Gas boiler, Vaillant or Worcester?

14 Feb 2011
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United Kingdom
I am on the verge of placing an order for a 15kW open vent condensing gas
boiler, with vertical flue, and have narrowed the choice to the following:

Valliant ecoTEC plus 415 or Worcester Greenstar 15RI

Apparently the Valliant is a newer design but the Worcester (Bosch) has
better construction with superior service and warranty.

Any comments based on recent experience are welcomed and will be read with interest.
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