Davey RainBank Floatless Rainwater Harvesting Kit - Surface Pump, Mains Backup, WaterMark NZ

The Davey RainBank Floatless kit automatically selects your water source — using rainwater from your tank first, and switching seamlessly to mains water when the tank runs low. No float switch required. The controller detects positive pump pressure to confirm water is present in the tank, making installation simpler than a standard float-equipped system.

When rainwater is available the pump delivers it to your toilets, laundry, and garden. When the tank is empty, mains water flows through the RainBank without the pump running. In the event of a power outage, mains water continues to flow — no interruption to supply.

A built-in dual check valve meets the backflow protection requirements of AS/NZS 3500-1, protecting your mains water supply. No solenoid valves in the design — fewer parts, less to block.

Available in two models matched to your home's pressure needs. Select your model from the dropdown.

WaterMark WMTS-477:2016 (Lic WM-022042). Smart Approved WaterMark. Tested in compliance with AS/NZS 4020. Must be installed by a licensed plumber.

Bore water quality varies significantly. We recommend testing your bore water before selecting a filtration system — get in touch and we'll help you choose the right configuration for your supply.

Key specs at a glance

• Type: Floatless dual source rainwater harvesting controller kit
• Float required: No (optional external float can be added)
• Suitable for: Flooded suction applications only
• Max mains water pressure: 600 kPa
• Max water temperature: 50°C
• Mains inlet: ¾" BSP M | Rainwater inlet: 1" BSP M | Outlet: ¾" BSP M
• Controller: IP23, 220–250V, 50Hz
• Backflow protection: Built-in dual check valve (AS/NZS 3500-1)
• WaterMark WMTS-477:2016 (Lic WM-022042)
• Guarantee: 3 years

Choosing your model

KRB1NF — for single storey homes
Includes: RainBank controller + HP45-05 pump
Flow @ 200 kPa: 40 lpm | Max pump pressure: 350 kPa
Suitable for single storey homes with standard simultaneous demand.

KRB2NF — for double storey homes and higher pressure
Includes: RainBank controller + HS50-06 pump
Flow @ 200 kPa: 46 lpm | Max pump pressure: 480 kPa
Higher pressure output — suited to double storey homes and longer pipe runs.

Note: Floatless models require flooded suction — the lowest water level in the tank must remain above the top of the pump at all times to maintain pump prime.

Why Kiwi homeowners choose the Davey RainBank Floatless

• No float required — simpler installation with fewer components
• Rainwater used first automatically — no manual switching
• Seamless mains backup — no interruption when the tank runs dry
• Mains water flows through even during a power outage
• Built-in dual check valve — backflow protection included, not an add-on
• No solenoid valves — fewer moving parts, greater long-term reliability
• Intelligent leak detection — ignores small leaks to prevent nuisance pump cycling
• WaterMark certified and Smart Approved WaterMark
• External float can be added if your installation requires it
• 3-year guarantee backed by Davey's NZ dealer network

How it works

The RainBank controller sits between your rainwater tank, your mains supply, and your home's water outlets. When demand is detected, the controller checks whether rainwater is available. If the pump is primed (tank water is present), it starts the pump and delivers rainwater. If the tank is empty, mains water flows through the RainBank directly — without the pump running.

The floatless controller detects tank water availability by monitoring pump pressure at startup, eliminating the need for a float switch in the tank. An optional external float can be connected if your installation requires it.

Operating limits

Specification	KRB1NF	KRB2NF
Flow @ 200 kPa	40 lpm	46 lpm
Max pump pressure	350 kPa	480 kPa
Pump included	HP45-05	HS50-06
Pump output (P2)	0.55 kW	0.60 kW
Pump full load current	3.4A	3.8A
Max mains pressure	600 kPa
Max pump amps	12A
Mains inlet	¾" BSP M
Rainwater inlet	1" BSP M
Outlet	¾" BSP M
Pump inlet	1¼" BSP F
Max water temperature	50°C
Min water temperature	1°C
Max ambient temperature	50°C
Controller voltage	220–250V, 50Hz
Controller IP rating	IP23
WaterMark	WMTS-477:2016, Lic WM-022042
Guarantee	3 years

What's in the box

KRB1NF:

• 1 × RainBank floatless controller
• 1 × HP45-05 surface pressure pump
• Installation documentation

KRB2NF:

• 1 × RainBank floatless controller
• 1 × HS50-06 surface pressure pump
• Installation documentation

FAQ

What does the RainBank Floatless do?

It automatically manages two water sources — rainwater tank and mains supply — giving rainwater priority. When the tank has water, the pump delivers it. When the tank runs dry, mains water flows through without any manual intervention.

Why floatless?

A standard RainBank uses a float switch inside the tank to detect water level. The floatless version detects water availability by sensing pump pressure at startup — no float, no wiring into the tank, simpler installation. An external float can still be connected if your installation needs it.

What is flooded suction and why does it matter?

Flooded suction means the tank water level is always above the pump inlet — water flows to the pump by gravity, keeping it primed. Floatless RainBank models require this to work correctly. If your tank is at the same level or lower than the pump, use a surface mounted RainBank with float switch instead.

What happens when the tank runs empty?

Mains water flows through the RainBank to your outlets — the pump does not run. When rainwater returns to the tank, the system automatically reverts to rainwater priority. No button press, no manual reset required.

What happens during a power outage?

Mains water continues to flow through the RainBank passively — no pump, no controller power needed. The system fails safe to mains supply.

Does it protect against backflow?

Yes — a dual check valve is built into the controller, meeting the backflow protection requirements of AS/NZS 3500-1. No separate backflow device is required.

Does it need a plumber to install?

Yes — must be installed by a licensed plumber. This is a requirement of the WaterMark certification.

What's the difference between KRB1NF and KRB2NF?

The KRB2NF includes the higher-pressure HS50-06 pump — better suited to double storey homes and longer pipe runs. The KRB1NF includes the HP45-05 and suits single storey installations with standard pressure requirements.

What warranty applies?

3-year guarantee backed by Davey's NZ dealer network.