Vitovalor 300-P from Viessmann – generate power and heat simultaneously using a fuel cell heating appliance

Three reasons to choose a fuel cell heating appliance

  1. Generate heat and power today with the latest technology: put your money on futureproof heating using hydrogen and natural gas.
  2. Make yourself more independent of rising electricity prices by using the fuel cell to generate power.
  3. Heat more economically and save up to 30 percent energy costs through efficient heating with the fuel cell. This allows you to make long term savings whilst also protecting the climate through lower CO2 emissions!

Viessmann Vitovalor 300-P fuel cell

Vitovalor 300-P, the fuel cell from Viessmann, is the ideal energy centre for a modern detached or two-family house. The system combines heat and power generation on a very small footprint. Vitovalor 300-P offers considerably higher electrical efficiency than that available through current combined heat and power (CHP) solutions. This reduces the amount of heat extracted and makes the fuel cell heating appliance particularly suitable for use in new builds and renovations.

Vitovalor 300-P is the innovative alternative for decentralised power generation. Against the backdrop of discussions on energy and rising electricity prices, this solution is steadily gaining in relevance. In the future, CHP technology will be an important part of central power generation.

Fuel cell for detached and two-family houses

With 20 kW, Vitovalor 300-P offers sufficient thermal output to cover the entire heat demand of a detached or semi-detached homes – on a footprint of just 0.65 square metres. The maximum amount of electrical energy generated over the course of a day (16.5 kWh) is enough to cover the basic needs of an average household. The integral gas condensing boiler switches on automatically when the heat generated by the fuel cell module is insufficient, such as at peak times or when a lot of hot water is required for a brief period.

Proven and reliable: technology from Viessmann and Panasonic

As with all innovations from Viessmann, reliability and durability are the top priorities when it comes to the new fuel cell heating appliance as well. This is why a proven fuel cell module from Panasonic is used in the micro CHP unit. Viessmann has integrated this fuel cell, proven in more than 200,000 applications in Japan, into a perfectly matched heating system with gas condensing boiler, DHW cylinder and control unit.

Anticipates your needs: self-learning energy manager

The fuel cell heating appliances are heat led and power-optimised. The integrated energy manager is adaptive and responds to your individual requirements. This means that it only starts the natural gas/hydrogen driven heating appliance when it is worthwhile – when sufficiently long runtimes are expected and therefore corresponding power generation and on-site utilisation.

Additional power storage systems

The Vitocharge power storage system from Viessmann raises the on-site consumption rate in a household significantly. If the fuel cell heating appliance generates more power than is currently required, the surplus is generally exported to the grid. However, by combining Vitovalor 300-P with the Vitocharge power storage system, this power can be stored and used at a later time. This translates into a reduction of additional, expensive power drawn from the grid. For more information, go to Energy systems for Vitovalor 300-P.

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Fuel cells and hydrogen joint undertaking

“This project has received funding from the Fuel Cells and Hydrogen 2 Joint Undertaking under grant agreement No 700339. This joint undertaking receives support from the European Union’s Horizon 2020 research and innovation programme and Hydrogen Europe and N.ERGHY.”

Benefits of the Viessmann fuel cell heating appliance

  • Up to 30% lower energy bills compared with gas condensing technology 
  • Increasing independence of electricity prices by generating power on site
  • PACE funding – making the costs of purchase comparable to those of a gas condensing boiler or solar thermal system
  • Compact design with a small footprint
  • Efficient and environmentally responsible technology of the future
  • High operating convenience via tablet or smartphone
  • Energy efficiency class: A++
  • Energy efficiency class, DHW heating: A
Vitovalor 300-P fuel cell energy efficiency label

The investment in a new heating system that simultaneously generates both heat and power is worthwhile. Our video explains more about the benefits of the fuel cell heating appliance from Viessmann:

Fuel cell – generate power with your own heating system!

How Vitovalor 300-P works

Oxygen and hydrogen obtained from natural gas: these are the two components required to generate power and heat using the fuel cell heating appliance. The chemical reaction between these two elements is referred to as "cold combustion" and takes place between two electrodes. Hydrogen is conveyed to the anode. Here, it is split into negative electrons and positive hydrogen ions in the presence of a catalyst. The electrons travel to the cathode via an electrical conductor, which creates an electrical current. At the same time the positively charged ions reached the cathode through the electrolyte (an ion exchange membrane). They react with oxygen, releasing heat. The process is very clean and therefore good for the environment. For more information, go to How Vitovalor 300-P works.

