Boiler guide · 4 min read · Updated October 2026
Worcester Bosch vs Vaillant: the honest comparison
The two premium German-engineered brands compared on warranty, price and range — from someone who fits both.
Warranty head to head
- Worcester Bosch — Greenstar 4000: 7 years, extendable to 10; Greenstar 8000+: 8 years, extendable to 12
- Vaillant — ecoTEC plus: 5 years standard, extendable to 10; ecoFIT pure: 2 years standard, extendable to 10
- Both make the extended terms conditional on registration, filters and annual servicing
Price head to head
From our fitted catalogue: Worcester Bosch combis run £2,415–£3,845 fitted; Vaillant ecoTEC plus combis run £2,745–£4,285 fitted. Like-for-like, Worcester Bosch usually lands slightly cheaper at the same output.
The real differences
Vaillant's ecoTEC plus is the quieter, more refined unit and its ecoFIT pure is the value entry. Worcester Bosch has the deeper UK range and parts network, and the 8000+'s 12-year maximum is the longest cover we stock. Neither is a mistake — the wrong size or a poor installation is the mistake.
Our verdict
Tight budget with premium aspirations: Vaillant ecoFIT pure, provided the extended-warranty conditions are met. Best all-round: Greenstar 4000. Longest cover: Greenstar 8000+. We fit both and stock both — the quote builder prices them side by side.
Common questions
Is Vaillant better than Worcester Bosch?
They are the two strongest premium brands we fit. Vaillant edges refinement; Worcester Bosch edges range depth, parts network and maximum warranty length. The installation quality matters more than the choice between them.
Which is cheaper, Vaillant or Worcester Bosch?
In our fitted catalogue, Worcester Bosch lands slightly cheaper at equivalent outputs — £2,415–£3,845 versus £2,745–£4,285 fitted.
Ready for a real price?
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