Viessmann's Vitocal range page lists the 150-A, 150-A Compact, 150-A Hybrid, 200-A and 222-A among its air source heat pumps and the 200-G and 222-G among its ground source units, and City Plumbing lists the Vitocal 150-A 8kW at £6,675.60 including VAT and the Vitocal 151-A 4kW at £8,043.60. The standard warranty is 2 years on most of that range and 5 years on the 200-A ie, and the longer cover is a paid extension your installer has to register. So the two things to pin down on a Viessmann quote are which Vitocal is on it and who is registering the warranty.
Standard cover is 2 years, and 7 years is a £360 extension
Viessmann's own warranty table gives the Vitocal 150-A, 150-A Compact, 150-A Hybrid, 200-A, 222-A, 200-G and 222-G a 2 year standard warranty, with a 7 year Extension 1 priced at £360. The Vitocal 200-A ie is the exception at 5 years standard and 10 years as an extension priced at £312, and the Vitocal 100-A has no extension option at all.
| Vitocal model | Standard | Extension 1 | Price of Extension 1 |
|---|---|---|---|
| Vitocal 100-A | 2 years | N/A | N/A |
| Vitocal 150-A | 2 years | 7 years | £360 |
| Vitocal Compact/Hybrid | 2 years | 7 years | £360 |
| Vitocal 200-A ie | 5 years | 10 years | £312 |
| Vitocal 200-A | 2 years | 7 years | £360 |
| Vitocal 200-G (ground source) | 2 years | 7 years | £360 |
| Vitocal 222-G (ground source) | 2 years | 7 years | £360 |
Viessmann says that for an extended guarantee, which is offered on some models as a purchase option, your installer must register your installation on the Viessmann VPlus Platform for installations in Great Britain. The same page's 30 day registration deadline is written about boilers rather than heat pumps, so ask your installer to confirm in writing when your unit will be registered and to send you the confirmation.
Every brand words this differently, so compare the conditions rather than the headline number. Our pages on Vaillant heat pumps, Midea heat pumps and Ideal heat pumps set out what each of those three asks of the installer. Put the same question to every firm on your shortlist: how many years am I covered for on the day you leave, and what does longer cost?
The Vitocal 200-A ie: 75 °C flow, A+++, and the longest standard cover
Viessmann lists the Vitocal 200-A ie with outputs ranging from 6 to 12 kW, energy efficiency class A+++, the natural refrigerant R290 (propane) with a GWP of 0.02, and 5 years standard warranty via the VPlus platform, with a 10 year warranty available with a premium service plan. If a Vitocal is going on an older house with its original radiators, this is the unit to ask about.
Viessmann says the 200-A ie is ideal for modernising existing properties, as it delivers a flow temperature of up to 75 °C, and that existing radiators or underfloor heating can continue to be used, eliminating the need for extensive renovation work. On the spec sheet the maximum flow temperature is 75 °C for unit sizes 06, 08, 10 and 12, falling to 70 °C at an outside temperature of A minus 10.
- Sound power, ErP conditions. Viessmann publishes 48 dB(A) for unit size 06, 53 dB(A) for size 08, 54 dB(A) for size 10 and 55 dB(A) for size 12, measured under ErP Point C at operating conditions A7/W55.
- Sound power, maximum. 56 dB(A) for size 06, 59 dB(A) for size 08 and 61 dB(A) for sizes 10 and 12 under the same measurement conditions.
- Sound power, quiet operation Level 2. 54 dB(A) for size 06 and 56 dB(A) for sizes 08, 10 and 12.
Those are three figures for the same box. Size 10 is published at 54 dB(A) under the ErP test, 61 dB(A) at maximum and 56 dB(A) in quiet mode. Ask which setting your system is designed to run at on a cold January evening, because that is the one you will hear.
What a Viessmann heat pump costs, and what the job costs
City Plumbing lists the Viessmann Vitocal 150-A 8kW, supplier part number Z026438, at £6,675.60 including VAT, and the Viessmann Vitocal 151-A 4kW, part number Z026961, at £8,043.60 including VAT. Check which of the two is on your quote, and whether a cylinder is priced separately alongside it.
Set those against the whole job rather than the unit. The Energy Saving Trust puts the typical cost of installing an air source heat pump at around £12,000, and says the cost varies with the size of heat pump, the size of your property, whether it is a newbuild or an existing property, and whether you need to upgrade your radiators. Our guide to heat pump costs in the UK breaks that figure into its parts.
Hot water is a line of its own. The Energy Saving Trust says plainly that a standard air source heat pump does not provide hot water on demand like a combi boiler, so you need a way of storing hot water for when you need it. Viessmann's answer on the 151-A is an integral DHW cylinder with 190 litre capacity. Ask whether a cylinder is priced as a separate line if you are quoted a 150-A.
VAT belongs in the sum too. HMRC says a zero rate applies to the installation of certain specified energy-saving materials from 1 May 2023 to 31 March 2027, and that from 1 April 2027 onwards these will revert to the reduced rate of VAT of 5%. Only air source heat pumps that are permanently fixed and are not portable or moveable qualify. Compare installed prices rather than trade counter prices.
