Viessmann 025 28 kW Combi Boiler Review |
Boiler Installation Birmingham
Real Installation Case Study – 3 Bed Home With Tado OpenTherm
If you are researching Viessmann boiler reviews and looking for real-world performance, this review is based on a recent Viessmann Vitodens 025 28 kW boiler installation we completed in Birmingham. The property was a typical three-bedroom house with one bathroom, radiators throughout and underfloor heating in the kitchen controlled through Tado smart thermostats using OpenTherm wiring.
We were first contacted for a boiler repair in Birmingham. Unfortunately, replacement parts for the customer’s old boiler were unavailable and, due to reliability concerns, a replacement was recommended. After researching Viessmann boiler reviews online, the customer selected the Vitodens 025 in the 28 kW output.
Why the 28 kW Model Was Chosen
For a three-bedroom, one-bathroom home, a 28 kW combi boiler provides reliable hot water output without oversizing. The Viessmann 025 28 kW delivers around 12 litres per minute at a 35°C rise, which is more than adequate for a household using the shower and hot taps daily.
The homeowner noticed stronger hot water flow immediately and more stable shower temperatures compared to the previous boiler.
OpenTherm Efficiency With Tado Smart Controls
We wired the Viessmann 025 using OpenTherm to unlock full modulation benefits:
- lower flow temperatures maintained without aggressive cycling
- improved room temperature stability
- reduced gas consumption potential
- ideal for underfloor heating which benefits from lower flow temperatures
This installation demonstrated how OpenTherm control provides smoother heat delivery than traditional on/off switching.
Value For Money and Five Year Warranty
The Viessmann 025 represents excellent value because it delivers features normally associated with higher-priced models:
- stainless steel heat exchanger
- efficient 1:5 modulation
- OpenTherm compatibility out of the box
- compact footprint
- strong domestic hot water performance
- five-year manufacturer warranty as standard
This provides reassurance for households looking to replace aging boilers cost-effectively.
Outperforming Other Boilers in its Price Range
Compared to similarly priced boilers such as the Worcester 2000, Vaillant ecoFIT Pure, and Ideal Logic Plus, the Viessmann 025 stands out for three key reasons:
Stainless Steel Heat Exchanger
Many rival boilers in this segment use aluminium exchangers that are less resistant to corrosion. Stainless steel improves efficiency retention and lifespan.
Superior Modulation and Efficiency
A 1:5 modulation ratio reduces cycling and fuel use, improving economy and comfort. Many competitors offer narrower modulation or less refined burner control.
Built-in OpenTherm Support
Several boilers require optional modules to use OpenTherm, increasing cost. The Viessmann supports it natively and integrates directly with systems such as Tado.
Job Summary
Property: 3 bed semi, one bathroom
Location: Birmingham
Heating system: Radiators throughout + underfloor heating in kitchen
Controls: Tado Smart Thermostat using OpenTherm wiring
Boiler Installed: Viessmann Vitodens 025 28 kW combi
Warranty: 5 year manufacturer warranty
Hot water performance: approx. 12 litres/min at 35°C rise
Post installation results:
- improved hot water flow performance
- quieter modulation
- more stable heating comfort
- reduced cycling for efficiency
Final Verdict – Viessmann 025 Review
For homes in Birmingham searching for Viessmann boiler reviews or reliable replacement options, the Viessmann Vitodens 025 28 kW stands out for affordability, modulation performance and stainless steel reliability. Combined with Tado OpenTherm smart control and supporting a mixed UFH and radiator system, the 025 delivered comfort and efficiency beyond what is typical for boilers in this price bracket.
For professional installation and advice, contact our experienced plumbers in Birmingham for expert guidance on choosing the right boiler for your property, or speak to us about a free quotation for boiler installation Birmingham.
