Can this be user to flush a tankless heater with vinigar

I bought the pump for this very reason. I'm not sure if it is rated to handle vinegar, but at the price I figured I'd try it and see. I have two tankless water heaters, and I wanted a pump that could clean out both at the same time and this pump certainly does the job. I have a hose that runs from the pump, into a splitter. From the splitter I have two hoses going to each water heater (one hose per water heater). Even pushing water through two hoses, it still has a strong flow, with each hose pushing about the same flow as the water hose faucet outside your house opened wide open (guestimate). The splitter I have allows me to adjust the flow rate by closing off some valves if it is too strong. For just one water heater, i would think this pump is too strong (as it REALLY moves water), but I'm not a plumber so I couldn't say for sure. If I were to do it again, I think I would have purchased the 1/4 HP pump, or even the 1/5HP for cleaning out water heaters with vinegar. I cleaned out my water heater this week for the first time using this pump. I let it run for 2 hrs, and I noticed that it got warm (about the temp of a warm-to-hot bath). I'm not sure if that is normal, but thought I'd let you know.

What's the PSI or max head (pumping vertical height) of this pump?

Length of hose for a sump pump is not nearly as important as lift. you can have a long horizontal run with only minor flow loss. Friction loss (the loss from hose length) at these low pressures is very small. The elevation (aka lift) is the true limiting factor. (PSI means pounds per square inch, FYI, the water pressure coming into your house from the main is about 50-80psi, someone wondered what psi meant). Based on the chart, this pump moves about 30 gallons per minute (gpm). If you lift ten feet the flow drops to about 20 gpm; at 20 feet of lift it's flowing about 10 gpm. I have used this with vinegar to flush my tankless water heater and I used it with about 50/50 mix of simple green and water in a 5 gallon bucket as a parts washer for motorcycle parts and the pump is fine. I do flush it with clean water when I am done.

Does it have an automatic shut off?

The pump does not have an automatic shut off. I added a float switch because I wanted it to pump out a sink that had a slow-running clogged drain where I had the washing machine. When the sink was mostly pumped out the float switch turned off the pump. It worked great for a couple years until I got around to dealing with snaking the drain which didn't have an easy clean-out. This is a good pump, since the sink drain got taken care of, we've been using the pump to pump koi pond water over a 5' fence to our neighbor's garden using about 150' of garden hose. The pump runs continuously for 5+ hours without issues in this process.

Will clothes washer hoses fit on this pump?

The pump itself fits a garden hose nicely. You can buy the attachment package listed next to it for the converter piece. It only came to around $8.00. It also comes with a larger hose. I didn't need it for my spa but if you need to empty a washer or bigger pool it seems like it would come in handy. Hope that helps. Good luck. :-)

Brand	Superior Pump
Color	Black
Material	Thermoplastic
Style	Thermoplastic
Product Dimensions	6"L x 7"W x 9.5"H
Power Source	AC
Item Weight	5.79 Pounds
Maximum Flow Rate	37 Gallons Per Minute
Maximum Lifting Height	8 Feet
Voltage	120 Volts
Manufacturer	Superior Pump
UPC	725113910144
Part Number	91014
Item Weight	5.79 pounds
Item model number	91014
Size	1/4 HP-High Flow
Pattern	Utility Pump
Shape	Round
Installation Method	Portable
Item Package Quantity	1
Included Components	1/4 HP Thermoplastic Oil-Free Utility Pump
Batteries Required?	No
Warranty Description	1 Year

Superior Pump 91014 1/4 HP High Flow Thermoplastic Utility Pump, Black

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