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Basement Watchdog Big Dog Backup Sump Pump (2200 GPH @ 10') & 2 Batteries

Basement Watchdog Sump Pumps and Accessories
(Based on expert analysis, manufacturer ratings and customer reviews)
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5
5 Reviews
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  • Features
  • Specs
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  • Accessories
Back-up Sump Pumps
Switch Type
Vertical Float Switch
Extended Run Time - Up To 15 Hours of Backup Power
2 batteries, 2 battery acid packs & connector cables included
*Please Note* Only 1 battery box is included

Protect Your Basement from Flooding
Automatically starts when your existing sump pump fails
Senses power outages, malfunctions, stuck floats and more

Exclusive Monitoring System w/ Weekly Self-Test
Computer-controller monitors power conditions & battery level
Indicator light displays remaining battery strength
Sounds alarm & flashes during failure or required maintenance

Backup Sump Pump
Empties the sump pit in seconds after a malfunction or outage
Pumps 3500 gallons-per-hour @ 0’ lift (or 2200 GPH @ 10’ lift)
Runs on 120-volt AC power when power is on
Switches to 12-volt DC battery power when AC power fails

20-Amp Battery Charger
Quickly recharges battery when power is restored
Shuts off completely to prolong the life of the battery

Dual Float Switch (BWC1)
Turns on the pump to make sure its working

12 Volt DC/120 Volt AC
Battery Included
Housing Material
Float Type
Vertical Float
GPH @ 0 feet
GPH @ 10 feet
150 Pounds
Consumer Warranty
2 Years
Download Documents
Need Help? Ask Our Experts.
  5 Questions
Q: I am interested in the 2 battery system back up sump pump. Can I install this myself.+ I am fairly profecient .
by JIm Dreyer from New Jersey on June 23, 2012

A: If you are somewhat familiar with plumbing and working with PVC, primer and cement, you shouldn't have much of a problem. The pdf of the owners manual is available for download on the PRODUCT PAGE to give you a look at the installation process. It can be found on the right side of the page under the "Specs" tab.
by Jim, Product Expert

Q: Is the PeakFlow 12v maintenance free deep cycle 120ah AGM battery compatible with the WatchDog BW4000 pump system and charger ? Will it last 7.5hrs in continuous mode like the battery sold with the kit? What is the shelf life if used 2x a year intermittently for 1hr. for
by Walter from Michigan on March 12, 2012

A: Per the instructions for the Basement Watchdog battery backup systems, DO NOT use a maintenance-free or a sealed battery. They are made of different materials and
will trigger a false “Battery problem” alarm.
A new Basement Watchdog 7.5 Hour Standby Battery, model 30HDC140S will run this system for a minimum of 7.5 hours continuously. However, most of the time the pump will turn on and off, and the battery will run the pump intermittently for days. In addition, the unique materials in the battery enable it to last for five to seven years in standby service.
by Jim, Product Expert

Q: My sump well is about 14" wide. How complicated should I expect the installation to be?
by Karen from Connecticut on August 25, 2011

A: In most cases the backup pump will fit next to the main AC pump in the sump pit. In very narrow pits, the backup pump can be mounted above the main pump. Try to fit the backup pump on the floor of the sump first. The installation instructions are available on the PRODUCT PAGE under the "SPECS" tab for download.
by Jim, Product Expert

Q: Do I need to leave my battery backup system charging at all times?
by Patrick Mcclone from Wisconsin on January 03, 2011

A: To be completely sure your backup system is fully functional during a power outage or weather event, these systems need to stay plugged in at all times.

by Jim, Product Expert

Q: If I buy a Basement Watchdog pump do I need a Basement Watchdog battery?
by Karen from Illinois on January 03, 2011

A: You can use any deep cycle marine battery, as long as it is not maintenance-free. However, there are several advantages to using a Basement Watchdog battery. The Watchdog battery accommodates the system’s fluid sensor which will sound an alarm when the battery needs water…a very important feature, since a dry battery will not perform. In addition, Basement Watchdog batteries run longer per charge, and last years longer. A typical marine battery will last 2-4 years, while the Watchdog battery will last approximately 5-7 years. Basement Watchdog batteries are shipped dry (without acid) so they stay fresh on the shelf indefinitely, while wet batteries have a short shelf life.

