I have a 6 yeard old Weil-Mclain indirect-fired water heater.
A few weeks ago, I started to notice foul smelling hot water when taking a shower. One plumber told me that the source is bacteria inside the water tank and to clean it is a major project. (He didn't want to do it). Is it really that complicated. I always assumed that since the indirect heaters don't have coils, they can't get contaminated. Can someone advise me on this?
Thanks Johnny