Additional Information

Site Information

  • Mains Water Top-up Controller Kit
  • Mains Water Top-up Controller Kit with main parts annotated
  • Tundish with Stainless Steel Wall Bracket to maintain an Air Gap
  • Solenoid Valve and Tundish with Stainless Steel Wall Bracket

Mains Water Top-up Controller Kit


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Product Description

Water Tank Level Controller for Fast Mains Water Tank Filling and Top-up

For use with automatic pumps to top-up Rainwater Harvesting Tanks with mains water.

The 3P TCS5JB Top-up Switch is intended to maintain the level of water in a water tank by topping up the tank when the level becomes low, with a measured amount of mains water.

Water level in the tank is sensed via a float switch, mains water is added via a high flow solenoid valve feeding back to the rainwater tank.

The solenoid will be activated when the float switch hangs down at approximately 45  or more, the top-up cycle will then continue until the float switch reaches an upward angle of approximately 45 degrees, ensuring a measured quantity of water is introduced to the tank.

1/2” and 3/4” versions are supplied with a tundish and mounting bracket meeting the requirements of BS EN 13076, versions 1” and above require an air gap to be formed during installation.

Included Components

  • 15m Float-switch with weight and connector.
  • TCS5JB Control Box.
  • Solenoid valve with 2 metre cable.
  • Tundish and bracket with elbow, back-nut and double nipple (1/2” and 3/4” versions).
  • 1.8 metre power cable with moulded plug.
  • Installation and Operation Manual.

Technical Information

Control Unit

  • Dimensions: 130 x 94 x 57mm (excluding cable entries)
  • Supply Voltage: 230-240VAC
  • Power Consumption: 0w
  • Supply Cable: 2m
  • Output: 10A Max @ Supply Voltage
  • Ingress Protection: IP66
  • Electrical Protection: Class 2
  • Material: Polystyrene


  • Supply Voltage: 230-240VAC
  • Power Consumption: 5.5VA to 20VA
  • Supply Cable: 2m
  • Medium: Clean Water
  • Function: Normally Closed (NC)
  • Max Pressure: 12 bar
  • Ingress Protection: IP54 or above
  • Material (Valve Body): Brass
  • Material (Diaphragm): EPDM


TCS5JB Mains Water Top-up Controller Brochure (pdf)

Included Components

The TCS5JB Controller comes with:

  • Control Box
  • Solenoid Valve
  • Tundish with Stainless Steel Wall Bracket
  • Float Switch with Counterweight
  • Installation & Operation Manual (including wiring diagram)

Other Parts Required

  • Screws or fixings to mount panel and Tundish Bracket

This product needs to be installed by installed and serviced by a competent electrical technician.

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