The shop is very small and if you come during the peak hours of 12 noon - 1:30 pm, the place is usually packed. Eating inside is cooler than outside as it's air-conditioned. But watch out for the slippery floor though. Just in case you don't know the process at YHK, they are semi self service restaurant. You order what you want at the front of the restaurant, tell them your table number and then wait for the food to arrive.
Yong Tow Foo is served in the afternoon, while they operate a steamboat dinner at night.