Viessmann introduced the Vitovolt 300 solar PV system to the UK on 16 March 2023, describing it as a modular package of accessories that fit together with its heating and charging products1. The company said the range is covered by a 15-year product guarantee and full manufacturer support1.
The modules are monocrystalline, with an output of up to 440 Wp guaranteed for up to 25 years, and module efficiency of up to 21.3%1. Viessmann said all modules are supplied with positive output tolerances, so output will never be lower than specified but could be up to +5 Wp1. The panels have a black anodised frame, dark cells and a black Tedlar foil, and the company lists detached houses, apartment buildings and commercial and industrial premises as suitable roofs1.
Viessmann gave figures for a typical installation. A typical Vitovolt 300 package provides a photovoltaic output of 4 kWp, producing around 3,800 kWh per year, which it said is well over the typical annual UK four-person household consumption level of 2,900 kWh, according to Ofgem1. Combined with a battery, EV charger and heat pump, where 100% of self-generated power can be used by the household, Viessmann said a system this size can generate an annual electricity saving of around £1,140, bringing a return on investment for the solar PV system of around ten years1. Larger packages are said to offer greater savings1. These are the company's own projections; no independent verification of the savings or payback figure is given in the announcement1.
Storage can be added through a Viessmann-offered BYD Battery Box Premium, with power flows of the PV and battery system monitored through Viessmann's Energy Management System1. All elements are controlled via the Viessmann One Base platform, which through the ViCare app allows customers to view and optimise use of self-generated energy for domestic electricity consumption, storage, heat or mobility1. Viessmann said the package is quick to install thanks to plug-in solutions for electrical connections and fully wired matching components1.
"Recent increases in energy prices mean the financial case for solar is stronger than ever before. Plus, we're using electricity more and more for heating and charging vehicles."
Why it matters for households
The launch is a pitch for a single-supplier route to home energy independence: generation, storage, heating and vehicle charging bought as one connected system rather than assembled from separate brands. For a household weighing up solar PV, the practical questions are whether the modules, inverter and any battery storage work together without compatibility problems, and what the warranty covers across the whole set rather than individual parts. Viessmann's answer is a 15-year product guarantee across all elements of the package and one control platform1.
The claimed economics rest on self-consumption. The £1,140 annual saving applies where a battery, EV charger and heat pump are all present and 100% of self-generated power is used in the home; a solar-only installation, or one exporting most of its output, would not match that figure1. The 3,800 kWh annual yield for a 4 kWp system is a company estimate and will vary with roof orientation, shading and location, none of which the announcement addresses1. Households comparing quotes may also want to look at how hybrid inverters and other manufacturers fit into the same picture, since the Vitovolt 300 is designed to sit within Viessmann's own ecosystem1.
What happens next
No installation dates, pricing, availability schedule or accredited installer details for the Vitovolt 300 were given in the announcement1.
Sources1 cited
- Viessmann launches Vitovolt 300 | Solar PV | Viessmann UK, viessmann.co.uk