Viessmann is a name that carries serious weight in the heating world, and their Vitocal range of air source heat pumps has earned strong praise from UK homeowners and independent reviewers alike. In this Viessmann heat pump review, we cover everything you need to know before making a decision.
Viessmann Heat Pumps: Key Facts
Here is everything that matters at a glance. The table below gives you the headline information across the full Viessmann air source heat pump range so you can start comparing before we dig into the details.
| Category | Details |
| Brand | Viessmann Climate Solutions (founded 1917, Germany) |
| Main UK Product Range | Vitocal 100-A, Vitocal 150-A, Vitocal 151-A, Vitocal 200-A, Vitocal 222-A, Vitocal 350-A |
| Efficiency Rating (SCOP) | 3.87 to 5.8 depending on model and flow temperature |
| Energy Label | Up to A+++ |
| Unit Cost (ex. installation) | £2,245 to £9,000+ depending on model and output |
| Full Installed Cost | £10,000 to £18,000 |
| After BUS Grant (£7,500) | From approximately £2,500 to £10,500 net |
| Installation Labour Cost | £2,500 to £5,000 |
| Annual Running Costs | Around £840 to £1,200 per year at standard tariff |
| OVO Heat Pump Plus Savings | Up to £350 per year on running costs via the OVO tariff partnership |
| Trustpilot Rating | 4.4 out of 5 stars from over 5,000 reviews (75% rated 5 stars) |
| Which? Rating | Check current listings at which.co.uk for up-to-date assessments |
| Standard Warranty | 2 years standard; extendable to 7 years (Vitocal 150-A), or 10 years on Vitocal 150-A and 151-A |
| Servicing Requirements | Annual service recommended; typically £100 to £200 per year |
| Best Property Types | New builds with underfloor heating (100-A), well-insulated retrofits, older properties with larger radiators (150-A HT), larger homes and light commercial (350-A) |
| MCS Certified | Yes (required for Boiler Upgrade Scheme eligibility) |
| Available Sizes | 4 kW to 20 kW (residential); larger commercial units available |
| Operating Temperature | Down to -20°C outside |
| Refrigerant | R32 (Vitocal 100-A) and R290 (Vitocal 150-A onward) |
Are Viessmann Heat Pumps Worth It?
Viessmann heat pumps are worth it for homeowners who want a premium, long-established European brand with a strong real-world efficiency track record and one of the most flexible warranty programmes in the UK market. Here is a bit of background on the company before we weigh up the strengths and weaknesses.
Viessmann has grown into one of Europe’s most respected names in sustainable heating and energy systems. Their Vitocal range of air-to-water heat pumps is designed and engineered specifically for the European climate, with genuine cold-weather performance that stands up to UK winters.
With over 5,000 Trustpilot reviews averaging 4.4 out of 5 stars, and 75% of those reviews rating Viessmann at 5 stars, the brand consistently performs above the industry norm for customer satisfaction. When you compare that to the Daikin heat pump, which holds a 4 out of 5 star Trustpilot rating from a smaller base of over 2,200 reviews, Viessmann’s customer feedback record is notably stronger.
Pros and Cons of Viessmann Heat Pumps
Pros:
- Over 100 years of heating expertise behind the brand, with a strong reputation across Europe
- Real-world SCOP averages of 3.96 across independent monitoring, with top installations achieving 4.5 and above
- The Vitocal 150-A and 151-A models are available with an extendable warranty of up to 10 years, one of the best in the residential market
- Partnership with OVO Energy allows Vitocal 150-A and 151-A owners to access electricity at 15p per kWh, saving up to £350 per year on running costs
- Uses R290 (propane) refrigerant on the Vitocal 150-A range, which is among the most environmentally friendly options available
- Wide model range from compact 4 kW units up to 20 kW, covering most UK residential property types
- Smart ViCare app control included, enabling remote monitoring and scheduling
- Strong installer network across the UK, including Kent
- 4.4 out of 5 stars on Trustpilot from over 5,000 reviews, with 75% awarding a full 5 stars
Cons:
- Higher unit and installation costs compared to some competitors, with full installs reaching up to £18,000
- The standard 2-year warranty on the Vitocal 100-A is notably short and does not have an extension option
- Extended warranty beyond 2 years on Vitocal 150-A requires additional cost (£360 for 7-year extension) and must be registered within 30 days by a Viessmann Trained Installer
- Some homeowners report that finding a Viessmann Trained Installer locally can take time in more rural parts of Kent
- Vitocal 350-A commercial units carry a very high price tag that puts them outside the reach of most domestic budgets
- The COP figure of 4.57 at peak conditions, while strong, is slightly behind the very best performers such as the Panasonic Aquarea in certain real-world tests
How Efficient Is a Viessmann Heat Pump?
