Tom Cleverley was able to poke home Ken Sema's cross after some good work from Ismaila Sarr on the right hand side.
Daniel Bachmann was forced into a number of fantastic saves to preserve Watford’s lead, as the win fired the Hornets to the top of the Championship.
Burnley are still adapting to life under Vincent Kompany, who will be disappointed that his side could not come away with at least a point at Vicarage Road.
Here are five things learnt from Watford 1-0 Burnley.
Hamza Choudhury will be a vital player for Watford this season
Having signed on loan from Leicester City last week, Choudhury showed off his quality in the middle of the park against Burnley.
His 93% pass completion rate was impressive, but it was his ability to win the ball back that really took him into the hearts of Watford fans. Choudhury completed four duels from a possible five, made two interceptions and completed eight ball recoveries.
Watford’s midfield looked slightly unbalanced during their opening games against Sheffield United and West Brom, but the addition of Choudhury revolutionised the way the midfield played.
There is no doubt that if he can stay fit, he will be vital for Watford this season.
Vincent Kompany’s Burnley are still learning
Vincent Kompany’s appointment as Burnley’s manager marked the start of a new era for the Clarets.
Following Sean Dyche’s departure, Kompany will offer Burnley a new style of play, particularly in possession and going forward.
The opening three games have been a mixed bag, following a win, a draw and a defeat and it is clear that Burnley are still learning and adapting under the Belgian.
Despite having lots of the ball, it will take time for them to get used to patterns of play both in possession and going forward. It was clear for all to see last night that both Kompany and his players are still learning about the best way to succeed tactically.
Daniel Bachmann proving the doubters wrong
It came as a surprise to some Watford fans that Rob Edwards selected Daniel Bachmann over the new signing, Maduka Okoye.
However, Bachmann has started the season superbly, with some outstanding performances against West Brom and Burnley.
He made a number of crucial saves, most notably from Josh Brownhill’s free-kick after Hassane Kamara’s red card.
If this form continues, it will prove to be a career defining season for Bachmann, where he will be able to really make his mark on this Watford side going forward.
Is Ashley Barnes still good enough for Burnley?
Ashley Barnes has started the season with zero goals and just one shot on target from his first three games.
The experienced attacker was given the trust of Vincent Kompany, however he struggled again against Watford and was eventually taken off during the second period.
He appeared to be static on multiple occasions and struggled against Craig Cathcart and Francisco Sierralta.
Burnley may look at a replacement striker during the remainder of the transfer window, as Barnes may not be good enough at this moment in time for the Clarets.
Watford can survive without Dennis
With Emmanuel Dennis’ move to Nottingham Forest imminent according to Fabrizio Romano, some Watford fans have worried about how the Hornets may cope without their star man in attack.
Last night proved though that they can look just as threatening without the Nigerian striker. The final ball was sometimes questionable, but Watford’s attack proved to be a handful for the Burnley defenders throughout the evening.
Now that Keinan Davis has signed on loan from Aston Villa, along with the supporting acts of Joao Pedro, Ken Sema and Ismaila Sarr, Watford still have plenty of firepower going forward. They will certainly cause many Championship teams a myriad of problems this season.