Get the Viessmann quote itemised
Tell us about your home once and we will pass your details to MCS-certified installers covering your postcode. Ask each of them to name the Vitocal model, the cylinder, the design flow temperature and the warranty term as separate lines. The form takes about a minute.
Flow temperature by model: 70 °C on the 150-A, 60 °C on the ground source
Viessmann gives the Vitocal 150-A and 151-A a rated heating output of 2.1 to 14.9 kW and a maximum flow temperature of 70 °C at an outside temperature of down to minus 10 °C, while the ground source Vitocal 200-G achieves a maximum flow temperature of 60 °C. If your home is keeping its radiators, the maximum flow temperature of the unit being quoted is the first thing to ask about.
- Vitocal 150-A. Viessmann cites the natural refrigerant R290 (propane), with a GWP100 of 0.02. Viessmann describes it as highly suitable for modernisation and says that, subject to proper system design and a weather-compensated heating system, it may be possible to retain existing radiators.
- Vitocal 151-A. The same 2.1 to 14.9 kW output and 70 °C maximum flow temperature, with an integral DHW cylinder with 190 litre capacity.
- Vitocal 200-G. Rated heating output 5.8 to 22.6 kW, which Viessmann splits into 5.8 to 17.4 kW for ground source operation and 7.5 to 22.6 kW for water to water operation, with brine to water COP figures at EN 14511 B0/W35 of 4.60, 4.64, 4.81, 4.93 and 4.51 across the output variants, and a SCOP of up to 5.3 under EN 14825 for average climate and low-temperature application at W35. Viessmann says the natural cooling function is included but that the optional natural cooling box is required for it.
The phrase to hold your installer to is "subject to proper system design". A high brochure flow temperature is permission to keep your radiators, not proof that yours will cope, and the proof is the room by room heat loss calculation. Our guide to radiators and heat pumps covers what changing them involves and what it costs when it cannot be avoided, and heat pumps against gas boilers runs the same decision on running costs.
Check the grant figure on gov.uk, not in the brochure
Viessmann's homeowner FAQ on MCS accreditation says the onus is on the installer to provide a £5000 discount as part of their quotation and then claim the funding back from Ofgem, but gov.uk gives £7,500 towards an air source heat pump. Use the gov.uk figure when you check what an installer has taken off your quote.
Gov.uk sets out £7,500 towards an air source heat pump and £7,500 towards a ground source heat pump, including water source heat pumps and those on shared ground loops, with one grant per property. Until March 2027 there is an additional £1,500 if the property is heated by oil or LPG and has no mains gas connection. An air-to-air heat pump gets £2,500.
The same Viessmann page says there is currently 0% VAT on heat pump, solar and micro CHP installations for the next five years, where HMRC's own notice puts the zero rate's end at 31 March 2027. Neither error says anything about whether a Vitocal is a good unit. They do mean you should take the money and the dates from the government page, and leave the manufacturer page for the kit.
The conditions that catch people out are these:
- Gov.uk states you must own the property and be replacing fossil fuel heating systems, which it lists as oil, gas, electric or LPG.
- Your installer must commission and install the heat pump within 120 days of applying for the grant, or the installation will not be eligible.
- Most new build properties and social housing cannot get a grant, and nor can a property that has already been given government funding or support for a heat pump or biomass boiler.
- You cannot get a grant for a hybrid heat pump system, for example a combination of gas boiler and air source heat pump. Viessmann's range page lists the Vitocal 150-A Hybrid, a hybrid heat pump with a nominal heat output of 2.1 to 14.9 kW, so if that unit is on your quote, ask which configuration is being ordered and whether a grant is being claimed on it.
Gov.uk says the scheme is open to people in England and Wales, and that people in Scotland may instead be able to get an interest-free loan or grant through Home Energy Scotland. The Energy Saving Trust says that in Northern Ireland there is not a specific grant currently available, though you can still get heat pump ready and apply for funding for insulation. On applying, gov.uk says you contact MCS certified installers for quotes, agree a quote, and your installer applies on your behalf on the Ofgem website, with the value of the grant taken off the amount you pay.
The noise figures, and the one planning actually uses
Viessmann's dB(A) figures are sound power at rated heat output, measured under ErP Point C as specified in DIN EN 14825 at operating conditions A7/W55. England's permitted development right turns on the MCS 020 a) sound calculation instead.
Article 6 of the Town and Country Planning (General Permitted Development) (England) (Amendment) Order 2025 amended the definition of "MCS Planning Standards" in paragraph P of Part 14, substituting "MCS 020 a) - Air Source Heat Pump Sound Calculation (For Permitted Development Installations)" for the earlier reference to MCS 007. That Order is an England instrument amending the England Order, so check the rules for the nation your own home is in.
Ask for the MCS 020 a) calculation in writing for the exact unit and the exact position against your wall, especially near a boundary or a neighbour's window. The Energy Saving Trust notes that most heat pump installations are considered permitted developments, but that there are exceptions and it is best to check with your local planning department, which matters most in a listed building or a conservation area.
