The high efficiency double act: Gas condensing boiler plus fuel cell

Combining a gas condensing boiler and fuel cell module in a single appliance reduces energy consumption by up to 40 percent compared to conventional gas condensing technology.

Against the backdrop of rising energy prices, decentralised power generation in detached and two-family houses is gaining in importance. For this reason, combined heat and power technology provides an alternative when using fuel cells: With the Vitovalor 300-P, Viessmann has brought an efficient solution for domestic energy supply to market: The heat generated as a by-product of power generation is used for central heating and DHW heating to save costs. The fuel cell heating appliance covers the complete heat demand and base load of the power demand in a detached or two-family house.

The Vitovalor 300-P consists of two units: a fuel cell module and a peak load module comprising an integral gas condensing boiler, heating water buffer cylinder and DHW cylinder, as well as all hydraulics, sensor technology and a control unit. The unit is compact, visually matched and requires a footprint of only 0.65 square metres.

Fuel cell heating system diagram

System diagram

[1] Fuel cell module
[2] Peak load boiler with DHW cylinder and heating water buffer cylinder
[3] Balanced flue system
[4] Integral electricity meter
[5] Communication interface
[6] Electricity meter (bi-directional)
[7] Domestic power circuit
[8] Public grid
[9] Internet
[10] Vitotrol app

Take advantage of these benefits

  • The fuel cell heating appliance allows for simultaneous generation of heat and power at home in detached or two-family houses
  • Peak load gas condensing boiler and fuel cell module are combined with DHW and heating water buffer cylinders, in a single unit
  • The coordinated and space saving compact design (only 0.65 m² of floor area) invite installation near the living space
  • The fuel cell module is characterised by high electrical efficiency of up to 37 % (Hi) and high overall efficiency [to DIN] of up to 90 % (Hi)
  • The gas condensing peak load boiler has a high standard efficiency [to DIN] up to 109 % (Hi).
  • The innovative, environmentally responsible technology of the future offers energy savings of up to 40 % and a reduction in CO2 emissions of up to 50 % compared to separate heat and power generation
  • Electricity costs can be reduced significantly with on-site power generation and consumption
  • Integrated metering technology is useful for public subsidy calculations and energy tax rebates for power, gas and heat [subject to local regulations]
  • The remote control or Vitotrol app make it easy to use and allows you to bring up current generation data at any time from any location
  • The Vitovalor 300-P has been awarded energy efficiency class A++
Vitovalor 300-P – the domestic fuel cell

Heat and power from a single source – the domestic fuel cell


Innovative combination

With 19 kW, the Vitovalor 300-P provides enough thermal output to cover the entire heat demand of a detached house. The maximum amount of electrical energy generated over the course of a day (15 kWh) is enough to satisfy the demands of the 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.

Efficient and environmentally responsible

The fuel cell operates with hydrogen and air, where the hydrogen is derived from natural gas in a process upstream of the stack (reformer). The heat generated as a by-product of power generation process is utilised efficiently for both DHW and central heating. The compact fuel cell heating appliance provides a household with heat, covers the entire electricity demand and, whilst doing so, saves up to 40 % energy, compared to conventional gas condensing technology. This technology creates greater independence from rising electricity prices and protects the environment at the same time, meaning that CO2 emissions can be reduced by up to 50 percent compared to conventional gas condensing technology.