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
16.78 kg
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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Description

💧 Pump up your productivity with unstoppable flow!

COMPACT YET MIGHTY - Space-saving design with a max lift of 25 feet—perfect for professional-grade irrigation.
ROBUST 1 5 HP MOTOR - Power through irrigation tasks with reliable, continuous operation.
FDA COMPLIANT IMPELLER - Safe for water treatment applications, ensuring clean and efficient pumping.
EFFORTLESS SELF PRIMING - Never worry about manual priming again—instant water flow every time.
PREMIUM CORROSION RESISTANCE - Cast iron housing built to withstand harsh environments and last longer.

The Goulds GT15 Irri-Gator is a 1.5 HP single-phase centrifugal pump delivering 64 gallons per minute with a corrosion-resistant cast iron housing. Featuring a self-priming design and FDA-compliant impeller, it’s engineered for continuous, reliable irrigation and water treatment applications with a max lift of 25 feet.

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	16.78 kg
Manufacturer	GOULDS PUMPS
Material	Cast Iron
Maximum Lifting Height	25 Feet
Model Number	2BF40512
Number of Items	1
Part Number	GT15
Power source	Corded Electric
Product Style	Protection
UPC	697666117120 094700753489
Usage	Irrigation, Water Treatment, Continuous Operation
Voltage	230 Volts

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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

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13669.54 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Tunisia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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