Commercial Boiler Service & Repair London

Our commercial boiler maintenance services are designed for organisations that manage heating and hot water systems across commercial, public, and multi-occupancy buildings. We work closely with clients who require reliable performance, regulatory compliance, and long-term system efficiency. Our service approach supports both single and multi-site estates and is tailored to each site’s plant configuration and operational requirements.

• Facilities Managers – We work alongside facilities management teams to maintain compliance with gas safety regulations and system performance standards. Our service visits are scheduled to minimise disruption, and we provide full documentation to support audits, insurance inspections, and planned preventative maintenance records.
• Property and Estate Management Companies – We support property managers responsible for residential blocks, offices, and mixed-use developments. Our maintenance programmes reduce breakdown risks, protect long-term plant investments, and help ensure consistent heating and hot water delivery across sites. We also assist with record keeping and service history documentation to support client reporting and asset management.
• Landlords and Freeholders – For building owners and landlords with responsibilities under the Landlord and Tenant Act or HMO licensing schemes, we offer routine servicing that ensures safe boiler operation and supports warranty protection. By identifying faults early, we help prevent expensive repairs and unplanned system failures.
• Schools, Care Homes, and Charities – We understand the unique requirements of sensitive environments. Our engineers are experienced in working during term-time access windows or low-occupancy periods to reduce disruption. We provide assurance on safety and system reliability in settings where downtime must be avoided, such as care homes, SEN schools, or supported housing.
• Managing Agents and Building Consultants – We act as a trusted servicing partner for agents and consultants managing compliance or overseeing capital projects. For systems we have installed, we provide post-installation maintenance, performance monitoring, and servicing aligned with lifecycle planning. Our reporting includes recommendations for future works and integration with wider facilities strategies.

Our commercial boiler maintenance service is built around safe operation, long-term reliability, and compliance with statutory and manufacturer requirements. Each visit follows a structured process, tailored to the system’s age, size, condition, and complexity. We maintain a wide range of gas-fired commercial boilers and plant room systems in line with industry best practices.

Core Boiler Servicing Tasks

Each maintenance visit includes the following checks and servicing operations:

• Visual Inspection of Boiler and Ancillary Equipment
  We check all accessible components for signs of wear, leaks, corrosion, or mechanical fatigue. This includes pipework, seals, insulation, and casings.

• Combustion and Flame Safeguard Testing
  Flame detection systems, ignition modules, and gas valves are tested to verify safe startup, shutdown, and running conditions. We also check safety interlocks, limit stats, and overheat protection.

• Cleaning of Burners and Filters
  Burner assemblies are removed and cleaned to ensure clean combustion and reduce emissions. Filters are inspected and replaced or cleaned as needed to maintain flow and combustion air quality.

• Expansion Vessel and Pressurisation Checks
  We test vessel charge pressure and examine pressurisation units for correct fill sequence, leakage, or pump failure. If necessary, we isolate and recharge expansion vessels using calibrated gauges.

• System Pressure, Flow and Temperature Monitoring
  Pressures and temperatures are measured at key points to identify blockages, pump issues, or signs of scaling and airlock. Flow and return temperatures are logged and assessed for imbalance.

• Control System Function Testing
  Thermostats, time controls, actuator valves, and BMS interfaces are tested for correct sequencing and control logic. We also check for fault codes and manual overrides that could disrupt performance.

• Service Reporting and Recommendations
  Each visit includes a written service report detailing work completed, test readings, equipment condition, and any issues requiring further attention. Reports are issued digitally and can be stored centrally for audit purposes.

Our maintenance contracts typically include plant room systems beyond the boiler itself. We maintain all major components to ensure safe and efficient system performance.

• Boilers and Calorifiers
  Servicing includes ignition checks, flue inspections, flow verification, and checking for limescale build-up or thermal stratification in hot water systems.

• Pressurisation Units and Vessels
  We test vessel pressure, verify pump performance, inspect fill and vent valves, and confirm correct control response.

• Dosing Pots and Water Treatment Systems
  Inhibitor levels are tested, topped up where necessary, and dosing pots are inspected for leaks or blockages. We assess overall system water quality and evidence of internal corrosion.

• Circulators, Valves, Gauges and Sensors
  Circulation pumps are checked for noise, vibration, and flow performance. Valves are tested for correct modulation, and sensors and gauges are verified for accuracy.

• Gas Interlock Systems and BMS Panels
  Gas interlocks are tested for proper cut-off function in the event of fan or ventilation failure. BMS inputs and outputs are reviewed where relevant and control setpoints verified.

Our service procedures follow manufacturer guidelines and comply with Gas Safe and industry standards. If faults are identified that fall outside routine servicing, we provide separate quotations for remedial work.

Faulty or neglected commercial boilers can waste significant amounts of energy and produce higher levels of emissions. Our service and repair work restores correct combustion, improves burner performance, and addresses circulation issues that lead to heat loss. Where components are replaced, we remove old parts through licensed waste carriers who recycle appropriate materials. We aim to bring systems back to optimal efficiency and help clients reduce fuel bills while maintaining environmental compliance.

We respond to servicing and repair requirements in commercial settings, often involving diagnostic and remedial work to extend system life and ensure safety.

• Office Building in West London – £5,800
  Full service and parts replacement for booster pumps, pressurisation units, and dosing systems in a dual plantroom system. This included diagnosing faults, correcting valve performance issues, and recommissioning to manufacturer settings.

• Residential Estate in South West London – £5,800
  Diagnostic and repair works across multiple boiler systems. Serviced Grundfos circulation pumps, pressurisation sets, dosing pots, control panels and solenoid valves. Works restored stable operation after recurring low-pressure faults.

• Commercial Premises in East London – £2,600
  Carried out LTHW lab testing, chemical dosing, and Legionella water sampling, followed by remedial water treatment works. This allowed the site to meet ongoing compliance requirements without full system shutdown.

We offer responsive and reliable commercial boiler servicing and repairs throughout London. Whether your system has lost pressure, failed to ignite, or is running inefficiently, we diagnose and resolve faults using a practical, methodical approach. Our engineers are trained to work on a range of boiler makes and models, and we use genuine parts to maintain performance and safety. For systems we have installed, we provide ongoing technical support and post-installation servicing.

All boiler servicing and repair work is carried out by Gas Safe registered engineers with experience across a wide range of commercial boiler systems. We follow approved methods for diagnostics, part replacement, and combustion analysis. Any gas safety or pressure testing is conducted using calibrated equipment in accordance with industry standards. We issue repair notes and servicing records to support compliance with safety, insurance, and maintenance documentation requirements.