Gedo also struck twice while Robert Koren found the target once as the Tigers moved above Watford and into second place in the npower Championship. Birmingham scored late consolations through Peter Lovenkrands and Chris Burke, but it was Boyd who stood out and Bruce was not about to hold back on his assessment of the forward's performance.
"If there has been a better home debut, I haven't seen one for a long time. He was terrific from first to the last," Bruce said. "He's a good player. You can talk about tactics, formations and systems but this kid oozes ability."
He added: "He can play with anybody. He's a clever footballer. He's made the difference today at an important time."
Hull needed to get back to form after a humbling 4-1 loss at Bolton when they conceded three goals in the opening eight minutes. Here, Boyd - who is on an emergency loan from Peterborough - opened his Tigers account inside 60 seconds.
"The one thing you want is a response when you get beaten in the manner we did last week," Bruce said. "Last week was a bit of a fluke, we had a good response and scored some good goals.
"Birmingham made a couple of mistakes early on and I keep repeating myself, it's about who makes the least mistakes."
For Lee Clark's visiting side, errors were plentiful in a match he wants the players to forget.
"That's what I have said to them. Let me be down in the dumps on the bus journey home, let me analyse this stuff," Clark said.
"They just have to come in tomorrow, dust themselves down and be ready to go (against Blackpool) on Tuesday. It is a tough place to come and when you are 30 seconds in and 1-0 down to quite a simple goal it is a tough one."