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Assess First. Recommend Second.

Viessmann Vitodens Classic / 025-W Combi

Two compact combi output choices, with straightforward LCD operation.

Viessmann Vitodens Classic / 025-W Combi boiler
Manufacturer warranty optionsUp to 5 years

For qualifying models and registration packages. Annual servicing required.

Your written quotation confirms the cover included. Extensions may be chargeable. Badges in the product image are subject to these conditions.

Warranty eligibility & conditions

Up to 5 years whole-boiler cover when registered via VPlus. The separately advertised 10-year heat-exchanger warranty covers that component and must not be represented as 10-year whole-boiler cover. Subject to current manufacturer terms, model and installation eligibility, installer registration/status, correct commissioning and annual servicing. Registration deadlines and any qualifying controls, accessories or system-water requirements must be confirmed. The written quotation confirms actual cover; maximum cover is not automatic.

Manufacturer warranty information
Official Vitodens Classic / 025-W Combi product image.

At a glance

Fuel and boiler type
Natural gas · Combi
Output options
24 kW | 28 kW
UK range position
Listed in the current Viessmann UK directory and linked UK literature; exact generation and supply availability confirmed before quotation.
Warranty eligibility
Up to 5 years, subject to model, registration route, qualifying installation and current manufacturer terms; extensions may be chargeable.

How this arrangement works

Two compact combi output choices, with straightforward LCD operation.

Heating and hot-water output options

Natural-gas figures. CH at 80/60°C; condensing CH at 50/30°C. Output label, heating maximum and hot-water rating describe different functions.

Vitodens Classic / 025-W Combi — verified output options
Model / output optionHeating at 80/60°CHeating at 50/30°CHot-water outputFlow at 35°C rise
24 kW option · 709827819.2 kW21.2 kW24 kW10 l/min
28 kW option · 709827922.7 kW25 kW28 kW12 l/min

The June 2026 UK guide lists the same two product codes under Classic and 025-W. Both names are covered here without double-counting the hardware.

No integrated WiFi or ViCare control is promised for this platform.

Key benefits

Stainless-steel Inox-Radial heat exchanger, MatriX-Plus burner and a high-efficiency circulation pump. The UK guide identifies volt-free, OpenTherm and optional weather-compensated control routes.

Key takeaway

A simpler controls platform for assessed combi replacements. Check water supply and simultaneous use; the 24/28 labels are hot-water ratings, not the heating load.

Warranty and registration conditions

Up to 5 years whole-boiler cover when registered via VPlus. The separately advertised 10-year heat-exchanger warranty covers that component and must not be represented as 10-year whole-boiler cover. Subject to current manufacturer terms, model and installation eligibility, installer registration/status, correct commissioning and annual servicing. Registration deadlines and any qualifying controls, accessories or system-water requirements must be confirmed. The written quotation confirms actual cover; maximum cover is not automatic.

Manufacturer model and warranty information · Registration terms and warranty table

Controls and installation planning

The UK guide lists volt-free, OpenTherm and optional weather compensation, with no integrated WiFi or end-user app. Confirm wiring and outdoor-sensor requirements for the exact appliance; do not apply 230 V to a volt-free connection.

Casing: 700 mm high × 400 mm wide × 300 mm deep. Flue, pipework and installation/service clearances are additional and require the selected model manual.

Continue your assessment

The Boiler Finder can link to this family as an initial research option. It does not rank manufacturers, select a precise kW variant or replace a heating survey.

Combi arrangement guidance

Model questions

How should I compare Vitodens Classic / 025-W Combi outputs?

Read the rating basis alongside the table. Heating, hot-water output and storage delivery describe different duties. Boiler labels and bedroom counts are not substitutes for calculated heat loss and measured water supply.

What warranty applies to Vitodens Classic / 025-W Combi?

Up to 5 years whole-boiler cover when registered via VPlus. The separately advertised 10-year heat-exchanger warranty covers that component and must not be represented as 10-year whole-boiler cover. Subject to current manufacturer terms, model and installation eligibility, installer registration/status, correct commissioning and annual servicing. Registration deadlines and any qualifying controls, accessories or system-water requirements must be confirmed. The written quotation confirms actual cover; maximum cover is not automatic.

What should be assessed before choosing Vitodens Classic / 025-W Combi?

A simpler controls platform for assessed combi replacements. Check water supply and simultaneous use; the 24/28 labels are hot-water ratings, not the heating load. Final specification requires professional assessment.

Manufacturer evidence

UK directory and linked manufacturer literature checked 2 October 2026. Exact generation, availability and current warranty entitlement are reconfirmed before quotation. Where manufacturer documents conflict, the chosen rating basis and remaining checks are stated above.

Installation and pricing

The installed price for your selected boiler is confirmed after assessment. The quotation covers the appliance, controls, flue, system preparation and any required pipework. A conversion or relocation can have a different scope from a straightforward replacement.

SwiftHeat’s general starting package

New boiler installations from £1,790 inc. VAT apply to a qualifying standard, straightforward replacement: one bathroom, fewer than 10 radiators and a standard horizontal flue, subject to survey. Specification and warranty selection affect the final cost. This is a general starting offer and is not a price for every model in this catalogue.

Read the starting-package conditions

Humm finance

0% options over 3, 6, 9 or 12 months through Humm Group Limited, subject to application, affordability, eligibility, approval and provider terms. Any applicable deposit, fees and repayment conditions are confirmed during your enquiry/application. Acceptance is not guaranteed.

Finance terms and charges

Qualifying Care+ installations

Two free annual services and a Hive Mini are available on qualifying installations only. Every model is considered under the qualification rules; inclusion in this catalogue does not confirm eligibility. Ask us to confirm the offer in your quotation.

Ask about Care+ eligibility

Ongoing support

Plan the maintenance your appliance requires and keep its service records. If you are considering replacement because of a fault, diagnosis can help establish whether repair is a suitable option first.

Boiler servicing · Repair advice

Installation pricing

Price confirmed following assessment for this configuration. The general New boiler installations from £1,790 inc. VAT offer does not apply to every model or property.

From or indicative prices remain provisional. SwiftHeat issues a written fixed quotation for the agreed scope after the appropriate property and installation assessment, technical checks and warranty-package verification. Remote information gathering may be suitable initially; a home survey is required where the necessary checks cannot be completed remotely.

Your home comes first

We assess heat loss, heating and hot-water requirements, water supply, controls and installation access before recommending an appliance. Bedroom count or a catalogue model number alone cannot establish the right boiler.

Gas Safe registration 978273 · Serving Cardiff, South Wales and across the UK.

Understand suitable boiler types · Start the Boiler Finder · Our installation assessment · Areas we cover