Update 11/16/15: Basement Watchdog has changed this requirement around 2013 and their backup systems will now accept maintenance free batteries. Please refer to their updated installation manual for instructions on the proper method for this battery installation.

by Jim, Product Expert

Basement Watchdog SPD-DBDKIT Reviews & Ratings
Overall Rating
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5
Features (2)
Easy To Install (2)
Quiet (1)
Reliable (1)
Easy To Use (1)
No 2nd Battery Acid Leve... (1)
Adding Battery Fluid Is ... (1)
No Level Probe For 2nd B... (1)
100% of respondents would recommend this product to a friend
5 Reviews  Sort by 
Bart W.
Boulder, CO
Purchased from Sump Pumps Direct
Purchased 9/23/13
5 out of 55 out of 55 out of 55 out of 55 out of 5
A Good Value At A Reasonable Price Point
This review is predicated upon future performance after all this is a backup system that kicks in when AC power fails.

Pros: well packaged full kit with everything needed (except plumbing parts to replumb the pit) manufacturer will spend umpteen hours on the phone as you learn and research nice array of alert alarms dual-battery option provides potential for days' worth of backup compact footprint in the pit yet decent gallons per hour rating (assuming you plumb wisely).

Cons: it'd be... more
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Pros: Features, Price, Dual Battery Option
Cons: No Level Probe For 2nd Battery, Adding Battery Fluid Is Dicey
Bart Recommends This Basement Watchdog Product
Manufacturer Response
Brand Rep
Thank you so much for your awesome and detailed review. We really appreciate hearing facts like these from our customers.
Bart Would Recommend Sump Pumps Direct To A Friend
Web Site


"This website is incomparably far and away better than any other sump pump shopping site I visited, especially and including all Glentronics' authorized resellers'. Given the nature and importance of this sort of purchase I'd want more info than this site provides but it's easy to obtain it by calling here or the manufacturer."
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Jon Hoch, Founder
Bolingbrook, IL
Total Reviews
73 Reviews
Total Helpful Votes
259 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Double Power System
We know what you're thinking: "This kit isn't cheap!"

Let's put things into perspective. It takes just one thunderstorm to destroy your basement and weekends worth of sweat equity.

If you have a finished basement, you need a backup sump pump system. Otherwise, your entire basement is at risk of flooding.

You're not only buying protection with this kit. You're getting peace of mind, too.

No more worrying about power outages, malfunctions or clogged pumps. This Basement... more
Manufacturer Response
Brand Rep
Thank you for your review. We appreciate your trust in our company and products.
Was this review helpful?
Philadelphia, PA
Purchased from Sump Pumps Direct
Purchased 9/29/11
5 out of 55 out of 55 out of 55 out of 55 out of 5
Great System. No Issues Since 2011 Install
I'de heard horror stories about flooded basements in other peoples' homes, but when I looked at battery backup systems they were always so expensive I just dismissed them. Well, in 2011 my unfinished basement flooded during hurricane Irene. Adding insult to injury, we were out of the country on vacation at the time. Luckily, my family helped me out and took care of things until we could get back home so I avoided mold. But needless to say, everything porous was ruined!

Right then and... more
Pros: Features, Easy To Use, Quiet, Reliable
Cons: No 2nd Battery Acid Level Probe
Jeff Recommends This Basement Watchdog Product
Manufacturer Response
Brand Rep
Thank you so much for your review! We really appreciate your feedback. We know that you will be happy for years to come.
Was this review helpful?
George L.
Skillman, NJ
Purchased from Sump Pumps Direct
Purchased 2/10/14
5 out of 55 out of 55 out of 55 out of 55 out of 5
Good System
I'm not super-handy, but easy enough to install.....
Pros: Easy To Install, Easy To Install
George Recommends This Basement Watchdog Product
Manufacturer Response
Brand Rep
Thank you for your review of this BigDog Kit. We want you to know that we always consider our customers in making our products with great quality and high tech, yet easy to install.
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Derek K.
Kenosha, WI
Purchased from Sump Pumps Direct
Purchased 10/12/09
4 out of 54 out of 54 out of 54 out of 54 out of 5
Seems Pretty Good
Thankfully, it works out of the box.
Manufacturer Response
Brand Rep
Thank you for your review.
Was this review helpful?

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