Viessmann Vitocal heat pumps

Viessmann is a German heating manufacturer that has operated in the UK since 1989 and built its first heat pump in 1981¹. Its domestic range sold here is the Vitocal family: air-to-water units such as the compact 150-A and the newly launched 200-A ie, plus ground source models including the 200-G and the high-temperature 350-G². The range covers heating, cooling and hot water, and Viessmann states the units can be combined with solar thermal and photovoltaic systems².

For a household weighing energy independence, a Vitocal heat pump removes the gas or oil supplier from the heating bill but replaces it with a dependence on grid electricity, a manufacturer's warranty terms and, for the longest guarantees, a registered installer. This page sets out what the range does, what it costs, what it needs from your home and where its limits sit.

Overview of the Vitocal line: 150-A, 200-A ie and other models

The Vitocal range splits into air source and ground source families. On the air side, the 150-A is a compact air source unit with an integral instantaneous heating-water heater, documented in a UK installation at 13kW⁴. Above it sits the 200-A ie, launched at InstallerSHOW at the NEC Birmingham on 23 June 2026 with a new, improved range of four indoor units matching the existing 150-A line-up¹. For larger demands, the Vitocal 350-A carries an integral cascade function through the Vitotronic 200 control unit, allowing up to five air source heat pumps to operate together with heating output levels of up to 92.5 kW³.

On the ground source side, the 200-G offers flow temperatures up to 60°C and a cooling function, while the 350-G is a high-temperature model reaching up to 68°C, aimed at larger existing buildings with radiator systems². All of Viessmann's ground source heat pumps can be used in both open and closed circuits⁵. The range also includes cylinders, with a 25 year cylinder warranty and 2 years on parts².

Vitocal 200-A ie: the latest air-to-water heat pump for British households

The Vitocal 200-A ie, where ie stands for intelligent energy, is an air-to-water heat pump launched to the UK market at InstallerSHOW on 23 June 2026, with availability from this autumn¹. It arrives with a new, improved range of four indoor units, matching the indoor line-up already used with the Vitocal 150-A¹.

The headline capability for larger homes is scalability. Viessmann states that up to four heat pumps can be cascaded to provide a maximum 48 kW output installation, requiring only one indoor unit and one wall breakthrough¹. That matters in practice because the wall breakthrough is the hole pipework passes through into the home: one penetration instead of several reduces both installation work and the points where the building fabric is pierced.

Viessmann positions the 200-A ie as a gateway to the fully electrified home, a framing worth reading plainly. A heat pump of this kind moves a household's heating onto electricity, and Viessmann notes the wider context of homes moving away from gas¹. What it does not do is make the home independent of the electricity grid: the unit runs on mains power, and its smart features depend on connectivity. The 200-A ie is also too new to have independent performance data behind it, so the documented figures in this page come from the 150-A and the ground source range until real-world results appear.

Vitocal 150-A: a space-saving air source heat pump

The 150-A is the established compact model, and the best-documented UK example is a Dorset installation combining a 13kW Vitocal 150-A air source heat pump with an integral instantaneous heating-water heater and solar panels⁴. In that home the design flow temperature of the heat pump system was 55°C, and with a maximum flow temperature of 70°C it worked with almost all of the household's existing radiators⁴.

On price, there is no single Viessmann list price for a supplied and installed system. Distributor product listings for the Vitocal 150-A open at £5,445.70 and at £5,588.31, figures that differ between listings, and these are equipment prices rather than installed costs. For installed costs, the independent figures for air source heat pumps generally are: £8,000 to £12,000 to install⁶; £6,500 to £11,500 including VAT, labour and the Boiler Upgrade Scheme grant, per government guidance⁸; and £10,870 to £15,422 for air source installations under the Boiler Upgrade Scheme in 2023⁹. Broader heat pump figures run higher still: £14,000 to £28,000 in Great Britain depending on type¹⁰, estimated total costs of £6,800 to £17,700 with an average of £13,000¹¹, around £11,700 on average¹², about £10,500 with a range of £8,000 to £15,000¹³, and £15,000 to £30,000 in one boiler-types guide¹⁴. The spread is wide because these figures mix system types, property sizes and grant treatment; the number that matters is the quote for your own home.

The Boiler Upgrade Scheme grant is applied for by your installer on your behalf through Ofgem, and quotes can be gathered through the MCS find a heat pump installer tool or via your energy supplier¹⁵.

Radiators and flow temperatures: your home's suitability for Vitocal

Flow temperature is the number that decides whether a Vitocal works with your radiators. Viessmann's own material states that a heating system with radiators requires temperatures of up to 70°C, while underfloor heating systems manage with around 30°C³. The documented 150-A installation ran a design flow temperature of 55°C with 70°C available at maximum⁴, and the 350-G high temperature model provides up to 70°C for larger existing buildings with radiator systems².

Independent guidance frames the efficient operating band more tightly. A maximum flow temperature of 55°C is typically recommended¹⁶; heat pumps run at considerably lower temperatures than traditional boilers, at around 50°C with 55°C as a maximum¹⁷; and the SAP default flow temperature for heat pumps with a wet heat distribution system is 58°C¹⁸. Northern Ireland's official guidance puts air source units at around 45°C¹⁹, and for hot water generation, flow temperatures should ideally be 55°C or greater²⁰. High temperature heat pumps, the category the 350-G falls into, are designed to run at 65 to 80 degrees²¹.

