Merley boiler sequence controller
Merley boiler sequence controller accessories
Merley boiler sequence controller installed

Boiler sequence controller for up to 15 modules in cascade or unison mode.

A common controls platform that can be used with the Wessex ModuMax mk3, Upton, Stratton mk2, Varmax and Purewell Variheat mk2 modular boilers.

Warranty 2 product item

Product information

    • Allows efficient control of commercial heating and hot water plant.
    • Reduce energy usage and save money on your heating gas bills through accurate load matching of a multiple boiler system.
    • Intelligent temperature control functions.
    • Reduces carbon emissions of system.
    • Ensures even use of boilers improving life expectancy.
    • Choice of hard wired or easy to install wireless sensors.
    • Choice of boiler control strategy including DHW management, standalone control or integration with a BMS.
    • Satisfies the Building Regulations recommended minimum standards.
    • 1% heating efficiency credit point available for sequential control of multiple boiler systems when replacing in existing buildings (Building Regs Part L).
    • Choice of loose kit for installation with plant room control panel or as a pre-housed unit for independent wall mounting.
    • Buy in confidence from a UK manufacturer with decades of commercial heating and hot water expertise.

Technical data

Rated voltage AC 230 V (±10%)
Rated frequency 50/60 Hz
Power consumption RVS63.243: 10 VA
Fusing of supply lines max. 10 AT


Merley sequence controller brochure

Product brochures 1844 kb

Merley boiler sequence controller installation manual

Installers guides 3686 kb

Ideal uses/applications

  • Multiple boiler systems.

Optional extras

  • Loose kit controller.
  • External air sensor.
  • Choice of room sensors.
  • Hard wired controls.
  • Wireless controls.
  • Domestic hot water sensor.
  • Strap on flow temperature sensor.

Often bought with

Upton modular boiler

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Wessex ModuMax mk3 boiler

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Varmax floor standing boiler

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Purewell Variheat mk2 condensing cast iron boiler

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Case studies

Stanmore Place benefits from an expandable and space-saving modular boiler solution  from Hamworthy.

Stanmore Place, London

Sector: Residential and commercial, community heating

Project: This award-winning development chose Wessex ModuMax boilers to save space and match the requirements of their district heating network.

Building: Flagship development of apartments, houses and offices

Application: Space heating 7900kW, domestic hot water

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