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

The Davey RainBank surface pump kit with float switch automatically selects your water source — using rainwater from your tank first, and switching seamlessly to mains water when the tank runs low. The float switch inside the tank detects water level, triggering the pump when rainwater is available and switching to mains when the tank empties.

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.

A built-in dual check valve meets the backflow protection requirements of AS/NZS 3500-1. No solenoid valves in the design.

Available in six models across two float entry types (top and side) and four pump sizes — from single storey to multi-storey and high-demand properties. 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: Surface pump dual source rainwater harvesting kit with float switch
• Float type: Top entry (KRB1, KRB2, KRB3, KRB4) or side entry (KRB1F, KRB2F)
• Max mains water pressure: 900 kPa
• Max pump 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

Step 1 — Choose your flow and pressure requirement

KRB1 / KRB1F — for single storey homes
Pump: HP45-05 | Flow @ 200 kPa: 40 lpm | Pressure: standard

KRB2 / KRB2F — for double storey homes and higher pressure
Pump: HS50-06 | Flow @ 200 kPa: 46 lpm | Pressure: higher

KRB3 — for multi-storey homes and larger families (top entry only)
Pump: HM60-08 | Flow @ 200 kPa: 60 lpm | Pressure: higher
Note: HM models require flooded suction applications.

KRB4 — for large homes and high-demand applications (top entry only)
Pump: HM90-13 | Flow @ 200 kPa: 80 lpm | Pressure: higher
Note: HM models require flooded suction applications.

Step 2 — Choose your float entry type

Top entry float (KRB1, KRB2, KRB3, KRB4): Float switch enters from the top of the tank. Easy system access for maintenance and servicing. Leak from the float lead is visible externally.

Side entry float (KRB1F, KRB2F): Float switch enters from the side of the tank. Suits installations where top entry is not practical.

Not sure which model suits your home? Get in touch and we'll help you choose.

Why Kiwi homeowners choose the Davey RainBank surface kit

• Float switch detects tank water level precisely — works with suction lift and flooded suction
• 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 reliability
• Intelligent leak detection — ignores small leaks to prevent nuisance pump cycling
• Top or side entry float options to suit your tank configuration
• WaterMark certified and Smart Approved WaterMark
• 3-year guarantee backed by Davey's NZ dealer network

Operating limits

Specification	Detail
Max mains flow rate	100 lpm
Max pump flow rate	100 lpm
Max mains water pressure	900 kPa
Max pump pressure	600 kPa
Max pump amps	10A
Max water temperature	50°C
Min water temperature	1°C
Max ambient temperature	50°C
Mains water inlet	¾" BSP M
Rainwater inlet	1" BSP M
Outlet	¾" BSP M
Controller voltage	220–250V, 50Hz
Controller IP rating	IP23
Float lead — top entry	9m
Float lead — side entry	5m
WaterMark	WMTS-477:2016, Lic WM-022042
Guarantee	3 years

What's in the box

KRB1 / KRB1F: RainBank controller with float switch (top or side entry) + HP45-05 pump + installation documentation

KRB2 / KRB2F: RainBank controller with float switch (top or side entry) + HS50-06 pump + installation documentation

KRB3: RainBank controller with top entry float switch + HM60-08 pump + installation documentation

KRB4: RainBank controller with top entry float switch + HM90-13 pump + installation documentation

FAQ

What's the difference between the floatless and float switch RainBank?

The floatless models (KRB1NF/KRB2NF) detect water availability by sensing pump pressure — suited to flooded suction only. The float switch models use a physical float inside the tank to detect water level, and can work with both flooded suction and suction lift. If your tank is at or below pump level, you need the float switch version.

What's the difference between top entry and side entry float?

Both detect the same thing — tank water level. Top entry is the preferred installation type for most situations: easier access for maintenance and any leak from the lead is visible. Side entry suits installations where top access to the tank is not practical.

What happens when the tank runs empty?

Mains water flows through the RainBank to your outlets — the pump does not run. When rainwater returns, the system automatically reverts to rainwater priority.

What happens during a power outage?

Mains water continues to flow through the RainBank passively — no pump or controller power needed.

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.

Why do the KRB3 and KRB4 require flooded suction?

The HM Series pumps used in KRB3 and KRB4 are suited to flooded suction applications. If your installation involves suction lift, choose KRB1 or KRB2 with the HP or HS pump instead.

Does it need a plumber to install?

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

What warranty applies?

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