Engineer commissioning a newly installed heat interface unit in a London development
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    HIU Commissioning London

    HIU commissioning across London and the M25 for new developments, retrofit schemes and units replaced individually. Commissioning is where a heat network either achieves its design performance or quietly fails to for the next twenty years. We set flow rates, configure setpoints, set the differential pressure control valve, prove the unit closes down fully on no demand and record the achieved values unit by unit, so the scheme has real commissioning data rather than a tick sheet.

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    Planned commissioning visits arranged around handover dates

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    Gas · Boilers · Heating · HVAC

    Related specialist help

    HIU balancingRiser and scheme balancing alongside commissioning.HIU flushingPre-commission cleaning of new pipework.

    What our hiu commissioning covers in London

    • Commissioning of new and replacement heat interface units
    • Design flow rates set and verified at each unit
    • DHW and heating setpoints configured to specification
    • Differential pressure control valves set and recorded
    • Return temperature verified against network targets
    • Full-close and keep-warm function proven
    • Unit-by-unit commissioning records issued
    • Whole-block commissioning programmes for developments

    What HIU commissioning involves

    We work to the manufacturer commissioning sheet and the scheme specification together. Flow rates are set and measured, not assumed. The differential pressure control valve is set to the value the design calls for at that position on the riser. Setpoints are configured, and then the unit is run through DHW and heating demands with the achieved temperatures recorded. Finally we prove the unit shuts fully so it is not bleeding heat into the return when idle.

    • Manufacturer commissioning sheet completed per unit
    • Design flow rate set and measured
    • DPCV set to design differential
    • DHW and heating setpoints configured
    • Achieved temperatures and return temperature recorded
    • Full-close on zero demand proven

    Why commissioning quality decides network performance

    Heat networks live or die on return temperature. A scheme commissioned properly returns water cool, so the plant runs efficiently and pumping costs stay low. A scheme where units were left at factory defaults returns water hot, and every resident pays for it through standing charges for the life of the building. Commissioning is the cheapest performance intervention available on any heat network.

    • Low return temperatures protect plant efficiency
    • Correct setpoints prevent resident complaints at handover
    • Balanced units stop upper-floor underperformance
    • Recorded data gives a baseline for future servicing

    Recommissioning existing schemes

    Older schemes rarely have usable commissioning data, and years of repairs leave units at mismatched settings. We recommission existing blocks unit by unit, bringing setpoints, DPCV settings and flow rates back to a consistent standard and producing the asset and performance record the managing agent should have had from day one.

    • Survey and record existing settings
    • Reset to consistent scheme-wide values
    • Identify units needing repair before recommissioning
    • Full asset register and commissioning pack issued

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    FAQ

    HIU Commissioning — frequently asked questions

    Related services

    HIU Balancing

    Riser and unit balancing to design flow

    HIU Installation & Replacement

    New and replacement heat interface units

    HIU Repair London

    Emergency and same-day HIU breakdown repair

    HIU Servicing

    Annual planned maintenance for heat interface units

    HIU Fault Finding

    Diagnostics before any parts are replaced

    Communal HIU Maintenance

    Block-wide contracts for managing agents

    Browse every service on our full services directory.

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    Need immediate assistance or want to schedule a service? Contact our experienced team of Gas Safe registered engineers for domestic and commercial work.

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