Hi & Dry Water-Powered Backup Sump Pumps

Unbeatable Reliability and Performance

No Electricity or Batteries Needed – Reliability of the primary sump pump is very important but it is absolutely critical for the backup sump pump, which is your "last line of defense" against basement flooding. During heavy rainstorms, or significant snow melts, you do not have to worry about a power outage or sump pump failure, or about the battery on a battery-powered back-up sump pump.

What makes our pumps particularly unique is their location outside the sump pit. While other back-up sump pumps have to be placed inside the pit, our Hi & Dry™ pumps are mounted "high and dry" on the ceiling. When called upon, the Hi & Dry™ Water-Powered Backup Pumps can run infinitely, as long as municipal water is available (not limited by a battery charge).

Comparison of Water-Powered Backup Sump Pumps

The pumps require no cleaning or maintenance. There is no impeller or motor – no rotating parts to break or wear off. They are constructed of heavy duty, corrosion-resistant materials (Schedule 80 polypropylene) for practically unlimited longevity.

Water Powered Backup Sump Pump by RadonSeal

30-DAY MONEY-BACK SATISFACTION GUARANTEE – Within 30 days of shipment, if not completely satisfied with the pump, it can be returned for a full refund of the price less shipping charges. You must phone us first and provide your name, address, and phone number. If you decide to return the pump please purchase a shipping insurance in case it gets damaged during the return shipment to have a claim against the shipper.

FIVE-YEAR WARRANTY – We warrant the pumps against defects in material and workmanship for a period of five years from the date of shipment. At our option, we will replace or recondition the product at no charge to the customer. Shipping the product back to the manufacturer is at your cost

Order Today

Hi & Dry™ Water-Powered Backup Sump Pumps are not sold in stores but delivered directly from the factory to your door. Orders received by 2 PM ET are normally shipped the same day and delivered by courier (via UPS) within 2 to 5 workdays within the lower 48 states. Based on shipping by courier to the lower 48 states. For expedited shipping or shipping to other states and Canada (via USPS), please inquire first by e-mail or telephone.

Hi & Dry™ Water-Powered Backup Sump Pumps
Item Price Shipping  
Hi & Dry pump RB-750 (with complete accessories) $299 $11 Order Now button
Hi & Dry pump HB-1000 (with complete accessories) $359 $15 Order Now button
Hi & Dry pump CB-1500 (with complete accessories) $395 $20 Order Now button
Push-On Plumbing Kit 3/4" (with the Kit) $79 -- Order Now button
Push-On Elbow 3/4" (with the Kit) $11 -- Order Now button
Double Check Valve 3/4" (or 1/2" or 1") $29 -- Order Now button
Integral Atmospheric Vacuum Breaker (AVB) $36 -- Order Now button

How Water-Powered Backup Pumps Operate

water-powered backup sump pump photo

A Well-Proven Principle – This is a truly simple and elegant design because there are no batteries and no moving parts! Pressurized municipal water pushes through the pump (Venturi nozzle) and as it speeds up, its pressure drops. This creates suction. The sump pump ("ejector") draws water from the sump pit by suction just like through a giant soda straw.

This is a well-proven and reliable principle - that’s how they make vacuum in school labs!

Basic Backup Sump Pump Set-Up

installed water-powered backup sump pump illustration

The operation is fully automatic – it works whether you are home or away. The backup pump has its own float switch, which activates the pump when water level in the sump pit rises too high – above the level normally allowed by the primary sump pump. This simultaneouslyactivates an audible high water alarm to let you know that there is something wrong with the primary pump or the power supply.

Installation Instructions

SUCTION PIPE – The suction pipe (PVC pipe not included) reaches down to above the bottom of the sump pit and is connected to a check valve (included) below the pump.

DISCHARGE HOSE – A flexible discharge hose takes the water outside to a relief tee for a separate discharge, which is the recommended setup. Alternatively, the discharge hose can be connected to the existing discharge pipe using a T-connector (included).

