Vaillant ecoTEC Plus 836 36kW Combi Boiler - 0010036017+ Flue. Vaillant EcoTEC Plus 940 40KW Combi Boiler 0010036114. This will allow the boiler to reach a wider modulation range of up to 1:10 providing you with the ultimate efficiency, helping you to save energy and lower utility bills.
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