Viessmann Vitodens 025-W Combi Boiler – High-Efficiency Gas Condensing Boiler (24 kW and 28 kW Models)

The Viessmann Vitodens 025-W is a compact, efficient and reliable gas condensing combi boiler designed for modern homes. Using Viessmann’s proven Inox-Radial stainless steel heat exchanger and the advanced MatriX-Plus burner, the boiler delivers strong performance, low running noise and long-term durability.

Available in 24 kW and 28 kW versions, the range suits apartments and small to medium homes that require dependable heating and good hot water output. Its slim, wall-mounted design makes it ideal for replacement installations where space is limited. The unit arrives pre-commissioned to speed up installation and reduce on-site setup time.

Vitodens 025-W Brochure Dec (1)

Available Models

Vitodens 025-W 24 kW Combi Boiler

• Central heating output: 5 to 20 kW

• Domestic hot water output: 24 kW

• Flow rate (ΔT 35°C): approx. 10 litres per minute

• Suitable for: 1–3 bedroom homes with one bathroom

Vitodens 025-W 28 kW Combi Boiler

• Central heating output: 5 to 25 kW

• Domestic hot water output: 28 kW

• Flow rate (ΔT 35°C): approx. 12 litres per minute

• Suitable for: 2–4 bedroom homes with one to two bathrooms

Key Features

• High-efficiency gas condensing combi boiler

• Stainless steel Inox-Radial heat exchanger for long service life

• MatriX-Plus burner for clean, efficient and quiet combustion

• Compact dimensions for tight cupboard or kitchen installations

• Simple LCD display with four-button operation

• Low operating noise

• Pre-commissioned for faster installation

• Weather compensation and OpenTherm compatible

• 5-year warranty when registered on Viessmann’s portal

• Energy Efficiency Class A

Technical Specifications

Heating output range:
– 24 kW model: 5–20 kW
– 28 kW model: 5–25 kW

DHW performance: 24–28 kW
Flow rates: 10–12 LPM depending on model
Modulation ratio: 1:5
ErP space heating efficiency: 92 percent
Dimensions: 700 × 400 × 300 mm
Weight: 34 kg
Flue connections: 60/100 mm concentric

Viessmann 025-W Brochure