Smelly water from indirect-fired water heater

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
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Johnny Thunders Jr. wrote:

Is this on a well system?
If so, iron bacteria can make foul odors, particularly in heated water.
You'd have to open the piping *somewhere* to add dilute bleach to the section passing thru the boiler for the domestic hot water. You're in a better position to detrmine where/how.
Jim
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Johnny Thunders Jr. wrote:

Other than speedy Jims suggestion, replace the zinc anode with an aluminum anode. That will cure the smelly rotten egg smell.
J
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