Hi, i am just curious how long your typical gravity fed indirect hot water cylinders last? The house was built in 1998 and for about a month now i have been hearing loud gurgling coming from the cylinder whenever the power shower is used this gurgling only happens briefly and doesn't affect the system in any way, the flow rates and pressure to all taps remain reasonable as far as gravity systems go. What could be causing the temporary gurgling? Also how long does the main cold water storage tank (plastic) generally last? I have never had any problems with the system and still don't but would like to know how long these systems generally last?
Thanks
Thanks