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    No big flames inside Vaillant VCW Sine 18T3WFH !!

    Moved into our house in Dec03. The boiler is a Vaillant VCW-Sine 18 T3 WF H 'combi' boiler which does heating and on-demand hot water. I was told by a plumber (CORGI) guy who called to connect our new cooker that this boiler is "a decent one". It has worked fine for months and now it seems to...