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    Honeywell V4073A V4073 (Honeywell: Special Offer V4073A1039 22mm V4073A 1039)
    Honeywell V4073A V4073 (Honeywell: Special Offer V4073A1039 22mm V4073A 1039)
Honeywell Controls Honeywell V4073A V4073 (Honeywell: Special Offer V4073A1039 22mm V4073A 1039)
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V4073A Motorised Midposition Diverter Valve

The V4073A Valve has been designed to control the flow of water in domestic central heating systems, where both radiator and hot water cylinder circuits are pumped. It is typically suited for small to medium sized installations.

The V4073A Mid-position Diverter Valve should be used in conjunction with a room thermostat and cylinder thermostat to provide full temperature control of a conventional, fully pumped central heating installation. When used in this way, the control system is known as Sundial Y Plan and the components can be connected together using the Sundial Plan Wiring Centre which has dedicated terminations and there is no need for a wiring diagram.

An alternative method of wiring is to use the Honeywell 10-way Junction Box (42002116-002) together with the Honeywell Sundial Plans Wiring Booklet.


  • Spring return action
  • Three position operation
  • Powerhead replaceable without draining down
  • Manual lever for filling/draining down
  • Quiet operation, minimal power consumption
  • Provides electrical output to boiler and/or pump


  • 22mm/28mm or 3/4", 1" connections
  • Replacement motor/powerhead/ball and 'O' ring kit

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A Leading supplier for domestic and heating controls, Honeywell produce a top quality range of plumbing parts and accessrories for JTM plumbing. Choose from our range of programmers, timers and thermostats on JTM Plumbing today. Honeywell have been a top manufacturer since 1886 when the brand first began producing its top quality parts. Take a look at JTM Plumbing for a great range of Honeywell plumbing parts and fittings. 

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