIGHTY - Space-saving design with a robust 64 GPM flow rate and 25-foot lift capacity.
CONTINUOUS POWERHOUSE - 1.5 hp motor designed for nonstop operation—perfect for demanding irrigation needs.
FDA COMPLIANT IMPELLER - Safe and reliable performance with FDA-approved materials for peace of mind.
EFFORTLESS SELF PRIMING - Start pumping instantly without manual priming—time saved, stress avoided.

The GOULDS GT15 IRRI-Gator is a self-priming, single-phase centrifugal pump featuring a 1.5 hp motor, capable of delivering up to 64 gallons per minute with a 25-foot lift. Constructed from corrosion-resistant materials including BUNA elastomers and stainless steel, it supports continuous operation and includes an FDA-compliant impeller for reliable, long-lasting irrigation performance.

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Brand	Goulds
Colour	Blue
Material	BUNA Elastomers, Carbon, Cast Iron, Ceramic, Stainless Steel
Item Weight	60 Pounds
Maximum Flow Rate	64 Gallons Per Minute
Maximum Lifting Height	25 Feet
Voltage	230 Volts
Global Trade Identification Number	00697666117120
Manufacturer	GOULDS PUMPS
UPC	697666117120 094700753489
Item model number	GT15
Product Dimensions	55.88 x 22.86 x 25.4 cm; 27.22 kg
ASIN	B00S2C34E2

GOULDS Pumps GT15 IRRI-Gator Self-Priming Single Phase Centrifugal Pump, 1.5 hp, Blue

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