Watford have won nine and lost just one of their last 14 home league games against Birmingham (D4 L1).
The Blues have only managed two clean sheets in 17 previous league games at Vicarage Road.
Watford have failed to score in six of their last eight league games at Vicarage Road, though they did score two in their last match at home.
The Hornets have kept three clean sheets in their last four at home in league competition.
The Blues have netted two or more goals in five of their last seven away league games (W5 D1 L1).