On-Site Heat Pump Maintenance: Which Service Do You Need?
On-Site Heat Pump Maintenance: Which Service Do You Need?
On-Site Heat Pump Maintenance: Which Service Do You Need?
On-Site Heat Pump Maintenance: Which Service Do You Need?
On-Site Heat Pump Maintenance: Which Service Do You Need?
UK Heat pump Help Technical Team
Independent Heat Pump Engineer
If your heat pump needs attention, "book a service" isn't always the right first step.
We offer four separate on-site services, and each one exists because it solves a genuinely different problem: servicing, fault finding, optimisation and powerflushing. Booking the wrong one is one of the most common ways homeowners end up paying twice once for a visit that doesn't address what's actually wrong, and again for the visit that does. This guide walks through what each service actually involves, what it costs, and how to tell which one applies to you.
Why a heat pump isn't serviced the same way as a boiler
With a boiler, there's really only one kind of visit that matters the annual service, which exists mainly to check the appliance is safe and burning gas correctly. A heat pump doesn't have a burner or a flue, so that safety-focused model doesn't translate directly.
What a heat pump does have is a much larger number of settings that affect how efficiently it runs: flow temperature, weather compensation curves, buffer tanks, zone valves, TRVs, system balancing. None of these exist on a boiler in the same way, and none of them are "safety" issues they're efficiency issues, and they can quietly cost you money for months before anything looks obviously wrong.
That's the reason a single "heat pump service" product doesn't fit every situation. A heat pump that's due its yearly check needs something different from a heat pump that's throwing fault codes, which needs something different again from a heat pump that works fine but is expensive to run. Four services, four different problems.
Service 1: Heat Pump Servicing for the annual check, £150 + VAT
This is the one most homeowners already expect, and it's the closest equivalent to a boiler's annual service except it covers more ground, because there's more to check.
A standard on-site service includes:
Heat pump inspection
System pressure checks
Filters and strainers
Flow rate checks
Controls and settings review
General heat pump operation check
Heating system condition assessment
Identification of obvious efficiency or performance issues
Timing matters here more than people expect. We generally recommend booking this before the main heating season, ideally September or October, rather than mid-winter or during the summer when the system has been doing very little. Zone valves, TRVs and circulation components that haven't been exercised properly over summer are exactly the kind of thing that fails silently and the worst time to discover that is the first genuinely cold night of the year. We go into this in more depth in our guide on how often an air source heat pump should be serviced, including why manufacturer warranties usually require it annually regardless.
If anything turns up during the visit that needs further investigation, you'll get a clear price for that work before anything proceeds a standard service never turns into unplanned additional cost without your agreement first.
Service 2: Heat Pump Fault Finding from £50 initial video assessment
Fault finding is for when something is actually, demonstrably wrong: no heat, fault codes that keep returning, poor flow, cold rooms, or controls that simply aren't behaving the way they should. It's one of the most common reasons homeowners contact us, and as we cover in our guide on why a heat pump might not be reaching temperature the actual cause is very often not what people assume it is. A "faulty" heat pump quite frequently turns out to be a settings problem, not a hardware one.
Rather than sending an engineer out on the strength of a phone description, we start with a £50 video assessment. On that call, we look at your system together, talk through what's happening, and agree the right next step before committing to an on-site visit. If a visit or further investigation is needed, you get a clear, upfront price before anything is booked, and the £50 is deducted from that cost if you go ahead.
If you're outside our 50-mile on-site radius, or you'd simply prefer to stay remote, Fix My Heat Pump covers exactly the same diagnostic ground entirely over video, from £295, with no site visit required at all.
Service 3: Heat Pump Optimisation from £50 initial video assessment
This is the service most homeowners don't know exists, and it's often the one with the biggest impact on running costs. A heat pump can be technically fine no faults, nothing broken and still cost considerably more to run than it should, because of high flow temperatures, unnecessary complexity in the controls, or a heating system that was never properly balanced when it was installed.
Depending on your system, optimisation can include:
Removing unnecessary heating zones
Removing unnecessary buffer tanks
Removing or changing the use of TRVs
Simplifying heating controls
Adjusting weather compensation
Reducing flow temperatures where appropriate
Improving system flow rates
System balancing
Reviewing radiator and underfloor heating performance
Identifying installation or design issues affecting performance
Flow temperature is usually where the biggest gains hide. As a rough rule of thumb, reducing flow temperature by 1°C can improve efficiency by around 2–3%, though the real-world figure depends on the heat pump, the property and the weather. That means there can be a genuinely large gap in running cost between a system left at 50°C "because that's what it's always been set to" and one that's been properly configured to hold comfort at a lower temperature.
