Basepump RB750-AVB with Back-flow Prevention Vacuum Breaker

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Price: $335.00 

Product Feature
- Water powered backup sump pump
- Fully hydraulic operation
- No batteries or chargers
- Operates when the main sump pump fails
- Atmospheric Vacuum Breaker prevents back-flow
Product Description
This model of our already popular Basepump RB750 contains an Atmospheric Vacuum Breaker that prevents contamination of the potable water supply. If installed correctly, this unit meets the code requirements in more jurisdictions than our standard model Basepump. Does it meet the codes in your area? You have to find out from your local plumbing department. Make sure you can fill a 5 gallon bucket at your outside hose spigot , without the hose, in less than 40 seconds for this pump so you know you have enough water flow to feed it properly.
Basepump RB750-AVB with Back-flow Prevention Vacuum Breaker Review
This is a water powered back-up sump pump. It eliminates some risks that a battery powered pump has, plus you don't need to replace batteries every several years. It runs off of your city water supply, and draws one gallon of water from your supply for every two it pulls out of your sump, then dumps all three outside of your house.
1. Water Powered Versus Battery Powered: Everything, including the sump float, is water powered, so as long as you have water pressure, this unit will work. In contrast, a battery backup will fail if you forget to test/replace your battery every several years, or if the power is out during a long enough storm to use up your battery (from what I read, 18-24 hours of hard rain will do it). So the bottom line is that it's pretty unlikely that a battery backup will fail, but this unit eliminates those risks. (And exposes you to a new risk - that if you lose your main sump pump AND water pressure, you're out of luck).
2. Installation: You mount the pictured unit on your ceiling joists over your sump well, and connect the back end to your water supply (before the pressure regulator), the front end to a discharge pipe, and the bottom pipe to your sump. You set the float switch for this unit higher than the float for your main unit, so if the main unit fails for some reason, this one will take over. The unit does not have a built-in alarm, so you may also want a battery alarm to tell you that you're on backup -- if so, put the battery sensor between the levels of the two floats, so that the alarm goes off before the backup unit triggers. (Basepump shipped a free battery alarm with mine; I'm not sure if one is included any more). Installation requires some additional parts - enough 1" PVC to run to your sump, and enough plumbing parts to connect the unit to your water supply. I used flex "PEX" pipe and push-on fittings to connect to my water supply, and it took me and a buddy about 5 hours and $100 in extra parts to get it hooked up, including the discharge line outside of the house. (We are plumbing novices, so we took it slow).
Note: Some of the reviews for the other models complain about water hammer - a loud bang when the pump shuts off. I haven't had that problem. I don't know whether it's because I used PEX pipe instead of copper or whether I just got lucky, but I'm glad I didn't waste time installing a hammer arrestor before I saw whether I had a hammer problem.
3. Comparision of Basepump Models: You've probably noticed several models on the side. The "RB750" refers to the amount of water this thing can pump per hour. The final number will depend on the water pressure and the distance of lift required, but Basepump estimates 750-900 gallons per hour for this unit, and 1000-1400 for the RB1000. The 750 seems plenty fast for me.
Note that Basepump recommends that you test your water pressure by seeing how long it takes you to fill a 5 gallon bucket from an outdoor spigot. See their website for more, but make sure you have enough pressure before you pick a unit!
The "AVB" means that this model comes with an atmospheric vacuum breaker, which eliminates the chance of backflow. (Basepump seems pretty confident that you won't get backflow no matter what, but some plumbing codes require AVBs). Basepump's "AVB" units require their own discharge line, so we needed to put a new line running outside of the house for the water to go out of. Basepump recommends that you put a new discharge line in for the non-AVB models in case your main line becomes blocked or frozen, but you can connect to the main line if you have a non-AVB model and don't want to cut a (small) hole in the side of your house.
4. Summary: I'm very happy with this unit. It was price competitive with battery backups, and this way if a rainstorm hits while I'm out of town, I don't need to worry about my battery failing. It was a mild pain to install, but I'm glad it's there.
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