Customer needs to replace indirect tank. Exsisting tank is not big enough for 11 apartments. We informed customer of this last time. Arrived and boiler was at temperature. Boiler fired up 5 times with out us hitting reset. All zones are hot including indirect. They are running out of hot water because tank is not big enough. Relief valve is dripping but with the amount of corrosion and rust on relief valve pipe, relief valve cannot be removed with out damaging piping. Customer should replace indirect as well as boiler.