Heat Pump Maintenance Checklist: The 2026 Essential Guide for London and Kent

A heat pump should be serviced at least once every 12 months by a qualified professional to ensure it operates within manufacturer tolerances [1, 4, 6]. For systems providing both heating and cooling, or those in coastal areas like parts of Kent where salt air can accelerate corrosion, more frequent inspections may be recommended to maintain peak performance [1, 5]. ## Why is regular maintenance essential for your heat pump? Much like an MOT for your car, an annual service is vital for your heat pump's longevity and efficiency [8]. Without regular care, a typical UK heat pump can lose 0.5–1.0% of its efficiency annually [9]. By keeping your system in top condition, you ensure it stays within 2% of its original Seasonal Coefficient of Performance (SCOP), which helps prevent your energy consumption from creeping up unnecessarily [4, 9]. Furthermore, most manufacturers require proof of annual servicing to keep your warranty valid [1, 9]. Skipping these checks could leave you liable for expensive repairs, such as compressor failures, which can cost between £800 and £1,500 to rectify [3, 9]. ## What does a professional heat pump maintenance checklist include? When you book a service with a qualified installer, such as those serving the London and Kent regions, the engineer will perform a comprehensive assessment [1, 9]. This typically includes: * A full visual inspection of the indoor and outdoor units [1]. * Performance diagnostics to ensure the system is meeting its design output [1]. * Refrigerant leak checks to ensure the system is sealed and environmentally safe [1, 7, 8]. * Electrical safety testing, including tightening connections to prevent faults [1, 7, 8]. * Cleaning of internal components to remove dust and debris [1]. * Verification of system pressure and flow rates [3, 4]. ## What can you do between professional visits? While the annual service must be performed by a professional, there are simple steps you can take to keep your system running smoothly: * Keep the outdoor unit clear: Ensure the area around your heat pump is free from leaves, garden waste, and snow. In London and Kent, where urban debris or coastal salt can accumulate, keeping the unit clear is vital for airflow [1, 5, 8]. * Monitor your filters: Check your indoor air filters every 1–3 months [5]. If they are clogged with dust, your system has to work harder, which can increase your energy usage [8]. * Check for obstructions: Ensure indoor vents are not blocked by furniture or curtains to allow for efficient heat distribution [5]. ## What are the costs involved? In 2026, you should budget between £150 and £250 for a standard annual heat pump service in the UK [3, 9]. While this is a higher upfront cost than a traditional gas boiler service (typically £80–£120), it is a necessary investment to protect your system's efficiency and warranty [3]. Remember that parts, such as replacement filters or refrigerant top-ups, are usually charged as an extra [1, 3]. ### Key Takeaways * Schedule a professional service every 12 months to maintain warranty and efficiency [1, 6, 9]. * Budget £150–£250 annually for professional maintenance [3, 9]. * Perform DIY tasks like clearing debris from the outdoor unit and cleaning filters every 1–3 months [5, 8]. * Always use an MCS-certified installer for your annual service to ensure work meets UK quality standards [9, 10].