Chesil pressurisation unit for sealed systems

Wall hung and floor standing pumped pressurisation units for heating and chilled sealed systems.

Available in 5 models with single and twin pump options.

Warranty 2 product item
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Product information

    • Choice of floor standing or wall hung models giving greater flexibility in plant room design.
    • Removes the need for cold water header tank and eliminates reliance on mains pressure to provide the system head.
    • Standard controls or electronic controls provide enhanced user interface through 16 character back-lit LCD display.
    • Pressurisation unit models with electronic controls provide enhanced system monitoring capability.
    • Cold fill pressures of up to 3.4 bar.
    • Automatic system safety shut down and interlock in the event of a system fault.
    • Wide choice of compatible Burstock expansion vessels with sizes from 25 litres to 2000 litres.
    • Maintains minimum pressure requirements of low / medium temperature sealed heating sealed systems (you can read about the differences of Sealed 'v' Open Vented heating systems here).
    • Suitable for constant pressure requirements of chiller systems.
    • All models compatible with Building Management Systems (BMS).
    • Buy in confidence from a UK manufacturer with decades of commercial heating and hot water expertise.
    • BIM objects available to assist in design and management.

Technical data

Units FSS
Configuration Floor standing
Pump Single
Controls Standard
General data
Weight (empty) kg 23
Weight (full) kg 30.6
Maximum cold fill pressure bar 3.4
Minimum cold fill pressure bar 1.00
Maximum water flow rate l/min 6.0
Maximum water flow rate @maximum cold fill pressure l/min 0.1
Noise level dBA <60 @ 1 metre
Electrical supply 230 V AC 50Hz 1Ph
Pressure switch contact rating 15 A 230 V AC
Volt free contact rating N/A
Start current (per pump motor) Amps 9
Run current (per pump motor) Amps 2.8
Factory Settings
Cold fill pressure bar 1.8
Low pressure switch setting bar 1.3
High pressure switch setting bar 3.6
Expansion vessel charge pressure bar 1.7
System parameters for factory settings
Maximum water flow temperature °C 82
Maximum static height m 16.5
Minimum system operating pressure bar 3.3
Maximum system operating pressure bar 7
Safety relief valve setting (Not HHL supply) bar 4
Nominal pressure differential bar 0.2
Mains cold water inlet inch ½” BSP
Overflow (polythene pipe) diameter mm 32
System connection compression fitting, diameter mm 15


Chesil pressurisation unit and Burstock expansion vessel brochure

Product brochures 4381 kb

Chesil electronic pressurisation unit installation manual

Installers guides 717 kb

Chesil standard pressurisation unit installation manual

Installers guides 863 kb

Chesil floor standing pressurisation unit

CAD 54 kb

Chesil wall hung pressurisation unit

CAD 55 kb

Ideal uses/applications

Optional extras

  • There are no optional extras for this product.

Often bought with

Burstock expansion vessel

Learn more

Case studies

Braithwaite House refurbished their heating system with Hamworthy's efficient pressure jet boilers.

Braithwaite House, London

Sector: Residential

Project: This 108 dwelling residential building in London needed a long-lasting boiler that could cope with the high heating demands placed on it.

Building: Social housing refurbishment

Application: Space heating 1,020kW

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Christchurch Police Station installed four of Hamworthy's oil-fired steel boilers.

Christchurch Police Station

Sector: Public sector

Project: Steel boilers from Hamworthy were the ideal solution for this dual-purpose building in Dorset.

Building: Dual-purpose building – police station and adult education centre

Application: Space heating

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Pitfield Street is a mixed used development which now benefits from a liquid biofuel boiler.

Pitfield Street, London

Sector: Residential and commercial

Project: A 100% liquid biofuel boiler proved to be the greenest heating option for a city centre development consisting of 16 flats and a commercial unit.

Building: New build flats and retail space

Application: Space heating. Renewable energy

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The Walton Communicy Hospital benefits from a modular boiler installation.

Walton Community Hospital

Sector: Hospital

Project: A community hospital in Walton-on-Thames chose a complete Hamworthy Heating package for their hospital heating and hot water refurbishment.

Building: Community hospital boiler room refurbishment

Application: Space heating 600kW, domestic hot water 1000l

Learn more