Few months back, I bought a house where indirect water heater (41 gallons Amtrol BoilerMate) is installed. All was fine until the casing developed 20+ inch crack. Water is not leaking so I guess for now I am just loosing efficiency. I had one person to come over to take a look at it and he recommended to replace it with regular (direct?) water heater. He told me that the current system will use the furnace even in the summertime to heat the water. Could somebody in layman's terms explain to me what are the advantages of indirect water heaters and if I should or should not replace it with regular water heater? I am asking because the Amtrol replacement is more than double the cost of regular water heater. Currently, our basement is nice and hot but I can imagine that in the summertime it is going to be an inferno in there with all the equipment working.