Haaland took his season tally to 31 goals in 26 appearances for City, clinching three points after a difficult recent period for the champions.
The hat-trick was the Norwegian’s fourth treble of the campaign, while it brought up his 25th league goal this term, which is more than last season’s equal top scorers Mohamed Salah and Son Heung-Min (23).
“The numbers are incredible,” Guardiola told reporters. “He lives 24 hours for his profession, job, passion, love.
“He’s not stressed much when it’s going well or going bad. He is stable. He feels the defeats. It’s really good.
“He is not a player who will take the ball 10 metres behind the box. It is not his ability.
“He has to get the balls being delivered as much as possible from the fantastic players around him.
“The first goal is because he’s there. The delivery from Kevin (De Bruyne) is fantastic. Always I believe. We know each other.
“Listen, when we lost the competition (Community Shield) against Liverpool, all the debate (in the) week, 10 days before West Ham, is he will not adapt to the Premier League.
“When he played and scored, I don’t know many goals, he is the solution and everything of the team and when he does not score, he is the problem in our team. This is a great vision of these kind of things.
“We know his quality. We know each other. He is not a player to be dropped. We can’t play the false 9 with him. You have to adapt some movements with him. And we are doing quite well.
“The numbers are quite similar when we were champions many years here, except the season (we got) 100 points. So, we are there. Getting to improve, improve, improve. This is what we have to do.”