To do this properly rather than by guesswork, it helps to know how much heat the property actually needs which is what a room-by-room heat loss survey gives us: hard evidence of whether each room's radiators or emitters have enough capacity at an efficient flow temperature, rather than assumption. If you're still at the pre-installation stage and want to sense-check an installer's proposed design before committing to it, our pre-installation design review checks those same heat-loss assumptions and sizing decisions before any work begins.
As with fault finding, we start with a £50 video assessment and won't recommend an on-site visit unless we think it'll genuinely be worthwhile.
Service 4: Heating System Powerflushing from £450 + VAT
The fourth service is the one that's least about the heat pump itself. Poor circulation, cold radiators, blocked filters and system contamination can all hold back a perfectly good heat pump and this matters more here than with a boiler, because heat pumps rely on good flow at relatively low temperatures to stay efficient. Sludge that a boiler could partly power through will show up as underperformance on a heat pump much faster.
This is especially common where an existing radiator system was kept in place during a heat pump installation rather than replaced outright the pipework and radiators simply weren't clean to begin with. A professional powerflush includes flushing radiators and heating circuits, removing sludge and contamination, cleaning filters and strainers, checking circulation and flow through radiators, recommissioning and balancing the system, and adding the appropriate system inhibitor once it's done. Final pricing depends on the size, condition and complexity of the system, starting from £450 + VAT.
On-site vs remote: which route actually makes sense
Every service above is a one-off, in-person visit an engineer physically at your property. That's not always the right fit, and it's worth being honest about when it isn't.
On-site makes the most sense when a hands-on inspection genuinely changes the outcome: annual servicing, powerflushing (which can't be done remotely at all), and any fault finding or optimisation where the video call alone can't fully resolve the issue. Remote makes more sense when you're outside the coverage area, or when the problem is likely to be diagnosable from settings and symptoms alone which is a large proportion of fault-finding and optimisation cases.
If what you actually want isn't a single visit but ongoing cover, Heat Pump Service Plus is a different model entirely an annual service bundled with direct technical support throughout the year, so you're not starting from scratch every time something feels off. Our guide on what actually happens during a Service Plus visit walks through it step by step. Whichever route you take, the same principle holds: we're independent, we don't install heat pumps or take commission from anyone, so what you're told during a visit reflects what your system actually needs rather than what's easiest to sell.
How an on-site visit actually works
Tell us what you need. A short form or message describing your heat pump and what's happening.
We review your details. For fault finding and optimisation, that's the video call first. For a standard service or powerflush, we go straight to confirming details and booking a visit.
We visit your property. An experienced engineer attends, carries out the agreed work, and talks you through anything found along the way.
You know exactly what's next. Any further work comes with a clear price before it proceeds, and you're never obligated to use us for it we're just as happy handing our findings to your own plumber or electrician.
Where this applies
On-site visits only make sense within a realistic travel radius otherwise you're paying for someone to sit in traffic rather than work on your system. Coverage runs from Chelmsford out to roughly 50 miles: across Essex Colchester, Braintree, Witham, Maldon, Clacton-on-Sea, Basildon, Southend-on-Sea, Brentwood, Billericay and Harlow and into Suffolk as far as Sudbury, Haverhill, Bury St Edmunds, Newmarket and Ipswich. If you're just outside these towns, get in touch and we'll confirm whether we can reach you; further afield, remote services are available anywhere in the UK.
Frequently asked questions
Do I need a video call before every on-site visit?
Only for fault finding and optimisation. Standard servicing and powerflushing go straight to booking, since there's nothing to diagnose beforehand.
What if I book the wrong service?
Tell us what's happening and we'll redirect you before anything's scheduled the £50 fee for fault finding and optimisation exists partly so this gets caught early rather than on-site.
Can one visit cover more than one of these services?
Sometimes. A service visit that turns up a circulation problem, for example, may lead to a powerflush quote on the spot but you'd always get a price for that additional work before it goes ahead.
Not sure which on-site visit you need?
Tell us what's happening with your heat pump and we'll point you to the right one servicing, fault finding, optimisation or powerflushing rather than you having to guess.
If your heat pump needs attention, "book a service" isn't always the right first step.