You buy a Viessmann through a Viessmann-trained installer
Viessmann says all installers listed in its directory are trained at the Viessmann Academy and are familiar with its products, and its route for homeowners is to find a contractor near you and get a quote from a local installer. The firm in your driveway is therefore the decision you are making, and it is the one that registers your warranty and claims your grant.
Access to Viessmann's MCS umbrella scheme is for Viessmann-trained installers only, and Viessmann's own FAQ states that government funding such as the Boiler Upgrade Scheme, and Building Control approval, can only be unlocked if the installer is on the certified MCS installer database. The Energy Saving Trust recommends getting quotes from certified installers accredited through the Microgeneration Certification Scheme, and recommends getting quotes from at least three different installers.
On the company itself, Viessmann says it was founded in 1917 as a heating technology manufacturer and is now part of Carrier. A warranty is only as good as the company standing behind it in year six, so get the registration confirmation rather than the sales line. For a brand comparison on the same checks, our pages on Mitsubishi Ecodan and Daikin heat pumps are the closest equivalents. HMRC's list of qualifying energy-saving materials includes solar panels as well as air source heat pumps, so if you are pricing both in the same year, our guide to solar panel costs in the UK covers the solar side.
Frequently asked questions
City Plumbing lists the Viessmann Vitocal 150-A 8kW, supplier part number Z026438, at £6,675.60 including VAT, and the Viessmann Vitocal 151-A 4kW, part number Z026961, at £8,043.60 including VAT. The 151-A includes an integral DHW cylinder with 190 litre capacity. Those are unit prices rather than installed prices: the Energy Saving Trust puts the typical cost of installing an air source heat pump at around £12,000, before the £7,500 Boiler Upgrade Scheme grant in England and Wales, and says the cost varies with the size of heat pump, the size of your property, whether it is a newbuild or an existing property, and whether you need to upgrade your radiators.
Viessmann's warranty table gives the Vitocal 150-A, 150-A Compact, 150-A Hybrid, 200-A, 222-A, 200-G and 222-G a 2 year standard warranty with a 7 year Extension 1 priced at £360. The Vitocal 200-A ie has 5 years standard and a 10 year extension priced at £312, and the Vitocal 100-A has no extension option. For an extended guarantee, Viessmann says your installer must register your installation on the Viessmann VPlus Platform for installations in Great Britain. Ask your installer in writing when the registration will be done.
Viessmann quotes the Vitocal 200-A ie at a flow temperature of up to 75 °C. It says the unit is ideal for modernising existing properties as it delivers a flow temperature of up to 75 °C, and that existing radiators or underfloor heating can continue to be used, eliminating the need for extensive renovation work. The Vitocal 150-A and 151-A have a maximum flow temperature of 70 °C at an outside temperature of down to minus 10 °C, and Viessmann says that subject to proper system design and a weather-compensated heating system it may be possible to retain existing radiators. The ground source Vitocal 200-G achieves a maximum flow temperature of 60 °C. Ask for the room by room heat loss calculation before accepting any of it.
Gov.uk gives £7,500 towards an air source heat pump and £7,500 towards a ground source heat pump, with one grant per property, and until March 2027 an additional £1,500 if the property is heated by oil or LPG and has no mains gas connection. You must own the property and be replacing fossil fuel heating systems, which gov.uk lists as oil, gas, electric or LPG, and your installer must commission and install the heat pump within 120 days of applying. You cannot get a grant for a hybrid heat pump system, for example a combination of gas boiler and air source heat pump, which matters if the Vitocal 150-A Hybrid is on your quote. Note that Viessmann's own homeowner FAQ still says the installer provides a £5000 discount, so take the amount from gov.uk.
Viessmann publishes sound power at rated heat output under ErP conditions A7/W55 of 48 dB(A) for unit size 06, 53 dB(A) for size 08, 54 dB(A) for size 10 and 55 dB(A) for size 12. At maximum the same unit sizes are 56, 59, 61 and 61 dB(A), and in quiet operation Level 2 they are 54, 56, 56 and 56 dB(A). England's permitted development right uses a different figure: Article 6 of the Town and Country Planning (General Permitted Development) (England) (Amendment) Order 2025 substituted "MCS 020 a) - Air Source Heat Pump Sound Calculation (For Permitted Development Installations)" into the definition of MCS Planning Standards in paragraph P of Part 14. Ask your installer for that calculation for the unit and position being proposed.
No. Viessmann's route for homeowners is to find a contractor near you and get a quote from a local installer, and it says all installers listed in its directory are trained at the Viessmann Academy and are familiar with its products. Access to Viessmann's MCS umbrella scheme is for Viessmann-trained installers only, and Viessmann states that government funding such as the Boiler Upgrade Scheme, and Building Control approval, can only be unlocked if the installer is on the certified MCS installer database. The Energy Saving Trust recommends quotes from at least three different MCS accredited installers.