@user3169 Sorry, the pans are metal, good-quality and thick. I do not know about the temperature maintenance while cooking as I keep the thermometer on rack during pre-heat and move it to side when I place the pans but the temperature seems to remain same.

@user3169 then how do I fix the issue of cake not browning on top?

@user3169 The aluminum foil is placed because in my gas oven there is a issue with top not browning and bottom getting browned faster. It was suggested in link

I did test it for doneness by poking a toothpick in the cake and it came out clean.

The brand is Skyline. I don't think its a international brand. The company does not say that 2.5 liters is required. I measured by pouring water till the minimum mark.