Model # BW4000

Internet #202042663

Store SKU #618637

Store SO SKU #1000897548

Basement Watchdog 1/2 HP Big Combination Unit with Special Backup Sump Pump System

Basement Watchdog

1/2 HP Big Combination Unit with Special Backup Sump Pump System

$397.00 /each

Frequently Bought Together

Product Overview

The newly upgraded Basement Watchdog Special is now added the +, with new features that make it an even better solution for preventing basement flooding. This Big Combo+ is a pre-assembled energy efficient 1/2 HP Cast Iron Cast Aluminum primary pump combined with the newly upgraded Basement Watchdog Special+ Battery Backup Sump Pump System. With two pumps in your sump, you will know your basement is protected. Easy to install with little or no plumbing knowledge required. New features include: Weekly self-test of the pump, compatibility with maintenance-free AGM batteries, improved charging and monitoring and a remote terminal for easy connection to a security system, auto dialer or other similar device.

  • 1/2 HP energy efficient permanent split capacitor (PSC) primary pump can save money on your electric bills
  • Primary pump capacity 3,200 GPH at a 10 ft. lift and 4,400 GPH at 0 ft. lift
  • Backup system capacity 1,730 GPH at 10 ft. lift and 2,500 GPH at 0 ft. lift
  • Includes a battery backup system with unique monitoring that sounds an alarm, illuminates a warning light and describes what to do for easy maintenance
  • Runs weekly pump cycles to check for proper pump operation and to exercise the pump
  • Peace of mind when away from home, remote terminal allows the ability to communicate with an auto dialer, home security system or other device, to alert you to problems or required maintenance
  • Dual float switches on both the primary and backup systems provide 4X the protection
  • Provides days of intermittent pumping power on a single battery charge
  • Fluid sensor monitors fluid level of the battery
  • Compatible with both wet cell and maintenance-free AGM batteries
  • Connect 2 batteries in parallel for double the run time
  • Automatic 1.6 Amp battery charger
  • Compact design fits in pits with diameters as small as 12 in.
  • Detailed instructions with over 90 pictures walk you through the simple installation process
  • Free lifetime technical support
  • Includes controller, 1.6 Amp charger, 2 dual float switches, primary pump, backup pump, remote terminal and instruction manual (battery not included - sold separately)
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Info & Guides

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Warranty / Certifications

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Customer Questions & Answers

Can this pump be used outside?

I noticed the controller can not get wet. How can this be used when the sump pump pit is outside?
Asked by: Adam
Yes, the sump pump can be used outside.
Answered by: CommunityAnswer
Date published: 2016-03-22

If the primary pump fails but the home still has power, will the backup pump use the home power or battery?

Thinking of a case where I might be on vacation and the primary pump fails. If the backup only works on battery then it could be long dead before I return home.
Asked by: Andrew
For this system in particular the backup pump specifically operates on battery power. Your home power is helpful in charging the battery but cannot run the backup pump itself. Please note that if the primary stops working due to power failure the backup will kick in and operate to its fullest potential. Once the AC power is present the primary should automatically kick back into action. We recommend that you call us directly if you may have any additional questions at 800.991.0466. Ext 3 for technical support. We are available Mon-Fri 9-5 CST.
Answered by: Glentronics
Date published: 2016-07-07

Battery backup sump pump

If I purchase a combination backup sump pump, can installation be arranged through Home Depot?
Asked by: Janice
Maybe. Check at your local store to make sure. It's a fairly easy replacement.
Answered by: ced4511
Date published: 2015-09-20

Does the back up pump sit higher than the pimary pump?

Asked by: tzack
Yes, the backup pump and float sit higher than the main pump.
Answered by: Duped
Date published: 2016-09-21

Do I have to use the Watch Dog battery? I have a different backup pump installed now.

Asked by: Mark
You don't have to use the watch dog battery, but of course that's what the manufacturer recommends. As long as it is the correct voltage it will work. I assume that since you have a battery already it would work. One of the caps on the watch dog battery cells has a hole for a probe to detect low acid level, but you do not need to use that feature. The installation procedures tell you how to connect the probe so that you don't get false alarms from it when it is not used. The electrical power connections may require some new ring terminals for the battery terminals if they are different than the watch dog battery, but that should be and easy change. The installation of the primary pump and backup pump unit is fairly simple since they are already assembled into one piece. The assembly has only one discharge port, and is equipped with 2 check valves, so just one water connection is required.
Answered by: ced4511
Date published: 2015-12-29

Is a weep hole needed?

Asked by: Lefty
Yes it is. This prevents airlock. Please contact us directly if u have any other questions at 800.991.0466 ext 3 for tech support
Answered by: Glentronics
Date published: 2016-05-05

Does Home Depot sell and AGM battery for this?

If not, what are the requirements for a compatible AGM battery?
Asked by: GH58
Our brand does not offer an AGM battery in store but we will definitely take this suggestion into consideration. Please contact us directly on instructions for AGM hook up with this system at 800.991.0466 ext 3. We would love to assist you.
Answered by: Glentronics
Date published: 2015-11-20

Can both pumps be running at the same time when the primary pump cannot keep up by itself?