ADJUSTABLE HYDRAULIC FLOAT – The hydraulic (not mechanical) tethered float switch is not dependent on electricity or a battery. Its activation elevation is fully adjustable. It is connected to the pump by flexible pressurized tubing, which is clipped on to the suction pipe. To help with the limited space inside sump pits, the minimum needed lift of the grapefruit-sized float is only about 1.5–2 inches. Its only function is to start the pump. It does not need to fully drop down to a vertical position. There is an adjustable timer screw on the pump, which extends how long the pump works in each pumping cycle as needed to empty the entire pit (typically set at 20-30 seconds).

Recommended Backup Pump Setup

A separate discharge pipe not connected to the primary pump discharge, emptying onto the backyard or into municipal drain. This allows the backup pump to work in case the primary discharge gets clogged or freezes up. If the sump pump discharge leads to the municipal sewer, leave an air gap of at least 1" to protect against backup.

Built-in Backflow Prevention – The main ejector valve has a solid rubber diaphragm, which reliably isolates sump water from the municipal water, and a patented integral check valve that closes the main valve drip-tight by using the pressure of municipal water – the water cannot flow backwards. More obviously, when mounted on the ceiling with suction and discharge pipes empty, any backflow suction would just suck in air through the discharge pipe. (The suction pipe and discharge pipe are connected through the Venturi nozzle and are filled with air.)

Choosing the Right Pump Size

City Water Pressure – The volume of water drawn by the ejector depends on the city water pressure. The higher the water pressure, the higher the pumping rate. The higher the needed "lift" from the bottom of the sump pit, the lower the pumping rate. But up to a 15-ft. lift, it does not decrease dramatically. Pumping Rates in GPH for all models based on a 10-ft lift:

Pump Model RB-750 HB-1000 CB-1500
Water Pressure (psi)   Sump Water Removed (GPH)
Sump Water Removed (GPH)
Sump Water Removed (GPH)
40 750 1,000 1,500
50 800 1,100 1,600
75 850 1,300 1,800
100 900 1,400 2,000
Water Connection 1/2"(adaptor incl.) or 3/4" 3/4" 3/4"(adaptor incl.) or 1"
Suction Pipe,
Discharge Hose
1" 1-1/4" 1-1/2"
Typical Use Residential, homes with normal amount of sump water Residential/Comercial, homes with high volumes of sump water Commercial, buildings with very high volumes of sump water

Determining Sufficient Water Flow

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CITY WATER PRESSURE – Required 40 to 100 psi at the pump – a normal range for residential service. You can check with your local water supplier or Building Department, or test it with a standard static pressure gauge.

TYPE OF PIPING – Install using copper or plastic piping approved in your area. Do not connect to or install using galvanized iron pipe (reduced flow due to calcium buildup and a risk of rust or debris breaking loose). Connecting pipe sizes:

  • RB-750 – ½" or ¾"
  • HB-1000 –¾"
  • CB-1500 – ¾" or 1"

PRIVATE WELL – Insufficient water flow will reduce the pumping rate of the pump or it may not operate at all. Minimize the length of piping and the number of elbows to the pump. If you are on a private well, the water pressure is not sufficient and you have to use a battery-powered back-up pump instead.

FLOW RESTRICTIONS – The pump must be “teed in” before any devices that reduce flow, such as a water softener, filter, or pressure regulator valves (PRV). They do not reduce static pressure but restrict water flow. However, if the pressure is too high, connect after a PRV.

HOUSEHOLD WATER FLOW – Pressure alone is not enough - what counts is how much water flow it delivers! Use the "bucket test" below.

Use the "Bucket Test" to Determing Water Flow

Remove the garden hose from an outside spigot and place a 5-gallon bucket under the spout. Open fully the spigot and measure with a watch how long it takes to fill the bucket to its full mark (usually a couple inches from the top). This test is not valid if the line to the hose spigot connects after a water filter or water softener. You must be able to fill the bucket within the following maximum time for each pump model:

  • RB-750 – 40 seconds (equivalent to 7-gallons/minute)
  • HB-1000 – 30 seconds (10 gpm)
  • CB-1500 – 20 seconds (15 gpm)

The water connection to the hose spigot is usually only 1/2" and the spigot itself further restricts the flow. But these restrictions are similar to those inside the pump. (Do not test at the laundry tub, which often has smaller supply tubes and a more restrictive faucet.)