We offer four separate on-site services, and each one exists because it solves a genuinely different problem: servicing, fault finding, optimisation and powerflushing. Booking the wrong one is one of the most common ways homeowners end up paying twice once for a visit that doesn't address what's actually wrong, and again for the visit that does. This guide walks through what each service actually involves, what it costs, and how to tell which one applies to you.
Why a heat pump isn't serviced the same way as a boiler
With a boiler, there's really only one kind of visit that matters the annual service, which exists mainly to check the appliance is safe and burning gas correctly. A heat pump doesn't have a burner or a flue, so that safety-focused model doesn't translate directly.
What a heat pump does have is a much larger number of settings that affect how efficiently it runs: flow temperature, weather compensation curves, buffer tanks, zone valves, TRVs, system balancing. None of these exist on a boiler in the same way, and none of them are "safety" issues they're efficiency issues, and they can quietly cost you money for months before anything looks obviously wrong.
That's the reason a single "heat pump service" product doesn't fit every situation. A heat pump that's due its yearly check needs something different from a heat pump that's throwing fault codes, which needs something different again from a heat pump that works fine but is expensive to run. Four services, four different problems.
Service 1: Heat Pump Servicing for the annual check, £150 + VAT
This is the one most homeowners already expect, and it's the closest equivalent to a boiler's annual service except it covers more ground, because there's more to check.
A standard on-site service includes:
Heat pump inspection
System pressure checks
Filters and strainers
Flow rate checks
Controls and settings review
General heat pump operation check
Heating system condition assessment
Identification of obvious efficiency or performance issues
Timing matters here more than people expect. We generally recommend booking this before the main heating season, ideally September or October, rather than mid-winter or during the summer when the system has been doing very little. Zone valves, TRVs and circulation components that haven't been exercised properly over summer are exactly the kind of thing that fails silently and the worst time to discover that is the first genuinely cold night of the year. We go into this in more depth in our guide on how often an air source heat pump should be serviced, including why manufacturer warranties usually require it annually regardless.
If anything turns up during the visit that needs further investigation, you'll get a clear price for that work before anything proceeds a standard service never turns into unplanned additional cost without your agreement first.
Service 2: Heat Pump Fault Finding from £50 initial video assessment
Fault finding is for when something is actually, demonstrably wrong: no heat, fault codes that keep returning, poor flow, cold rooms, or controls that simply aren't behaving the way they should. It's one of the most common reasons homeowners contact us, and as we cover in our guide on why a heat pump might not be reaching temperature the actual cause is very often not what people assume it is. A "faulty" heat pump quite frequently turns out to be a settings problem, not a hardware one.
Rather than sending an engineer out on the strength of a phone description, we start with a £50 video assessment. On that call, we look at your system together, talk through what's happening, and agree the right next step before committing to an on-site visit. If a visit or further investigation is needed, you get a clear, upfront price before anything is booked, and the £50 is deducted from that cost if you go ahead.
If you're outside our 50-mile on-site radius, or you'd simply prefer to stay remote, Fix My Heat Pump covers exactly the same diagnostic ground entirely over video, from £295, with no site visit required at all.
Service 3: Heat Pump Optimisation from £50 initial video assessment
This is the service most homeowners don't know exists, and it's often the one with the biggest impact on running costs. A heat pump can be technically fine no faults, nothing broken and still cost considerably more to run than it should, because of high flow temperatures, unnecessary complexity in the controls, or a heating system that was never properly balanced when it was installed.
Depending on your system, optimisation can include:
Removing unnecessary heating zones
Removing unnecessary buffer tanks
Removing or changing the use of TRVs
Simplifying heating controls
Adjusting weather compensation
Reducing flow temperatures where appropriate
Improving system flow rates
System balancing
Reviewing radiator and underfloor heating performance
Identifying installation or design issues affecting performance
Flow temperature is usually where the biggest gains hide. As a rough rule of thumb, reducing flow temperature by 1°C can improve efficiency by around 2–3%, though the real-world figure depends on the heat pump, the property and the weather. That means there can be a genuinely large gap in running cost between a system left at 50°C "because that's what it's always been set to" and one that's been properly configured to hold comfort at a lower temperature.
To do this properly rather than by guesswork, it helps to know how much heat the property actually needs which is what a room-by-room heat loss survey gives us: hard evidence of whether each room's radiators or emitters have enough capacity at an efficient flow temperature, rather than assumption. If you're still at the pre-installation stage and want to sense-check an installer's proposed design before committing to it, our pre-installation design review checks those same heat-loss assumptions and sizing decisions before any work begins.
