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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Goulds Pump s GT15 Irri-Gator Self-Priming Centrifugal Pump Single Phase, 1.5 HP

Goulds Pump s GT15 Irri-Gator Self-Priming Centrifugal Pump Single Phase, 1.5 HP

Product ID: 332678098

Details

Brand
Goulds
Colour
Blue
Item weight
60 Pounds
Material
Cast Iron
Maximum flow rate
64 Gallons Per
Maximum lifting height
25 Feet

⚡1.5 HP Power Boost

💧64 GPM High Flow Rate

🛡️Corrosion-Resistant Cast Iron

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553886 som

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Description

💧 Pump Up Your Efficiency with Goulds GT15!

BUILT TO LAST - Durable cast iron housing and FDA-compliant impeller ensure long-lasting corrosion resistance and safety.
SMART SAFETY FEATURES - Includes built-in overload protection with automatic reset for peace of mind during heavy-duty use.
EFFORTLESS SELF PRIMING - Advanced self-priming design means no manual priming—get water flowing fast and hassle-free every time.
OPTIMIZED FOR EFFICIENCY - Handles up to 64 gallons per minute with a max casing pressure of 125 psi—perfect for professional-grade performance.
POWER THROUGH YOUR PROJECTS - Robust 1.5 HP motor delivers reliable, continuous operation for all your irrigation and water transfer needs.

The Goulds GT15 Irri-Gator is a powerful 1.5 HP single-phase centrifugal pump designed for continuous, efficient water transfer. Featuring a self-priming mechanism, corrosion-resistant cast iron housing, and FDA-compliant impeller, it delivers up to 64 gallons per minute at 125 psi. Built-in overload protection ensures safe operation, making it the go-to choice for professional irrigation and booster pump applications.

Specifications

ASIN	B00S2C34E2
Brand	Goulds
Colour	Blue
Flow Rate	64 Gallons Per Minute
Global Trade Identification Number	00697666117120
Horsepower	1.50
Item Dimensions L x W x H	55.9L x 22.9W x 25.4H centimetres
Item Weight	60 Pounds
Manufacturer	GOULDS PUMPS
Material	Cast Iron
Maximum Lifting Height	25 Feet
Model Number	GT15
Part Number	GT15
Power source	Corded Electric
Product Style	Protection
UPC	697666117120 094700753489
Voltage	230 Volts

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