The efficiency of a Viessmann heat pump is genuinely impressive, and importantly, that efficiency holds up in real homes, not just in manufacturer testing facilities. For homeowners across Kent, that distinction really matters.
An independent platform called the Heat Pump Monitor tracks the real performance of heat pumps installed in ordinary homes across the UK. Data from this platform shows Viessmann Vitocal 150-A heat pumps achieving an average SCOP of 3.96, one of the highest averages of any brand tracked.
In plain terms, for every £1 of electricity spent, Viessmann owners are getting back nearly £4 of heat, consistently, season after season, in real houses with real weather.
The top seven Vitocal 150-A installations recorded through the Open Energy Monitor’s independent performance competition achieved an average SCOP of 4.1, and many others on the platform regularly hit 4.5 and above. To put that in context, the average across all heat pump brands on the platform is 3.87. Viessmann consistently beats that average.
A gas boiler, even a brand new one, converts roughly 90p in every £1 of gas into heat. A heat pump with a SCOP of 4.0 converts £4 worth of heat from that same £1 of electricity. That is the difference between 90% efficient and 400% efficient.
No gas boiler on the market can match that, full stop.
How It Compares to Other Brands
The Vaillant arotherm plus performs at a similar real-world level to the Viessmann Vitocal 150-A, and both are consistently ahead of the UK market average. The Mitsubishi Ecodan also performs well in independent real-world testing and is a reliable option.
Where Viessmann pulls further ahead is on running costs, because Viessmann Vitocal 150-A and 151-A owners can access the OVO Heat Pump Plus energy tariff, which charges just 15p per kWh for heat pump electricity. Mitsubishi does not currently offer an equivalent deal, so even if the raw efficiency figures are similar, Viessmann owners can end up paying noticeably less each year for the same amount of heat.
Flow Temperature and Efficiency
The lower the temperature your heating system needs to run at, the more efficient your heat pump will be. Viessmann’s Vitocal 150-A, running at a low temperature of 35°C (ideal for underfloor heating), can achieve a COP of up to 5.8 according to product specifications. At higher flow temperatures of 55°C, the efficiency will be lower but the system can still deliver meaningful savings over a gas boiler.
For homes in Tonbridge, Sittingbourne or Maidstone that still have older radiator systems, Viessmann’s higher-temperature capable models mean that a full system upgrade is not always necessary before you can benefit from a heat pump.
Viessmann Heat Pump Range?
The Viessmann heat pump range for UK residential properties centres on the Vitocal series, with distinct models built for different property sizes, age groups and heating requirements. Whether you are fitting out a new build in Sevenoaks or retrofitting a period property in Faversham, there is a Vitocal model suited to your situation.
| Model | Type | Output Sizes | Refrigerant | Best For | Unit Price (approx.) |
| Vitocal 100-A | Monobloc, air-to-water | 6–16 kW | R32 | Budget-conscious buyers, smaller homes | £2,245 to £3,864 |
| Vitocal 150-A Standard | Split system, air-to-water | 4–16 kW | R290 | Well-insulated homes, underfloor heating | £4,349 to £5,797 |
| Vitocal 150-A Compact | Integrated heat pump and hot water cylinder | 4–16 kW | R290 | New builds, limited indoor space | £6,120 to £6,811 |
| Vitocal 151-A | High-efficiency split, quieter operation | 4–16 kW | R290 | Premium installs, noise-sensitive locations | £5,500 to £8,000 (approx.) |
| Vitocal 200-A | Heating and optional cooling, split | 4.2–11.8 kW | R32/R410A | Homes wanting heating and cooling in one | £5,780 to £9,990 |
| Vitocal 222-A | Integrated with DHW cylinder | 4.2–14.3 kW | R32 | Homes with limited plant room space | £7,645 to £11,690 |
| Vitocal 350-A | Commercial/large residential | 10–20 kW | R410A | Large period homes, light commercial | £13,170 to £16,945 |
The most popular model for UK residential installs in 2026 is the Vitocal 150-A, which uses R290 refrigerant (also known as propane), one of the most environmentally responsible refrigerant options currently available. Its global warming potential of just 3, compared to over 2,000 for older refrigerants, makes it a genuinely future-proofed choice.