As with fault finding, we start with a £50 video assessment and won't recommend an on-site visit unless we think it'll genuinely be worthwhile.
Service 4: Heating System Powerflushing from £450 + VAT
The fourth service is the one that's least about the heat pump itself. Poor circulation, cold radiators, blocked filters and system contamination can all hold back a perfectly good heat pump and this matters more here than with a boiler, because heat pumps rely on good flow at relatively low temperatures to stay efficient. Sludge that a boiler could partly power through will show up as underperformance on a heat pump much faster.
This is especially common where an existing radiator system was kept in place during a heat pump installation rather than replaced outright the pipework and radiators simply weren't clean to begin with. A professional powerflush includes flushing radiators and heating circuits, removing sludge and contamination, cleaning filters and strainers, checking circulation and flow through radiators, recommissioning and balancing the system, and adding the appropriate system inhibitor once it's done. Final pricing depends on the size, condition and complexity of the system, starting from £450 + VAT.
On-site vs remote: which route actually makes sense
Every service above is a one-off, in-person visit an engineer physically at your property. That's not always the right fit, and it's worth being honest about when it isn't.
On-site makes the most sense when a hands-on inspection genuinely changes the outcome: annual servicing, powerflushing (which can't be done remotely at all), and any fault finding or optimisation where the video call alone can't fully resolve the issue. Remote makes more sense when you're outside the coverage area, or when the problem is likely to be diagnosable from settings and symptoms alone which is a large proportion of fault-finding and optimisation cases.
If what you actually want isn't a single visit but ongoing cover, Heat Pump Service Plus is a different model entirely an annual service bundled with direct technical support throughout the year, so you're not starting from scratch every time something feels off. Our guide on what actually happens during a Service Plus visit walks through it step by step. Whichever route you take, the same principle holds: we're independent, we don't install heat pumps or take commission from anyone, so what you're told during a visit reflects what your system actually needs rather than what's easiest to sell.
How an on-site visit actually works
Tell us what you need. A short form or message describing your heat pump and what's happening.
We review your details. For fault finding and optimisation, that's the video call first. For a standard service or powerflush, we go straight to confirming details and booking a visit.
We visit your property. An experienced engineer attends, carries out the agreed work, and talks you through anything found along the way.
You know exactly what's next. Any further work comes with a clear price before it proceeds, and you're never obligated to use us for it we're just as happy handing our findings to your own plumber or electrician.
Where this applies
On-site visits only make sense within a realistic travel radius otherwise you're paying for someone to sit in traffic rather than work on your system. Coverage runs from Chelmsford out to roughly 50 miles: across Essex Colchester, Braintree, Witham, Maldon, Clacton-on-Sea, Basildon, Southend-on-Sea, Brentwood, Billericay and Harlow and into Suffolk as far as Sudbury, Haverhill, Bury St Edmunds, Newmarket and Ipswich. If you're just outside these towns, get in touch and we'll confirm whether we can reach you; further afield, remote services are available anywhere in the UK.
Frequently asked questions
Do I need a video call before every on-site visit?
Only for fault finding and optimisation. Standard servicing and powerflushing go straight to booking, since there's nothing to diagnose beforehand.
What if I book the wrong service?
Tell us what's happening and we'll redirect you before anything's scheduled the £50 fee for fault finding and optimisation exists partly so this gets caught early rather than on-site.
Can one visit cover more than one of these services?
Sometimes. A service visit that turns up a circulation problem, for example, may lead to a powerflush quote on the spot but you'd always get a price for that additional work before it goes ahead.
Not sure which on-site visit you need?
Tell us what's happening with your heat pump and we'll point you to the right one servicing, fault finding, optimisation or powerflushing rather than you having to guess.
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Contact Us
Not Sure Which Service You Need?
Not Sure Which Service You Need?
Not Sure Which Service You Need?
Not Sure Which Service You Need?
Not Sure Which Service You Need?
Whether you need help with an existing heat pump, a pre-installation review, cooling advice, servicing or a room-by-room heat loss survey, send us a few details and we'll point you in the right direction.
Whether you need help with an existing heat pump, a pre-installation review, cooling advice, servicing or a room-by-room heat loss survey, send us a few details and we'll point you in the right direction.
Whether you need help with an existing heat pump, a pre-installation review, cooling advice, servicing or a room-by-room heat loss survey, send us a few details and we'll point you in the right direction.