Natural gas: perfect for fuel cells

The fuel cell uses hydrogen as its energy source. Hydrogen is the most abundant element in nature and is present in all organic compounds. Natural gas contains hydrogen as well as carbon. However, hydrogen does not exist in its pure form in nature. Natural gas is therefore used for the fuel cell. As the fossil fuel with the lowest emissions, it is highly suitable for obtaining pure hydrogen. Depending on requirements, Vitovalor 300-P can be operated with natural gas H or E. In the Vitovalor 300-P, the hydrogen is separated from the gas that has been added. First, the sulphur compounds are separated out. Next, an upstream reformer converts the gas into carbon dioxide and hydrogen in the presence of a catalyst. Carbon monoxide is converted to carbon dioxide in a subsequent gas cleaning process. 

Vitovalor 300-P fuel cell construction

Vitovalor 300-P fuel cell heating appliance consists of two units: a fuel cell module and a peak load module comprising an integral gas condensing boiler. This unit also contains a heating water buffer cylinder and DHW cylinder, as well as hydraulics, sensor technology and a control unit. The units are compact, visually matched and together require a footprint of less than 0.7 square metres.

Vitovalor 300-P fuel cell product cross-section


Electrical output
Fuel cell module: 750 Wel
Thermal output
Fuel cell module: 1 kW, peak load boiler: 1 to 25.2kWth
Electrical efficiency fuel cell module: 37%, overall efficiency fuel cell module: up to 90% (Hi), thermal efficiency of peak load boiler: up to 98% (Hs)
Energy efficiency class
Natural Gas
Application range
Detached or semi-detached homes, new build with low heat requirements
DHW heating
Integral DHW cylinder with loading system: 46 l
Heating water buffer cylinder
Integral 130 litre heating water buffer cylinder
Using a tablet or smartphone, you can access the latest data on heat and power generation and control the fuel cell boiler remotely. The standard integral remote monitoring system allows the heating contractor to keep a constant eye on the system.
Additional features
With an output of 1 kW the fuel cell module covers most of the heat demand. If more heat is required, the gas condensing boiler switches on automatically – for example, on particularly cold days or if a lot of hot water is used within a short period of time. At the same time, the Vitovalor 300‑P generates up to 16.5 kWh of power per day. That covers the baseline demand of most households.
Vitovalor 300‑P fuel cell heating appliance cross-section

Microgeneration Certification Scheme (MCS): Small installations

A ‘small installation’ is solar photovoltaic (solar PV) and wind installations with a Declared Net Capacity (DNC) of 50kW or less - you can find the DNC of your installation on your MCS certificate or by speaking to your installer - and all micro combined heat and power (CHP) installations. It may help you to know that the average home-scale PV installation is 4kW. If the capacity of your installation is more than 50kW, please go to our large installations page.

Additional ofgem scheme details can be found here.

How do I apply?

You will need a Microgeneration Certification Scheme (MCS) certification (or equivalent) if you want to receive FIT payments. For solar PV installations you will also need an Energy Performance Certificate (EPC) rated D or above and issued before you commission your installation to receive the highest FIT tariffs.

To apply, follow these steps:

1. Commission your installation

You must use an MCS-certified installer using MCS-certified equipment. Your installer will register your installation on the central MCS database and give you an MCS certificate.

2. Submit an application to your chosen energy supplier (we call this your FIT Licensee)

A full list of FIT licensees is available on our website.

3. Claim your FIT payments

Once your energy supplier accredits your application, they will make the FIT payments to you once a quarter.

What tariff will I receive?

The number of new installations that can receive support under the FIT scheme each month is capped – we call these deployment caps. Applications for small installations are queued by the date and time the MCS certificate was first issued.

The latest FIT queue information is available here.

The latest FIT tariff rates are available here.

Need help?

Your initial point of contact is the Energy Saving Trust. For England and Wales, please contact The Energy Saving Advice Service free on 0300 123 1234. For Scotland, please contact Home Energy Scotland free on 0808 808 2282.

If you would like more information on applying for FIT accreditation for a small installation, please see our small installations webpage or contact your energy supplier.

*All information and details published have been compiled with care. Nevertheless, no guarantee can be given that they are accurate or complete. The applicable laws, ordinances and directives are the only authoritative source – legally binding information is available from the institutions mentioned in each case. There is no legal entitlement to subsidies. Exceptions may arise from statutory regulations. Moreover, grants are always subject to the limits of available budgets from the respective granting agency.

Remote control of the fuel cell heating appliance via app

Using the Viessmann Vitotrol app, you can control your fuel cell heating system both at home and away from your tablet or smartphone. The app also shows you the latest data on power generation and heating operation. It allows you to keep an eye on your hydrogen heating system at all times!

Remote control of the fuel cell heating appliance: Vitovalor app