Can i use to drain a portable tub?

this pump has to be set outside of the water so you could attach a hose to it and prime it to empty your tub but it wouldn't work the best . I would use a sump pump

What is the purpose of the exhaust screw?

it is to bleed the air off if necessary

Where do I find Installation instructions?

Mine came with a 12 page instruction. It is pretty vague because you could use this pump several different ways. I have not installed mine yet, but plan to use it as a hot water recycling system. You tube has some videos and info or you could request a set of instructions from the Company.

has anyone used the "automatic" mode, is it working good in "automatic"?

This pump has no automatic mode. Plug it in & it runs, I connected mine to a lil timer from Walmart and a thermostat to cycle on at 85* and off at 90* (Strapped probe to hot water pipe as it comes into cabinet). One review said pump crazy hot if run for an hour! Mine runs on low, 3 min an hour, but off by timer 9 hours overnight.

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Happybuy Hot Water Recirculating Pump, 93W 110V Water Circulator Circulating Pump NPT 3/4" w/Brass Fittings, 3-speed Control Recirculation 9.5 Gpm RS15-6 for Electric Water Heater System

Happybuy Hot Water Recirculating Pump, 93W 110V Water Circulator Circulating Pump NPT 3/4" w/Brass Fittings, 3-speed Control Recirculation 9.5 Gpm RS15-6 for Electric Water Heater System

Product ID: 89870895

Details

Brand
Happybuy
Color
3-speed
Item Weight
0.3 Ounces
Material
Aluminum
Maximum Flow Rate
9.5 Gallons
Maximum Lifting Height
6 Meters

⚡93W power efficiency

💧9.5 GPM max flow

🔄3-speed adjustable control

Description

💧 Flow into the future with instant, silent hot water luxury!

ENERGY SMART EFFICIENCY - Low power draw means under $5/year in energy costs—eco-friendly meets budget-friendly.
WHISPER QUIET OPERATION - Runs so silently, you’ll forget it’s even there—perfect for modern homes.
WINTER PROOF PIPE SAFE - Prevents freezing and warms floors—ideal for cold climates and smart home comfort.
DIY FRIENDLY INSTALLATION - Tool-only setup with brass fittings saves plumber fees and hassle.
INSTANT HOT WATER ZERO WAIT - Cuts wait time from minutes to seconds—luxury your mornings deserve.

The Happybuy Hot Water Recirculating Pump RS15-6 delivers up to 9.5 GPM flow with a 3-speed control and 93W power consumption. Featuring durable aluminum housing, corrosion-resistant impeller, and brass fittings, it ensures quick hot water delivery in as little as 15 seconds. Designed for easy DIY installation and whisper-quiet operation, it prevents pipe freezing and reduces water waste, making it an energy-efficient upgrade for modern homes and cold climates.

Specifications

ASIN	B07GRPLGJ8
Best Sellers Rank	#639,685 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #854 in Power Water Pumps
Brand Name	Happybuy
Color	3-speed
Customer Reviews	4.2 4.2 out of 5 stars (590)
Flow Rate	9.5 Gallons Per Minute
Included Components	Power Water Pump
Item Dimensions L x W x H	4.9"L x 4.8"W x 4.4"H
Item Type Name	Hot Water Recirculating Pump
Item Weight	0.3 Ounces
Manufacturer	Happybuy
Manufacturer Part Number	B07GRPLGJ8
Material Type	Aluminum
Maximum Lifting Height	6 Meters
Model Number	RS15-6
Power Source	ac
Product Style	Pump
Specific Uses For Product	Residential buildings, Commercial buildings, Water and pressurized systems, Industrial equipment, Air conditioning, Boilers, Solar circulating water, Hot water circulating warm
UPC	601707189212
Unit Count	2.0 Count
Voltage	120 Volts

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