A Complete Kit for Contractor and Do-it-Yourself Installation

Installation with Kit Contents, Tools Needed, Checklist, and Mounting options. The illustrated pump and accessories kit is for the classic set-up with separate suction and discharge pipes.

sump pump parts included
click to enlarge!
  • Pump (ejector)
  • One-Way Check Valve
  • Mounting Clamps and Screws
  • PVC Fittings
  • 6-ft. Flexible PVC Discharge Hose
  • Plastic Cable Tie Straps
  • Discharge Relief Tee
  • Hydraulic Float and Transfer Tube
  • Suction Screen
  • Independent High Water Alarm (needs a 9 V battery)
  • Fully Illustrated Instruction for DIY Installation

The flexible discharge hose takes the water to a separate discharge through the basement wall, which is the recommended setup. Alternatively, it can be connected to the main discharge pipe using a T-connector (included). In case the backup discharge pipe freezes up, the included pop-up pressure relief valve will spill the water onto the backyard, allowing the backup pump to operate. If the discharge hose is connected to the main discharge pipe, install the pop-up valve on the main pipe and make sure that your check valve above the primary pump is in good working order.

THe Hi & Dry Design Features

These are the most reliable pumps on the market – backed up with a 5-Year Manufacturer's Warranty, the longest in the industry. Note that some plumbers promote their own pump unaware of their performance or reliability. Insist on a good design!

  • KEEPS CLEAN, LASTS LONGER – The pump and float are not exposed to the grime and debris inside the pit or to corrosive salts from a water softener. No deposits buildup and no corrosion. Maximum reliability and longevity.
  • HIGHER PUMPING PERFORMANCE – Do not have to push all the sump and city water up from the pit like other pumps. Being mounted on the ceiling, our pumps let the city water flow through and pull up just the sump water. This results in a much higher pumping performance – the combination of pumping rates and lift. They generate such a high vacuum (over 27" Hg) that they easily pull water over 15 ft above the sump pit bottom. At the same lift, their pumping rate is much higher.
  • BACKFLOW PREVENTER – Other designs are susceptible to backflow due to the column of water standing in discharge pipe. Without backflow preventers, the sump water may find its way back into your drinking water.
  • TWICE AS EFFICIENT – At 60 psi municipal water pressure, our pumps consume 1 gallon of city water to remove 2 gallons of sump water, and even less at a higher pressure. Twice as efficient as other pumps.
  • SUITABLE FOR SMALL PITS – The only solution for smaller sump pits, even as small as 10" in diameter. Other pumps with their mechanical floats need at least 18" in diameter.
  • ZERO INTERFERENCE – Our pumps do not interfere with the primary pump or its float inside the pit, which has caused many a pump failure.
  • EASY TO COVER – The sump pit can be covered and sealed around the suction pipe. Other pumps with their bulky mechanical floats do not allow the pit to be tightly covered, which lets soil gas, water vapor, and radioactive radon gas into the basement. Also a hazard to children and toys. Unacceptable!
  • DRAINS THE PIT – The suction pipe reaches to the bottom of the sump pit and the pump empties the entire pit in each cycle. The ejector runs for full 15 to 45 seconds (adjustable). Other backup sump pumps have mechanical floats with limited travel of several inches and empty the pit only partially. This means frequent pump cycling and a short service life.
  • ON/OFF SWITCH – Our float switch has a positive on/off action. Mechanical switches, particularly when exposed to dirty sump water, can get stuck in a partially open condition, which would send city water into the pit and flood the basement.
  • LOUD ALARM – High water alarm with output relays is included. This loud 85 dB alarm lets you know that there is something wrong with your power supply or the primary pump. It is required in some states but is not included with other pumps (value $30). You can connect it to your security system or even an auto-dialer. Set it up to call your cell phone.
  • DIY INSTALLATION – Our pumps come as a complete D-I-Y installation kit, making the installation quick and easy for homeowners or contractors.

