High-Flow Automatic Basement Flood Pump Kit | Evak Residox 750 - 10m

High-flow automatic basement flood pump kit for deep basements and heavy inflow

Clears a flooded basement at around 285 litres per minute, and does it on its own.

This FPS Engineered™ kit pairs the automatic EVAK Residox 750 with 10 m of 50mm reinforced suction and delivery hose, a brass non-return valve and a hose clip. Set the pump at the lowest point, run the hose to your discharge point and leave it. The automatic switch does the rest.

This is the top of our basement range, for the situations where a smaller pump cannot keep up: a deep basement, water coming in faster than it can be cleared, or a long uphill run to the nearest drain. At 330 litres per minute and 16 m of head, the Residox 750 has the capacity to stay ahead of a serious ingress rather than merely cope with it.

Part of our wider basement waterproofing and flood defence ranges.

At a glance

• Around 285 litres per minute: Through the 10 m of 50 mm hose supplied, at a typical 2 m lift. Roughly 17,000 litres an hour.
• 16 metres of head: Enough to lift out of a deep basement and still run a long way to the drain.
• Automatic float control: Starts and stops with the water, so the space stays protected when nobody is there.
• Built for abrasive water: Stainless steel case, cast iron housing and a Hytrel vortex impeller that tolerates grit and silt.
• Surface-safe rubber base: Sits directly on a finished floor without marking it, and needs no priming.

What's included

• 1 × EVAK Residox 750 automatic submersible pump, 230 V, with 10 m H07RN-F cable
• 1 × 10 m length of 50mm reinforced suction and delivery hose
• 1 × 50 mm brass non-return valve
• 1 × 40 to 60mm stainless-steel hose clip

The pump is supplied with its own 2 inch hose tail. 

How the kit connects

The Residox 750 has a 2 inch BSP female top discharge with a hose tail supplied. The brass non-return valve fits between the outlet and the hose, and the 50mm hose pushes fully over the tail and is secured with the clip.

Fitting the valve matters more here than on any other kit in the range. With 10 m of 50mm hose you have around 20 litres of water standing in the line, and on a basement job the discharge point is above the pump. Without a valve, all of it drains straight back into the space every time the float cuts out, so the pump starts again and moves the same water twice. On an automatic pump left running unattended, that means needless cycling and wasted motor life.

Automatic at floor level, not just automatic

Expected performance

Estimated flow through the supplied 10 m of 50mm hose with the non-return valve fitted. Uphill lift is measured from the water surface to the point where the hose discharges, so a domestic basement is typically 2 m to 4 m and a deep or split-level one 4 m to 6 m.

How fast will it clear my basement?

Work out the volume by multiplying floor area in square metres by the water depth in metres, then by 1,000. Times below are at a 4 m lift.

Estimated using the published Residox 750 curve, Hazen-Williams friction for 50 mm bore and a nominal loss across the non-return valve. Figures assume water is not still coming in. Where there is active ingress, the pump has to clear the standing water and keep pace with the inflow at the same time, so allow longer. The pump is rated for continuous running.

 

Technical specification

Why this pump for a basement

A basement that floods repeatedly is a harder job than a one-off garage flood, and it asks three things of a pump that a cheap submersible cannot give.

It has to keep pace with the inflow, not just empty the room. Water entering through a wall or up through a floor does not stop while you pump. 330 litres per minute gives you headroom to clear standing water and stay ahead of what is still arriving.

It has to lift the water out. A basement discharge point is above the pump by definition, often several metres, and then there is the run to the drain. 16 m of head covers a deep basement and a long horizontal run with capacity left over.

It has to survive the water it is given. Basement ingress carries grit, silt and building debris. The Hytrel vortex impeller passes 2 mm solids and resists abrasion, the cast iron housing takes the wear, and the stainless case handles the damp. The rubber base means it can sit on a finished floor without marking it, and it needs no priming.

Installation and use

• Set the pump at the lowest point of the floor or in the sump, on a firm level base, clear of loose debris and silt.
  
• Fit the non-return valve at the pump outlet.
• Run the hose to a foul drain or an approved discharge point, and avoid tight bends that will restrict the flow.
• Keep the plug and connections dry and above any possible water level, and never lift or suspend the pump by its cable.
  

Water quality limits

Frequently asked questions

How low will it pump automatically?

Far lower than a float-operated pump. The floor-level sensor rests on the ground rather than floating, so nothing switches off early and the floor is cleared to near-dry. For the absolute lowest finish, around 1 mm, a manual Residox under direct supervision still has the edge.

Do I need a control panel or any wiring?

No. The floor-level sensor is supplied already wired to the pump, so there is nothing to mount and nothing to wire in. Plug it in, lay the sensor on the floor and it is working.

Is a 110 V version available?

Not on the automatic. The Residox 400 and 750 Automatic are 230V only, because that is what suits the domestic and commercial mains installations they are designed for. If you need 110 V for site use through a transformer, choose a manual Residox instead.

Can I leave it in the basement permanently?

Yes, that is what the automatic float switch is for, and the pump is rated for continuous running. Check the float, intake and non-return valve periodically, because a pump nobody inspects is not reliable protection. For a habitable basement, a designed system with a backup pump and an alarm is the right answer rather than a single pump.

How is this different from the Automatic Home Basement kit?

Capacity. The home kit uses an SPP2 at 70 litres per minute and 6 m of head, which suits a domestic cellar with occasional modest ingress. This kit moves more than four times the water and lifts it nearly three times as high, so it is for deep basements, heavy inflow, or a long uphill run to the drain.

Why does the kit include a non-return valve?

Because 10 m of 50mm hose holds around 20 litres, and on a basement job the discharge point is above the pump. Without a valve, that water runs back into the basement every time the float cuts out, so the pump restarts and moves the same water again. The valve stops the cycling.

Do I need a bigger hose than the one supplied?

No. The 50 mm hose matches the pump's 2 inch outlet, which is what allows it to deliver around 285 litres per minute. Narrowing the discharge is the commonest way a capable pump is throttled: dropping to 32 mm bore would cost you nearly 30 percent of the flow.

Can it handle silty or muddy water?

Better than most. The Hytrel vortex impeller is abrasion resistant and passes solids to 2 mm, and the cast iron housing takes the wear.