I am purchasing a Weil McLein Ultra Oil American Ingenuity Ultra Result for my home. My question is regarding the vent. Should the vent be placed on the side of the house (straight pipe) or should the vent be placed thru the chimney. I have a white house and I am wondering if I will have any problems with stains from the oil. I heard that with a tankless oil burner the straight pipe should not be used on the side of the house. Please advise the best solution and also the pros and cons of each.