Backflow Prevention is About Safe Drinking Water

Every water company receives each month several calls from homeowners complaining about "blue water" from their faucets. They and perhaps also their neighbors have been drinking their own toilet tank water which has been colored by toilet bowl cleaner! Instead of a "plumbing code approved" toilet flush valve, they had bought a cheap one.

If a nearby fire hydrant is turned on or a water main breaks, the sudden loss of water pressure may cause "back siphonage" and draw contaminated water into the potable water system. If your neighbor is using a garden hose to fill a swimming pool or to spray pesticides on his lawn, it may end up in your drinking water due to a sudden backflow. According to an US EPA study, a majority of homes have a water cross-connection to a health hazard.

In spite of regulations and building codes on backflow prevention, many products sold in stores to trusting homeowners do not meet them. Conspicuous among them are the old-school water-powered pumps that sit in the sump pit. Their discharge pipe is filled with sump water and they are likely to contaminate drinking water during a sudden loss of water pressure. The manufacturer's instructions recommend and some states require the use of an RPZ (Reduced Pressure Zone) Backflow Prevention Device, which costs over $150. Moreover, it restricts water flow to the pump and requires annual certification (about $60–80 each year).

Backflow Prevention Devices

Regardless of the pump design and setup, local authorities may insist on a special backflow prevention device.

Double check valve

Dual Check Valve – You can order the optional dual check valve. It contains two internal check valves to prevent backflow (reverse water flow) through the pump into the potable water system. No effect on water flow. Thread it directly onto the pump. It also acts as a union. No extra shipping cost when ordered with the pump.

Integral AVB vaccuum breaker

AVB – Or to satisfy the strictest local codes, order our optional integral Atmospheric Vacuum Breaker (AVB), which is approved by all backflow prevention authorities (ASSE listed 1001, IAPMO listed, CSA certified). We ship it factory-installed on the pump inlet. Note the pump must be installed horizontally. The discharge pipe from the pump must be sloping and self-draining – otherwise, the water would run out of the AVB valve. No extra shipping cost when ordered with the pump.

Save Time with the "Push-On" Plumbing Kit

Push-On plumbing kit

For homeowners who have never done any plumbing whatsoever but could handle a Lego set. Or for plumbers who want to save almost half of the installation time. No soldering, no torch, no glue, and no special tools! No fire hazards or burned fingers. You can tackle the job with a tubing cutter and a pair of channel pliers.

These state-of-the-art push-on fittings make connecting the backup pump to your 3/4" water service quick and easy. Just push a tube into the fitting until it reaches a positive "bottom" and it is sealed! Fast and easy secure connections. No frustrating leaks. If needed, you can turn the fittings to line them up properly. Each connection can be disassembled if needed. The kit includes:

sump pump T connection
  • 1 Tee to tap into the main 3/4" supply line    
  • 1 Ball shut-off valve
  • 1 Elbow
  • 8 Ferrules to reinforce PEX or CPVC piping
  • 4 Pipe hangers and 8 screws
  • 18" Flexible stainless steel tube
  • 1 Male adaptor for the pump

You need to buy straight lengths of 3/4" tubing – PEX or CPVC or copper piping. Using flexible piping, PEX or copper, reduces the number of needed elbows. Feel free to mix copper or PEX tubing. PEX has flexibility and a low price. One push-on elbow is included and you can order extra elbows if needed. The flexible stainless steel tube means that "close is good enough" when bringing the piping to the pump – it greatly saves on elbows and time. There is noextra shipping cost when ordered with the pump.

Unlike store-sold products, these fittings are the latest design – all-metal (brass), no plastic parts for maximum durability.