Asked by: Tom
Yes. if the water reaches the level of either float the pump it is specifically attached to will turn on even if the water activates both at the same time. This is a big help during times of heavy rain fall or snow melt. Please call us directly at 800.991.0466 ext 3 for tech support if you are in need of further assistance M-F 9-5 CST
Answered by: Glentronics
Date published: 2016-01-04
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Customer Reviews

1/2 HP Big Combination Unit with Special Backup Sump Pump System is rated 4.2 out of 5 by 73.
Rated 5 out of 5 by from This sump pump is a great Product. It comes with battery monitoring, alarms, and a test button f... This sump pump is a great Product. It comes with battery monitoring, alarms, and a test button for peace of mind. I would recommend this product for anyone upgrading their sump pump. Very good detailed instructions on safety and how to install. The wires can be a mess, but it just takes some time to zip tie them properly. Removal of the old pump took about 30 minutes, Cleaning the sump out took 15 minutes, filling the battery took 30 minutes, and install of the pump took 30 minutes for me (Not a plumber but pretty handy). A little over 2 hours and Whoala! Installed. Quality materials and is truly "out of the Box" ready (minus the battery and acid). The unit was much quieter than my old sump pump too.
Date published: 2016-11-16
Rated 1 out of 5 by from Poor Main Pump Motor - Burned out after 1yr I bought this pump after an older one failed. I was able to install it easily and used a lawn mower battery for the backup. After about 2 months of it working great, the backup pump notification was going off constantly. The main pump had stopped running. I disassembled the plastic on the main pump motor and found some sand stuck in the main motor. I had to replace the float switch and it worked fine for another 2 months or so when the backup pump was running constantly again. Took it apart like last time and it worked again. Now, approximately 1 yr after I installed it, the main motor is done. The backup pump was still working fine, but one of the PVC elbows had a pinhole leak somehow. All in all, I would not buy this. I recommend calling a local plumber to get reccomendations, or a more reputable brand. After 1 yr, there is no warranty coverage, so I am out of luck and $400 for this piece...
Date published: 2016-10-16
Rated 2 out of 5 by from My system is now 2 years old and I have to say I wish I had bought something else. The first one ... My system is now 2 years old and I have to say I wish I had bought something else. The first one I bought I've had to replace within a week since the paint was peeling off the pump. Did the work myself so the only extra expense was... my time. Down the road I've discovered that the controller for the backup pump does a really poor job at keeping the battery charged. I get the battery alarm come on quite often and every few months I must add distilled water and place the battery on a proper charger. But, you can only do that so many times until the battery becomes useless, so now I must add another deep cycle battery to the cost of this sump pump system. I hope they come out with a new solution for the battery charger/controller, which I assume is a trickle charger.
Date published: 2017-02-07
Rated 5 out of 5 by from I just installed this, so I can't yet vouch for long-term reliability. However, this combination ... I just installed this, so I can't yet vouch for long-term reliability. However, this combination unit seems well engineered and comes with detailed, easy to follow instructions. Previously, I had a standard AC pump and attached a battery backup unit to it. It was cumbersome and difficult to establish the proper mounting height for the backup pump, get both float switches to work without hitting the sides of the pit, and merge the discharges from the two pumps. With the Basement Watchdog, the relative height of both pumps, the pump switches are designed to work together and the discharges are connected. I just dropped the assembled unit it into the sump pit and connected the discharge pipe. Easy! I like, too, that there are redundant float switches should one fail (been there). The backup battery is heavy duty, much more so than the previous installation. The price is more than my previous setup, but worth it for ease of installation and the peace of mind.
Date published: 2017-01-10
Rated 5 out of 5 by from Great sump pump! Our old sump pump (20+ years) failed when we got a lot of rain from the remnants of Hurricane Isaac, partially flooding our basement. I did a lot of research trying to find a quality combination primary and battery backup sump pump at a decent price, and I definitely found it! Home Depot had a very competitive price and got it to me very quickly. This was my first sump pump install, so it took me some time, but it was very easy. The only drawback was that I had to buy the battery and acid separately and pour the acid into the battery myself - a little nerve-wracking, but no problems. I thoroughly tested the system, and both the primary and battery backup pumps work perfectly.
Date published: 2012-12-03
Rated 1 out of 5 by from Not a good decision - look elsewhere. The product was easy to install. However, after only a year or use, I am on the third float for the main pump and now the main pump has failed. Very disappointed in this system.
Date published: 2016-09-21
Rated 4 out of 5 by from This product was easy to install. Took me about 10 minutes to cut my sump line, install the new s... This product was easy to install. Took me about 10 minutes to cut my sump line, install the new sump and back-up and connect the rubber union. Took me a longer to deal with the battery (about an hour, but this was because I was very nervous having to add the acid to the battery. Really took my time to make sure I didn't spill or get any acid on me.). Getting the backup battery set up wasn't too bad. The worst part is getting all the wires untangled and sorted neatly so it doesn't look like you dumped a plate of spaghetti on the floor. After installation I tested the back-up by unplugging the main pump and adding water to the sump to trigger the back-up float. An alarm went off letting me know the main pump lost power and the back-up kicked right in and emptied the sump. Plugged the main pump back in, reset the alarm and done. I've had it installed for about two weeks now and it is much quieter than my old 1/2 horsepower sump. So far so good. I'm giving it four stars instead of five simply because of the cost of the total package. Maybe I'm being cheap, but Sump+Battery+Acid = $584 seems a bit much. But it is probably cheaper than redoing the entire basement. PROS: Ease of installation, clear instructions CONS: Keeping wires neat, have to buy back-up battery and acid separate
Date published: 2016-11-08
Rated 5 out of 5 by from Close your eyes and get this Best of the line combo (bw4000). Professionally packaged, easy to install, very well thought out and hooks up easily to battery. Best thing is that I called the company (glentronics) after a while (I didn't install fully until a storm was brewing) about a bad power supply. They had no problem sending me a replacement free of charge. Good customer service and parts availability on top of a good product makes me highly recommend this. Only thing I would recommend to them is to have a float switch housing that would not allow dirt/particles to prevent the float from working. But this is still the best floats available on the market.
Date published: 2012-10-30
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