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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💧 Power your flow with precision and durability!

BUILT TO LAST - Durable cast iron housing resists corrosion, ensuring longevity in tough environments.
SMART PROTECTION - Overload protection with automatic reset guards your pump from damage.
UNSTOPPABLE POWER - 1.5 HP motor delivers robust, continuous operation for demanding tasks.
FDA COMPLIANT IMPELLER - Engineered for safety and reliability, meeting strict FDA standards.
EFFORTLESS SELF PRIMING - Automatically primes itself, saving you time and hassle on every use.

The Goulds GT15 Centrifugal Pump features a powerful 1.5 HP motor with a self-priming design and corrosion-resistant cast iron housing. It operates on 230 volts AC, includes FDA-compliant impeller technology, and offers built-in overload protection for reliable, continuous water transfer up to 140°F and 125 psi.

Brand	Goulds
Model Number	GT15
Product Dimensions	55.88 x 22.86 x 25.4 cm; 27.22 kg
Color	blue
Name List for Name Plates	Protection
Material	Cast Iron
Power Source	AC
Voltage	230 Volts
Are Batteries Included	No
Item Weight	27.2 Kilograms

Pump Centrifugal Force 1.5 Hp

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