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Viessmann

Vitodens 100-W 30kW Combi

House Verdict
8.9/10
★★★★★

Viessmann's mass-market combi brings the brand's quiet condensing operation down to a price tier where it competes with Worcester and Vaillant. The build quality is unmistakable on the first morning the system fires up and the native controls are a generation ahead of the British rivals.

ErP
A-rated
Running cost
£1,080/yr
Installed
£2,500 to £3,100 installed
Best for
Quiet kitchen installsHeat-pump-ready householdsConsidered upgrades
Sleek white wall-mounted combi boiler in a clean modern kitchen alcove with stone-coloured cabinetry.

Editorial render. Not a manufacturer photograph; we do not redistribute press imagery without a licence.

Primary question · Is the Vitodens 100-W the considered alternative to the Worcester default?

The five questions
Is this right for me?

Households replacing a tired combi who want a quieter, better-built boiler without paying for the Vitodens 200 tier.

What will it cost?

£2,500 to £3,100 installed

Advantages
  • Genuinely quiet at low fire
  • Best build quality in the price tier
  • Native controls feel considered
Trade-offs
  • Service network is thinner outside cities
  • Filter and condensate fittings cost more than the British rivals
What to do next

Open the cost planner to estimate your installed price.

Key specifications

Output
30 kW heating, 30 kW hot water
ErP
A-rated
Hot water flow
12.8 L/min at 35°C rise
Warranty
10 years (registered installer)
Perfect for
Households replacing a tired combi who want a quieter, better-built boiler without paying for the Vitodens 200 tier.
Avoid if
Your installer doesn't have Viessmann in their service rotation; brand familiarity matters for warranty handling.
What we like
  • , Genuinely quiet at low fire
  • , Best build quality in the price tier
  • , Native controls feel considered
What we don't
  • , Service network is thinner outside cities
  • , Filter and condensate fittings cost more than the British rivals
House Verdict · Confidence: high
★★★★★
Worth considering instead
House Summary

If your brief matches "households replacing a tired combi who want a quieter, better-built boiler without paying for the vitodens 200 tier.", the Vitodens 100-W 30kW Combi is a confident pick. If it doesn't, the alternatives above are more honest answers.

Related decisions
Next Step

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