The Vitocal 150-A Compact is a particularly practical option for Kent homeowners who are working within space constraints. It combines the outdoor heat pump unit with an integrated indoor hot water cylinder, removing the need for a separate cylinder and freeing up space in your utility room or airing cupboard.
When comparing ranges, the Samsung heat pump EHS TDM series offers a similarly broad lineup, though Viessmann’s R290 models and the OVO partnership give Viessmann a distinct edge on both environmental credentials and running cost management.
How Much Do Viessmann Heat Pumps Cost?
Viessmann heat pump costs in the UK run from approximately £10,000 to £18,000 fully installed, depending on the model, output size and the complexity of the installation at your property. After the government’s Boiler Upgrade Scheme grant of £7,500, the net cost to eligible homeowners in England and Wales drops to between roughly £2,500 and £10,500.
Viessmann Heat Pump Pricing Table
| Model | Unit Cost (approx.) | Installation | Total Before Grant | Total After £7,500 Grant |
| Vitocal 100-A 8kW | ~£2,538 | £2,500–£4,000 | ~£7,000–£9,000 | ~£0–£1,500 |
| Vitocal 100-A 14kW | ~£3,658 | £3,000–£4,500 | ~£9,000–£11,000 | ~£1,500–£3,500 |
| Vitocal 150-A 8kW | ~£5,061 | £3,000–£4,500 | ~£10,500–£12,500 | ~£3,000–£5,000 |
| Vitocal 150-A 13kW | ~£5,797 | £3,500–£5,000 | ~£11,500–£13,500 | ~£4,000–£6,000 |
| Vitocal 150-A Compact 8kW | ~£6,225 | £3,000–£4,500 | ~£11,500–£13,500 | ~£4,000–£6,000 |
| Vitocal 222-A 8kW | ~£8,000 | £3,500–£5,000 | ~£13,500–£15,000 | ~£6,000–£7,500 |
| Vitocal 350-A 10kW | ~£13,170 | £4,000–£5,500 | ~£17,000–£19,000 | ~£9,500–£11,500 |
All prices are approximate, include VAT at 0% (heat pump installations are VAT exempt) and may vary depending on your specific property requirements and location within Kent.
The Boiler Upgrade Scheme grant is available to homeowners in England and Wales and is applied directly to your installer’s quote, meaning you never see or handle the grant money yourself. Guscott Heating handles the grant application process on your behalf for every installation we carry out across Kent.
It is worth noting that while Viessmann sits at a higher price point than brands like the Cosy 6 heat pump (Octopus Energy’s budget-friendly offering) or the Midea heat pump, the quality of build, real-world efficiency record and the OVO running cost partnership often make the higher initial investment worthwhile over a 10 to 15-year system lifespan.
How Much Does It Cost to Run a Viessmann Heat Pump?
Running a Viessmann heat pump costs around £840 to £1,200 per year for a typical UK household, based on 2026 Ofgem price cap electricity rates of 24.5p per kWh. For Kent homeowners switching from a gas boiler, annual savings can range from £124 per year on a standard tariff up to £387 per year on a smart time-of-use tariff, based on Energy Saving Trust figures.
Reducing Your Running Costs Further
One of the standout advantages of owning a Viessmann Vitocal 150-A or 151-A is access to the OVO Heat Pump Plus tariff, which charges electricity consumed by the heat pump at a flat rate of 15p per kWh. Based on Viessmann’s own calculations, this can deliver savings of up to £350 per year compared to paying a standard variable tariff.
To access this, you connect your heat pump to the ViCare app, switch to OVO Energy and install a smart meter, a straightforward process that most Viessmann installers can help you set up.
For a Kent homeowner who also has solar panels installed, the picture becomes even more compelling. Running your heat pump during the hours when your solar panels are generating free electricity, combined with a smart tariff for overnight operation, can bring annual heating costs down by 50% or more compared to a standard electricity tariff.
The LG Therma V and Hitachi Yutaki heat pumps are competitive on running costs at standard tariffs, but neither currently offers an equivalent bundled energy tariff partnership of the kind Viessmann has established with OVO, giving Viessmann a distinct practical advantage for cost-conscious homeowners.
What Warranty Do Viessmann Heat Pumps Come With?
Viessmann’s warranty varies by model, but the headline news for 2024 and beyond is that the Vitocal 150-A and 151-A now come with an extendable warranty of up to 10 years, which is among the most generous in the residential heat pump market.
