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 Centrifugal Force 1.5 Hp

Product ID: 765020038

Details

Brand
Goulds
Color
blue
Material
Cast Iron
Style
Protection
Product Dimensions
55.9L x 22.9W
Power Source
AC

⚡1.5 HP Power Boost

💧64 GPM High Flow Rate

🛡️Corrosion-Resistant Cast Iron

€ 3131.05

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Description

💧 Power your flow, own the moment.

ROBUST 1 5 HP MOTOR - Power through demanding tasks with reliable, continuous operation.
EFFORTLESS SELF PRIMING - Never worry about manual priming again—instant startup every time.
OPTIMIZED FLOW AT 64 GPM - Maximize efficiency with high-volume water transfer.
BUILT TO LAST WITH CAST IRON - Corrosion-resistant housing ensures longevity in any environment.
PREMIUM FDA COMPLIANT IMPELLER - Engineered for durability and safe water handling.

The Goulds 1.5 HP centrifugal pump delivers a powerful 64 gallons per minute flow rate with a corrosion-resistant cast iron housing and FDA-compliant impeller. Featuring a self-priming design and built-in overload protection, it ensures reliable, continuous operation for both residential and commercial water transfer needs.

Specifications

Asin	B00S2C34E2
Brand Name	Goulds
Color	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 cm
Item Weight	37 Pounds
Manufacturer	Goulds Water Technology
Manufacturer Part Number	GT15
Material Type	Cast Iron
Model Number	2BF40512
Power Source	AC
Product Style	Protection
Specific Uses For Product	水の移動、自宅・商業設備、ポンプの使用
Upc	697666117120 094700753489
Voltage	230 Volts

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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€ 3131.05

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered 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 Austria.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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