For every £1 you wager on the American variants, the house benefits £0.053. This means the casino can make big gains from players in the long run. The addition of the double zero increased the house edge of this game to 5.25%. In the American roulette wheel, the edge is higher than in other variations. Simply put, a house edge is the advantage of the casino over players in a game. House Edge and RTP in Double Zero Roulette Wheel The double zero gave the casino a bigger advantage over players. While these roulette games follow the same gameplay rules, they vary in odds and house edge. The bets are placed on the roulette table with numbers and number groups. The game betting layout features a spinning wheel with numbered pockets where the ball lands to determine the winning number. The game's objective is the same as French roulette and the European wheel. The double zero roulette wheel is popular at the leading online casino sites in the USA. Types of Bets in Double Zero Roulette Wheel.House Edge and RTP in Double Zero Roulette Wheel.