Viessmann announced on 12 December 2023 that it has added a new 35 kW output model to its Vitodens 050-W range of gas-fired combi boilers1. The company said the new model provides domestic hot water (DHW) output from 2.9 to 35 kW and heating output from 3.2 to 32 kW, with a modulation range of 1:10 for increased seasonal efficiency1.
The boiler carries an ERP efficiency rating of 92% (Class A), which Viessmann attributes to its MatriX-Plus burner with Lambda Pro combustion-control system1. It is certified for a blend of 20% hydrogen and for flue runs of up to 20 metres for horizontal and vertical flue systems1. The 050-W was launched in the UK in 20151.
WiFi is built in, allowing commissioning through Viessmann's ViGuide Mobile app and homeowner control through the ViCare app1. Weather compensation can be added with an outdoor sensor, as the circuit board already carries the software for it, and the boiler can connect to the ViCare app even when installed with third party controls1.
Darren McMahon, Viessmann marketing director, said:
"The new higher output and increased flow rate offer a very attractive boiler at a mass-market price, for installers and customers looking for Viessmann quality and reliability, and offer increased hot water comfort for one-bathroom properties."
The Vitodens 050-W comes with a three-year guarantee as standard, increasing to seven years if fitted by a Viessmann-trained installer and registered on the Viessmann Installer Portal, with an option to increase to 10 years1. The announcement did not give a price for the new model, and no efficiency figures for the other output models in the range were reported1.
| Item | Figure |
|---|---|
| DHW output | 2.9 to 35 kW |
| Heating output | 3.2 to 32 kW |
| Modulation range | 1:10 |
| ERP efficiency rating | 92% (Class A) |
| Hydrogen blend certification | 20% |
| Flue length | up to 20 metres |
| Guarantee | three years standard, seven years with trained installer, option to 10 years |
Why it matters for households
A combi boiler's output sets how much hot water it can deliver at once, so a higher-output model in a range matters most to homes where hot water demand is concentrated, such as one-bathroom properties with a strong mains supply1. Viessmann's own framing of the model is that it offers increased hot water comfort for one-bathroom properties and suits both specification and retrofit installations1.
For a household weighing up a replacement, the details that bear on running costs and future options are the modulation range, which describes how far the boiler can turn down its output rather than cycling on and off, and the weather compensation capability, which adjusts flow temperature to outdoor conditions1. Both are present here, with weather compensation requiring an added outdoor sensor1. The 20% hydrogen blend certification indicates the appliance is certified to run on a blended gas supply at that proportion, not on pure hydrogen1.
The guarantee length depends on who fits the boiler and whether the installation is registered, so the terms attached to a given installation vary1. No running-cost figures, price or efficiency comparison against other models in the Viessmann range were reported1.
What happens next
No launch date for the 35 kW model beyond the 12 December 2023 announcement, and no pricing, were reported1.
Sources1 cited
- Vitodens 050 now available as 35 kW | Combi | Viessmann UK, viessmann.co.uk