On radiators themselves, the evidence is reassuring. Heat pumps can work with radiators or underfloor heating²², and air-to-water units work well in combination with large radiators and underfloor pipes²³. The Dorset 150-A case study is the direct Viessmann evidence: at up to 70°C, it worked with almost all of that household's existing radiators⁴. The trade-off is running cost: the lower the flow temperature, the more efficient the unit, so a system designed around 50 to 55°C will cost less to run than one pushed to 70°C. More detail is in what flow temperature do heat pumps use for space heating? and do I need to upgrade my radiators for a heat pump?.

Using heat pumps in period properties and multi-mode setups

Viessmann states its heat pumps can be used in new build and modernisation projects, including multi-mode operation with existing oil or gas heating systems³. That is the hybrid arrangement: the heat pump does the everyday heating and the boiler backs it up in cold weather or for hot water peaks. Independent guidance on hybrid systems confirms the fuel options, noting that oil and LPG boilers can also be used²⁴, and that in many cases a gas, oil, LPG, electric or biomass boiler can be swapped out and replaced with a heat pump altogether²⁵.

For older homes, the choice between these routes is the real decision. A full swap removes the boiler and its fuel supply entirely, which is the stronger independence position, but it depends on the fabric and emitters supporting lower flow temperatures. Multi-mode operation keeps the existing boiler, which lowers the risk if the house struggles at 55°C, but it keeps the home tied to gas or oil and to two heating appliances to maintain. The 350-G, with flow temperatures up to 68°C and up to 70°C for radiator systems, is Viessmann's answer for larger existing buildings where radiator upgrades are not practical². The wider question of heat pumps in Victorian houses and hybrid heat pump and boiler systems is covered in full elsewhere on the site.

Compatible extras: cooling, solar thermal and photovoltaics with Vitocal

The Vitocal range is not only for heating: Viessmann states the range can be used for cooling and to supply a building's hot water as well as heating². On the ground source side, the 200-G lists a cooling function among its features⁵.

The pairing that matters most for independence is photovoltaics. Viessmann states that Vitocal heat pumps can be combined with a photovoltaic system, with the self-generated electricity used to power the heat pump², and the 200-G is described as already prepared for the utilisation of more affordable power generated on site by a PV system³. The Dorset 150-A reference installation is exactly this combination: a 13kW air source heat pump working alongside solar panels⁴. This is the one route by which a Vitocal household reduces its grid dependence, since the heat pump's largest running cost is electricity and PV offsets it directly. Viessmann also cites multi-mode operation with solar thermal systems³, and the Vitoconnect gateway is compatible not only with new Viessmann heating systems but with many existing appliances, connecting via cable with a plug-in power supply unit included³. The limits of that pairing are covered in solar panels and a battery with a heat pump.

Guarantees, maintenance and help for installers

Viessmann's published warranty position is short: all its heat pumps come with a standard warranty of two years, which can be extended if the unit is installed by a registered Viessmann installer⁵. Vitocal cylinders carry a 25 year cylinder warranty with 2 years on parts². Independent guidance puts the market norm at two to three years for most systems²⁶, and notes that warranties can often be extended for a fee²⁷. The extension route, through a registered installer, is the condition worth checking before signing anything: the standard term is the shortest in the market's typical range.

Servicing follows the manufacturer's advice, usually once a year, at a typical cost of around £150²⁸. Booking runs through the installer or Viessmann's service arrangements; the grant route, where relevant, runs through your installer via Ofgem¹⁵. Viessmann Climate Solutions UK has also adopted remote visual assistance to support customers and installers, which can shorten diagnosis, though it depends on the household having a working connection. The servicing detail is expanded in heat pump servicing and maintenance and whether servicing affects the warranty.

Viessmann as a brand: its story, standing and footprint in Britain

Viessmann introduced its first heat pump in 1981, giving it over 45 years of heat pump engineering, and the company has operated in the UK since 1989¹. That longevity is the maker's own framing, but the independent record on the brand exists too. In Which? product research, Viessmann gets a three-star rating for its customer score, with 80% of owners reporting satisfaction with their boiler, slightly below the average satisfaction rate of 82%, while 81% of Viessmann customers said they were likely to recommend the brand to someone else⁷. These figures relate to Viessmann boilers rather than heat pumps, so they are an indicator of the company's customer handling rather than a direct measure of Vitocal ownership.

Viessmann has also shown itself willing to answer consumer-body enquiries, having responded to Which? questions about boiler breakdowns⁷. For a household, the relevant points are these: the company is long-established, it has a UK operation approaching four decades, and its satisfaction figures are average rather than exceptional. A comparison with other makers is at Vaillant heat pumps, Worcester Bosch heat pumps and Baxi heat pumps.

Shortcomings of the Vitocal range

The limits are worth stating as plainly as the benefits. A Vitocal heat pump runs on grid electricity, so it replaces a dependence on a gas or oil supplier with a dependence on an electricity supplier; the running costs are those of electricity, estimated at £800 to £1,050 a year as one of the cheapest electric heating options in one analysis²⁹, and £2,100 to £2,500 a year for a three-bed semi-detached house in official statistics³⁰. Those two figures differ because they measure different things in different periods, and both should be read as ranges rather than promises.

The warranty is the shortest end of the market norm at two years standard, extendable only through a registered installer⁵. The 200-A ie is new enough that no independent performance data exists for it yet. The smart and remote features depend on connectivity and the manufacturer's platform through the Vitoconnect gateway³. And the multi-mode option, while useful in an old house, keeps a boiler and its fuel supply in the home. What a Vitocal does deliver is heating without gas or oil, the option of cooling, and a documented route to pairing with solar PV so that some of the power it consumes is generated on site². The full picture of heat pumps and household energy independence sets out the trade in depth.