Warranty Options by Model
| Model | Standard Warranty | Extension Option | Extension Cost |
| Vitocal 100-A | 2 years | None available | N/A |
| Vitocal 150-A | 2 years | Up to 7 years (or 10 years) | 7-year: £360 |
| Vitocal 151-A | 2 years | Up to 10 years | Contact Viessmann for pricing |
| Vitocal 200-A / 222-A / 350-A | 2 years | Varies | Contact Viessmann for pricing |
There are a few things to keep in mind. To unlock the extended warranty, your installation must be registered with Viessmann within 30 days of completion, and it must be carried out by a Viessmann Trained Installer.
This is not a complex requirement, but it underlines the importance of choosing a reputable installer who will complete the registration process for you.
For comparison, the Worcester Bosch heat pump range comes with a 7-year warranty as standard, and the Aira heat pump advertises 10 years on its products. On that basis, the Vitocal 100-A’s 2-year base warranty with no extension looks short. However, for the Vitocal 150-A and 151-A, Viessmann’s up-to-10-year extended warranty is genuinely competitive with the best in the market.
Which Property Types Are Best Suited for a Viessmann Heat Pump?
Viessmann heat pumps are best suited to a wide range of UK property types, thanks to the breadth of the Vitocal range, but the right model for your home depends on your insulation levels, heating distribution system and hot water requirements.
Matching the Right Model to Your Property
Vitocal 100-A is best suited for:
- Smaller, well-insulated modern homes with good EPC ratings
- Homeowners on a tighter budget who still want a reliable brand
- Properties with underfloor heating already installed
- Buy-to-let properties in Kent where keeping upfront costs manageable matters
Vitocal 150-A Standard is best suited for:
- Mid-sized detached and semi-detached homes across Kent
- Properties where the owner wants the longest available warranty
- Homeowners who want the OVO Heat Pump Plus tariff for lower running costs
- Any property where the installer has confirmed the insulation level supports low-temperature heating (35°C to 45°C flow)
Vitocal 150-A Compact is best suited for:
- New builds or full renovations where the heating system is being designed from scratch
- Homes with limited indoor plant room or utility space
- Homeowners who want an all-in-one heating and hot water solution in a smaller footprint
Vitocal 200-A or 222-A is best suited for:
- Larger homes in areas such as Tunbridge Wells, Sevenoaks or the Weald with higher heat demand
- Homeowners who want both heating and cooling from one system
- Properties in Kent’s rural areas where temperatures can dip lower in winter
Vitocal 350-A is best suited for:
- Larger period properties in places like Canterbury or Whitstable
- Light commercial properties or converted buildings
- Any property with a heat demand above what standard domestic models can meet
A Note on Insulation
Whatever Viessmann model you are considering, the condition of your property’s insulation will have a significant bearing on how efficiently the system runs and how low your bills will be. A pre-installation heat loss survey is an essential part of any responsible installation. Guscott Heating carries out thorough surveys for every home we work in across Kent, ensuring the system we recommend is properly sized for your property.
What Are Viessmann’s Customer Ratings?
Viessmann’s customer ratings across independent review platforms are among the strongest in the air source heat pump industry, reflecting a broad pattern of positive customer experiences across the UK.
Trustpilot
Viessmann has accumulated over 5,000 reviews on Trustpilot, with an average rating of 4.4 out of 5 stars. Notably, 75% of all reviewers award the full 5 stars, which is a remarkably high proportion and indicates that the majority of customers are genuinely satisfied rather than just moderately happy. Positive reviews most frequently highlight efficiency, the quality of the ViCare smart controls and the helpfulness of the support team. A small number of negative reviews mention delays in warranty registration and occasional difficulties reaching the support line, which reinforces why choosing a proactive, experienced installer matters.
For context, the Nibe heat pump brand tends to receive mixed reviews on Trustpilot compared to Viessmann’s consistently strong scores, and the Midea heat pump has a shorter UK customer review history given its more recent entry into the British market.
Which?
Viessmann’s Vitocal range is assessed by Which? as part of their broader heat pump brand reviews. Which? assessments cover real-world reliability, ease of installation, running cost accuracy and how well the manufacturer supports customers post-installation.
We recommend checking the current Which? heat pump reviews directly for the most up-to-date independent assessment, as ratings are reviewed regularly and reflect new customer data as it comes in.
Is a Viessmann Heat Pump Right for You?
A Viessmann heat pump review like this one can give you the information you need, but ultimately the decision comes down to your specific property, budget and priorities. Here is a straightforward buying guide to help you decide.
