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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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

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

Product ID: 271101577

Details

Brand
Goulds
Colour
Blue
Material
Cast Iron
Power source
Ac
Style
Circulator

⚡1.5 HP Power Boost

💧Self-Priming Water Flow

🛡️Built-in Overload Protection

R54168

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Pump up your garden game with unstoppable flow!

COMPACT YET MIGHTY - Space-saving dimensions with high-pressure capacity up to 125 PSI.
SELF PRIMING DESIGN - Starts pumping without manual priming—effortless and efficient.
POWERFUL 1 5 HP MOTOR - Delivers robust water transfer for all your irrigation needs.
DURABLE CAST IRON HOUSING - Built to last with corrosion-resistant, heavy-duty materials.
BUILT IN OVERLOAD PROTECTION - Automatic reset safeguards your pump from electrical damage.

The GT15 IRRI-Gator is a 1.5 HP single-phase centrifugal pump by Goulds, featuring a self-priming mechanism and durable cast iron construction. Designed for irrigation and water transfer, it operates on 230V with built-in overload protection and supports liquid temperatures up to 140°F and pressures up to 125 PSI, making it a reliable powerhouse for professional-grade water management.

Specifications

ASIN	B00S2C34E2
Brand	Goulds
Brand Name	Goulds
Color	Blue
Colour	Blue
Global Trade Identification Number	00697666117120
Horsepower	1.50
Item Dimensions L x W x H	53.3L x 20.3W x 23.9H centimeters
Item Weight	60 Pounds
Manufacturer	Goulds Pump
Manufacturer Part Number	GT15
Material	Cast Iron
Material Type	Cast Iron
Model Number	GT15
Power Source	Ac
Power source	Ac
Product Style	Circulator
Product dimensions	53.3L x 20.3W x 23.9H centimeters
Specific Uses For Product	Irrigation, Water Transfer
Style	Circulator
UPC	697666117120 094700753489
Voltage	230 Volts

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