Choose a Viessmann Heat Pump If…
- You want a brand with over 100 years of heating experience and consistently strong independent customer ratings
- Your home is reasonably well insulated, ideally EPC C or above, or you are planning insulation improvements alongside the installation
- You want access to the OVO Heat Pump Plus partnership and the potential to save up to £350 per year on running costs
- You have underfloor heating or are willing to upgrade your radiators to larger low-temperature versions
- You want the option of a warranty of up to 10 years on your system, one of the best available in the UK market
- You are a landlord in Kent looking to improve your rental property’s EPC rating to meet current or forthcoming minimum energy efficiency standards
- You want smart home integration through the ViCare app to monitor and control your heating from your phone
- You are eligible for the £7,500 Boiler Upgrade Scheme grant and want to apply it to a premium, future-proofed system
- You are building a new home or undertaking a full renovation and want to design the heating system correctly from the ground up
Do Not Choose a Viessmann Heat Pump If…
- Your budget is very tight and even the post-grant cost of a Vitocal 150-A is a stretch, in which case the Cosy 6 heat pump from Octopus Energy or the Midea heat pump may offer a more accessible entry point
- Your property is listed or in a conservation area where the outdoor unit placement options are very limited, as the larger Vitocal units have specific siting requirements
- You want the absolute longest standard warranty without any registration steps or additional cost, in which case the Worcester Bosch heat pump (7-year standard) or Aira heat pump (10-year standard) may suit you better
- Your property has very poor insulation and you are not in a position to upgrade before or alongside the heat pump installation, as the system will not achieve the efficiency figures that justify the investment
- You need a heat pump only for a small flat or apartment, where the output range and physical size of Viessmann’s residential units may be excessive for the property’s actual heat demand
Get a Free Heat Pump Quote in Kent
Guscott Heating installs air source heat pumps across Kent, covering Maidstone, Canterbury, Tunbridge Wells, Folkestone, Sevenoaks, Ashford, Sittingbourne, Medway, Faversham, Dover, Deal, Tonbridge, Whitstable and the surrounding areas.
Request your free air source heat pump installation quote today.
Our team will visit your home, carry out a full heat loss survey, confirm your eligibility for the £7,500 Boiler Upgrade Scheme grant and provide a detailed, no-obligation installation quote tailored specifically to your property. We manage the entire grant application process on your behalf, and we will make sure your warranty is registered correctly from the moment your system goes live.
The BUS grant is confirmed until 2030, but installation slots are limited, particularly during the spring and autumn, when demand is highest. Getting your survey booked now means you will not be caught waiting when you are ready to move forward.
Frequently Asked Questions
Can a Viessmann heat pump work alongside solar panels?
Yes, and the combination is one of the most cost-effective setups available for UK homeowners. When your solar panels generate electricity during daylight hours, your Viessmann heat pump can be programmed to run during those periods, effectively heating your home and hot water for free. Combined with a smart time-of-use tariff for overnight operation, Energy Saving Trust data suggests you could cut annual heating costs by 50% or more compared to a standard electricity tariff.
Does a Viessmann heat pump work as an air conditioning unit in summer?
Some models in the Vitocal range do offer a cooling function as well as heating. The Vitocal 200-A is specifically designed to deliver both heating and cooling from the same unit. This means during a warm Kent summer, the same system that heats your home in winter can provide a cooling effect by reversing the heat exchange cycle. Not all Vitocal models include this feature, so it is worth confirming with your installer if year-round climate control is a priority for you.
How long does a Viessmann heat pump last?
A well-installed and regularly serviced Viessmann heat pump should last between 15 and 20 years. The compressor, which is the heart of the system, is the component most likely to determine the overall lifespan. Viessmann’s extended warranty of up to 10 years on the Vitocal 150-A and 151-A gives you substantial protection during the most critical years of the system’s life. Annual servicing by a qualified engineer is the single most effective thing you can do to maximise the lifespan of your heat pump.
Will a Viessmann heat pump affect my home’s EPC rating?
Yes, replacing a gas boiler with an air source heat pump almost always improves your property’s Energy Performance Certificate rating. The improvement can be one to two full bands in many cases, moving a property from a D to a C or from a C to a B. This is increasingly important for landlords in Kent, as Minimum Energy Efficiency Standards are expected to tighten, and having a higher EPC rating protects both your lettability and the long-term value of your investment.
Is the Viessmann ViCare app included as standard?
Yes, the ViCare app is included as standard with all new Viessmann Vitocal heat pump installations. It allows you to monitor your system’s energy consumption, adjust heating schedules, check live efficiency data and receive alerts if anything needs attention, all from your smartphone. For homeowners who are serious about understanding and managing their energy use, the ViCare app is a genuinely useful tool rather than just a marketing add-on.
